Diesel Engine Runs Rough When Warm

Stalling When Climbing on One Side Diesel Fuel Return line Kinked. Only when engine is has been running and I leave it off for about 5 to 10 minutes does it have a hard time starting. It runs good with choke about 1/3 on. Later in the afternoon, when leaving work (the car had been stood for over 8 hours), the ambient temperature was around 20 degrees Celsius, and the car took several minutes to fire up, with around 5 attempts with the starter motor for between 5 and 10 seconds per attempt. This clogged EGR valve causes the engine to run badly due to an imbalance in the fuel/air mixture. engine starts, runs rough, stumbles, dies and won' t start It fired up when i bought it, enough to get it off the trailer. ) in nature. upon start up it would smoke quite a bit and would idle rough and about after 30 sec it would clear up just yesterday i let the grid heater heat up the motor and started and had no issues at all, thats when my truck would run bad, when i let the grid heater warm the motor. Rough Idle/Engine Hesitation when engine hot was created by 96Pontiac Okay so I looked around on the forums both for the codes I have and my problem my 1996 Pontiac Grand Am (2. By the time I backed out of the driveway the check engine light came on. 0L Power Stroke & Performance Add-ons A large portion of the 6 liters that have major problems have been modified. let it warm up and the. 7 Powerstroke to discuss items that you should look out for and expect to deal with over time. 6L Duramax diesel engine & associated components. I had a few 7. The better you know your diesel engine the better mechanical service and repairs we can provide. Dirty Fuel Injector Modern vehicles are fitted with fuel injection systems, which inject fuel into the cylinders to create a mix of air and fuel to burn. 0L Ford E-350, E-450, E-550 series vehicles equipped with a 6. until the engine warms up. Since the car was at a complete stop whole night, the engine oil temperature falls below its operating range. Learn more about Chevrolet Equinox at the Edmunds. once the turbo catches up the power comes back. Is your car running rough, engine shakes, and the catalytic converter seems too hot? Your check engine light may also be on with a misfire code. The white smoke is unburned fuel, that is caused by a cold engine. A Diesel running rough but not flagging any fault codes is generally fuel related, i. If it starts easily and runs strong, I don't think there's anything wrong. My engine appears to start up perfectly when it finally starts. Excessive use of starting fluid in any engine can easily cause cracked pistons and even heads among other things. 3 Powertroke, 6. It has a rough idle when cold but will run after it gets warm. 3 runs rough when warm PLEASE HELP - HI Everyone, new to the forum have heard great things I hope someone can help me or point in the right direction thanks in advance for any help. 9L Cummins Engine: 4BT Diesel Pros & Cons. 3 liter 4x4 137k miles. Components also get very warm and could heat the inlet air temp sensor to engine temps rather than air temps. I had a fuel filter plug up on a diesel truck I had, it still ran okay but way down on power. 9 Cummins? What you will find on all the Cummins equipped trucks since 2003, when the electric solenoid type injectors were introduced, is a tendency to build up soft desposits on the injector tips. Run the engine speed up to the occurrence of the misfiring. POWERSTROKECUSTOMS. when i put it in park or nuetral it idle up but it still lopes. You'll be amazed, just like we were, at the condition of critical components. Runs great when engine is cold. The inlet air temp sender will delay a bit to change the temp reading resulting in an a lumpy idle until it does. Josh on Jul 30, 2008. Weighing in at nearly. Find Hansen first started working on a Diesel engine in 1995. In an overhead cam engine, the camshaft lobes themselves depresses the valve while in single cam engines, the cam actuates push rods that open the valves by moving a lever called the rocker arm. Also note if it happens when the engine is cold, warm, or both. I set the timing on the cold engine and it ran very smooth. If a valve spring has broken or a cam lobe has worn down, it will cause the engine to misfire and run rough due to the loss of compression. A slightly damaged P&B assembly can, occasionally cause a rough running when HOT…since the thinner/hotter diesel. ) in nature. I wonder if going to 10W30 for me would help on that. Engine runs rough on cold start warm ok without more details about your truck it's hard to give you a reliable diagnosis. Reader Question. Highly Highly recommended. I checked and fixed the under valve cover connections but they came back. issue: some 2004-2005 f150 & 2005 f250-f350. Even in warm, but not hot, weather, if I let the truck sit and idle in park for 10-15 minutes, it seams to get "hot" and will start the rough idle. If it starts easily and runs strong, I don't think there's anything wrong. Everything went pretty well until the very end. Recently (and I think it is getting worse with time) the engine runs quite rough when first started up from cold. A faulty sensor (or sensor circuit) will often cause cold driveability and emission problems. Older vehicle engine limp home modes. Is there a small silver ignitor on top of the motor? It has a black wire going into it. Let me use an idle complaint that had me on the ropes as an example. I have a '97 PSD and it idles a little rough when warmed up. After performing the check in the troubleshooting section and your engine is still not performing correctly, contact your John Deere. 0 Liter Diesel Engines The VT365, also known as the 6. I reset the ECU, and now the car runs rough! Why? The engine may run rough or idle poorly right after ECU reset. When the fuel heats up sufficiently, my problematic speed tachometer sensor would act up and send the wrong signal to the ECU. See why changing your filters, fluids, and warming your engine up can add to a long service life. 0 Powerstroke, 6. What causes a rough idle? A rough idle can be caused by many different car faults. A valve adjustment (on engines up to 1885) followed by a compression test must be done first. We pride ourselves on our world wide product support. 1999 - 2003 7. Ok here it goes. 0 AWD, and I read almost all the negative responses in this thread. 0L Ford diesel engine may experience no starts, hard starts or rough running when cold and may be accompanied with diagnostic trouble codes (DTCs) P0611, P1378 and/ or all 8. The advice and opinions given are not intended to be a full diagnostic guide and should not get used as such. If you see your vehicle's temperature gauge creeping into the hot zone, try not to panic. A valve adjustment (on engines up to 1885) followed by a compression test must be done first. 5 turbo diesel engine and runs bad on idle speeds up the engine and then almost dies over and over. It cannot even be driven out of the parking lot. My Engine Runs Rough When It Gets Hot But Ok When Cold. Thanks so much for your patience with me and expert advice. I own a Chevy S10 and have my friends here that is the 2001 version and it has the plastic intake air set up on it, it is a 2. It clears up after about 5 minutes of driving. This uncommanded uncontrollable condition is called stiction. The engine may continue to run even though the ignition has been turned off because the combustion chamber is hot enough for spontaneous ignition. Average repair cost is $460 at 54,750 miles. I did the blow test on the hose and it held but with a vacuum pump it was clear it would not hold. 5 Diesel or GM 6. If the truck runs rough when it's cold but clears up when the engine is warm, you have a stiction issue in your injectors. The PCM communicates to the Fuel Injection Control Module (FICM) that it’s time to fire the injector. After work, about half way home at 2:30 am Mar 17, the engine did the same thing as the day before, ran really rough like it wasn't firing on all cylinders. Take it for a ride and it runs great and doesnt smoke at all. could be 2-3 times the same day or after 2000 miles. I have a '97 PSD and it idles a little rough when warmed up. THP engine naming, maintenance and servicing – 101. ) Running winter fuel in warm weather. The fuel burns and powers the car. As the weather warms up, this is rarely a problem. Then, after about 1/2 hour it starts losing power and in a period of about 3-4 minutes it loses so much power that it can't climb a small grade unless I drop it into 1st gear. This kit will fit all 115, 116, 123 and 126 body Mercedes with the diesel engine. * Valves out of adjustment (OM615, OM616, OM617 and all earlier diesel engines). 3L Powerstroke Diesel by DFUSER. Cold start it hunts for idle speed, I give it a little gas for about a min and then it idle steady but rough. could this cause it?. Sometimes, vacuum lines cause a rough idle due to a vacuum leak, and these lines are also simple to replace. No rough idle or rough running, engine seems to be running smoothly. The ECU now has default numbers in its trim memory - it has to adjust them to match the tune of your engine and its sensors and actuators. We hope this guide will help extend your engine’s life. 4l) seems to be having, and I couldn't really find any definitive answers. after it runs a little bit it is fine again. , engine running 3,500 psi. Perkins has a wealth of knowledge about diesel engines amassed through 85 years of research, development and testing of its own models. See why changing your filters, fluids, and warming your engine up can add to a long service life. Even if I break the law and go up to 60mph (revs at 2000) it stays the same. Reader Question. 3s come in last month that would run rough at random times. At any RPM other than idle it also sounds and feels normal. 0L Ford diesel engine may experience no starts, hard starts or rough running when cold and may be accompanied with diagnostic trouble codes (DTCs) P0611, P1378 and/ or all 8. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. Now the truck starts up and blows white smoke and runs like it is running on 3 cylinders for about 30 seconds then it clears up and runs smooth until the engine gets to about 1000 rpm then it starts blowing white smoke and runs rough again. got new plugs ,wires and. A service kit is available for the MaxxForce DT diesel engines that allows mechanics to disassemble the low pressure and high pressure turbocharger on the compressor side (intake) and remove the soot buildup. What are the. This allows oil to leak into the combustion chamber. If the engine is misfiring, call Detroit Diesel Technical Service Group. Hey guys, been having problems with my 2005 duramax. I have put on over 1000 miles on it since and no codes and no rough idling. Rough idle, especially hot: Could be caused by anti-foaming agent depletion, incorrect oil, or leak at the oil pump pickup tube. Ford Superdutys with Powerstrokes are generally great, robust trucks, but they do have their problems. Make sure the choke operates by opening slowly during normal engine warm-up. run fine till i let off gas to stop or turn then it dies but can start the engine again with no problem and it will run till i let off gas again. When idling warm it is very rough, periodic vibration that feels like it is stalling. CarComplaints. To put it another way, a 20hp engine at cruising revs is chuffing its way through a cubic metre of air every minute. It clears up at higher throttle and improves when the engine is warm. The hot post also arcs fire. If your GM 6. This clogged EGR valve causes the engine to run badly due to an imbalance in the fuel/air mixture. So the more electrical load you put on it the higher the idle goes. The glue on the elbow near the TBI turned to liquid when the engine got warm and the hose would not hold a vacuum. See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. truck runs rough when it warms up 11 Answers. You can rev the engine hard and it is smooth as it should be and you can drive it as normal. Runs great when engine is cold. It's got to be able to breathe in, and breathe out, and any restriction in either direction may result in rough running, loss of power, and black smoke. Start the engine. White Smoke, Lack of Power, Exhaust Odor, Surge, Runs Rough, or No Start: The above symptoms on trucks equiped with the 6. Detection Item DTC Detection Condition Trouble Area MIL Memory; P1605: Rough Idling: When the accelerator pedal is fully closed and the engine is idling, the speed of a specific cylinder is low for 2 to 10 seconds. Once the engine warmed up, it would sputter a bit and run rough, occasionally slowing down almost to idle, cough for a few more seconds, and then run back up to full throttle (or whatever the throttle was set at). However, we can't see how much smoke you are seeing. I only use diesel fuel but in cold temperatures the diesel will gel and either not move at all and the engine will not run or move slow and engine will run rough. Now the truck starts up and blows white smoke and runs like it is running on 3 cylinders for about 30 seconds then it clears up and runs smooth until the engine gets to about 1000 rpm then it starts blowing white smoke and runs rough again. Your valves have to open and close once for every 2 times your engine spins around. 5 Diesel can exhibit one, a few. i had an OBD code that is my cam positioning sensor. See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. 3 IDI TURBO DIESEL LONG BLOCK ENGINE. 5 Turbo Diesel stalls or is stalling, quitting, dies, idles rough, surges in reverse, surges, hesitates or is hard to start, any ONE or more of these are common symptoms of PMD/FSD failure, your 6. SYMPTOM SUMMARY The engine idles too high. However, we can't see how much smoke you are seeing. Not sure if this is a clogged fuel line, carburetor or something else going on. Every now and then it'll run a little lumpy but then would be fine again (once a week at most). When the engine is newly started the air the gets compressed also gets a little cooled by the still-cold engine block, so the ignition is a little delayed and the engine runs rougher. Learn more about Chevrolet Equinox at the Edmunds. 9L Cummins Engine: 4BT Diesel Pros & Cons. If I let the truck sit and cool off, it runs well again until it warms up. Allow the engine to warm up to operating temperature. When the second one on #6 went then it idled rough. Nor did any single engine do more to kill GM. I have a 03 walker 26hp efi just bought used, it cranks and idles great and the blades come on great. Dirty Fuel Injector Modern vehicles are fitted with fuel injection systems, which inject fuel into the cylinders to create a mix of air and fuel to burn. This condition usually occurs when the vehicle is cold and the oil is thick. The short shut down periods are OK, as the sensor has not started to detect a slight drop in engine temperature yet. If a Ford F250 runs rough until it warms up what could be the problem? Injectors or Glow Plugs? diesel and gas. Rough Idle/Engine Hesitation when engine hot was created by 96Pontiac Okay so I looked around on the forums both for the codes I have and my problem my 1996 Pontiac Grand Am (2. 0L diesel engine may experience no starts,non-factory installed), and hot and cold hard starts or rough running when cold and may betemperatures can also put additional requirements accompanied with diagnostic trouble codes (DTCs)on the vehicles electrical, battery and charging P0611, P1378 and / or all 8 injector circuit codes. could be 2-3 times the same day or after 2000 miles. It does have to warm up for a few minutes or it has very little throttle response. And from there on it doesnt smoke. On this episode we reveal a common source of faults that can cause a rough idle or at times a stalling condition, and how to easily diagnose. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. EPA07 SERIES 60 ENGINE OPERATOR'S MANUAL INTRODUCTION This guide is intended for use by the operator of a Detroit Diesel Series 60 engine used in the following applications: On-Highway Vehicles Fire Truck or Crash/Rescue Vehicles Non-Genuine and Rebuilt Component Quality Alert Electronic engine controls have been instrumental in aiding engine. Over the past week my car has starting running really poorly. " It could be something as simple as a faulty sending unit or thermostat. Treat the diesel engine and fuel system in your vehicle with the F-Bomb FB-001 Diesel Fuel Additive By Fuel Bomb. Adjust your Engine idle speed during warm up periods and use to do the following:. I have an x-Type 2. 3 runs rough when warm PLEASE HELP - HI Everyone, new to the forum have heard great things I hope someone can help me or point in the right direction thanks in advance for any help. Stalling When Climbing on One Side Diesel Fuel Return line Kinked. Seems to be worse when the truck is warmed up? (Seems opposite of what I'd expect for a problem like this?) The truck has 125k miles. 3 v8 gas has a very rough idle, and stalls at low manuver speeds like turning at low speed or backing up. Re: Solved my diesels hard start, running rough, & smoke iss Unread post by Bobbit » May 19th, 2012, 7:46 am Don't forget to let the glowplugs warm up before starting in the morning (Cold start). I own a Chevy S10 and have my friends here that is the 2001 version and it has the plastic intake air set up on it, it is a 2. If a Ford F250 runs rough until it warms up what could be the problem? Injectors or Glow Plugs? diesel and gas. got new plugs ,wires and. You didnt say waht year the truck is, but the 7. If you overheat it less badly, it starts, but runs rough. When talking about the Ford 6. E, Instrument clusters From stock or your faulty unit rebuilt with a LIFETIME WARRANTY. Another problem resulting from worn parts is a delay in the start of injection which in turn results in rough running at low RPM or your diesel engine not starting. 4l) seems to be having, and I couldn't really find any definitive answers. 3 IDI TURBO DIESEL LONG BLOCK ENGINE. This is what causes the common complaint of terrible starts and cold running until operating temperature comes up to normal. Customer Question 1998 mitsubishi galant, manufactured fall 97. I set the timing on the cold engine and it ran very smooth. I am the original owner of a 1990 GMC Sierra K1500 5. Once the engine was running for a few seconds, the engine ran as normal. Published Dec 7th, 2015. 0 liter diesel. I am also the only person to work on this truck so I know everything that has ever been done to this truck. Now when I start it, the engine is very cold, and it takes a while for the engine to quit missing (ussualy almost 10 minutes until it warms up enough). If engine will not reach operating temperature see manual. With a modern diesel creating very little waste heat, high idle does almost nothing to help warm up an unloaded engine. 0L Ford Super Duty, and 2004-2009 6. How to "Break-In" Your Newly Rebuilt Engine. It should be taken as an indication that there is a problem existing (or developing), that will potentially shorten the engine life, or result in unnecessary costs. Engine (3126 Cat) was running like a dream yesterday. 8l engine the other day it was running fine went to girlfriends house for couple hours then when i went to leave it started stalling on me. Re: Diesel runs rough once warm? If the fuel filter is plugging up it will run okay at idle and until you put some load on it and start trying to draw more fuel through the filter. Adjust your Engine idle speed during warm up periods and use to do the following:. Check our Engine emits white/blue smoke while running FAQ for assistance. Nor did any single engine do more to kill GM. Cost you less than $50!. I have an 97 with a 6. As the weather warms up, this is rarely a problem. Engine only runs bad once its warmed up. It's got to be able to breathe in, and breathe out, and any restriction in either direction may result in rough running, loss of power, and black smoke. Recently (and I think it is getting worse with time) the engine runs quite rough when first started up from cold. If the truck runs rough only at idle, a stiction issue is likely, so treat this the same way. 0 focus, up until the weather getting warmer I have been managing an average of 55mpg, of late I'm struggling. Therefore a diesel engine does not run rich or lean in the same manner as a gasoline engine. More photos of the engine can be seen in the photo section below and a video link is provided above. I own a Chevy S10 and have my friends here that is the 2001 version and it has the plastic intake air set up on it, it is a 2. If the engine in emitting black smoke, this could mean that the air filter is dirty, the fuel could have gone bad, and/or the carburetor is flooded. Caterpillar C-15 ACERT runs rough after sitting 8+ hours? This question was actually asked to me by another Owner Operator: I have a '05 ACERT that has about 45k miles on a platinum inframe thru Pete in Grand Island, NE in October '11. The 2011 Volkswagen Tiguan has 2 problems reported for engine runs rough. Since the car was at a complete stop whole night, the engine oil temperature falls below its operating range. (Click on any of the three images to view a larger image. Inspect/correct the leaks in the high pressure lines, fittings, or delivery valve gaskets. Black smoke means there's too much diesel and not enough oxygen, so the carbon in the fuel doesn’t have enough oxygen to combine with. Install 10,000 psi pressure gauge into the oil rail, startup oil pressure 870 psi. " It could be something as simple as a faulty sending unit or thermostat. Is there a small silver ignitor on top of the motor? It has a black wire going into it. It has not actually stalled, there is no smoke at warm idle. Super clean inside and out. It acts as if it is starved for fuel until it gets warm. If it is too hot engine parts overheat and get damaged. A common cause of an engine running rough is faulty ignition timing. Express Auto Inspections says: While modern vehicles use a fuel injector system to burn gas, many older cars use a carburetor to process fuel. Have you noticed your vehicle taking longer and longer to start, when it finally turns over its blowing white diesel smoke out the exhaust and runs quite rough until it warm? White diesel smoke at time of start is an obvious sign that things aren’t quite right, and if left untreated can become a much bigger problem. What causes a rough idle? A rough idle can be caused by many different car faults. Once I idle the mower to almost or full idle the mower starts sputtering and running rough while sitting still, when I try to drive it and mow with the same thing happens, and I won't even be mowing grass just turn the blades on and it acts like it wants to cut off but never does. Car runs fine when cold, but if left idle, once warm, idles extremely rough, and dies out when attempting to drive after warm up. This can lead to the engine running too rich or too lean (check your sparks for evidence). This kit will fit all 115, 116, 123 and 126 body Mercedes with the diesel engine. They're also known for their pulling power and rugged durability. 3 300 Hp Warm engine rough Idle Engine only runs bad once its warmed up. Also replaced fuel injector with no change. I can hear the engine "laboring" at one spot and it lunges forward at that exact spot. Now I think its something simpler. Cold start it hunts for idle speed, I give it a little gas for about a min and then it idle steady but rough. This is after a thourough warm up and hardly fluctuates if I am in traffic or coasting along at 50mph with the revs at approx 1600. 3 Powerstroke Changed oil runs rough [ Re: roadrunner1 ] #3170486 10/28/13 05:49 PM. It is one of those problems that is bad enough to notice and bother you, but not quite bad enough to put a lot of time and money into fixing. When I shut it off I can smell unburned fuel. A car running rough can be tricky to diagnose. I bought it from a used car dealer, and noticed the check engine light was on and ran a little rough. This usually happens when I'm sitting at a stop light or when the car is in park. When the oil and engine temp reaches normal the truck will run like normal with no performance problems. Nor did any single engine do more to kill GM. Engine - by rene 3/12/2018. * Depending upon your ambient temperature, bad glow plugs or a faulty glow plug control module can cause or exacerbate white smoke during engine cold start up. Your Engine just started acting up and you don’t know what to do. Even in warm, but not hot, weather, if I let the truck sit and idle in park for 10-15 minutes, it seams to get "hot" and will start the rough idle. Once the engine warms up, the car idles normally. It just started blowing white smoke 2 days ago when i start it. 3 HPOP puts on its components — 500psi at idle and up to 3000psi under heavy throttle. Car runs fine when cold, but once warm and if left idle, idles extremely rough and dies out when attempting to drive after warm up. Page 1 of 3 - Jd 400- Gets Hot, Runs Rough, Blows Smoke And Fire Out Muffler And Dies - posted in John Deere Tractor Forum: After mowing with my John Deere 400 for a while, it starts to blow some smoke out of the muffler and runs rough, sometimes will blow fire out of the muffler and then dies. Air in the diesel fuel system will also prevent an engine from starting. As stated, its a 99, so it should be a Powerstroke, and he said it starts fine cold, so I would rule out the glow plugs anyway, any diesel should start fine when warm without glow plugs. If engine will not reach operating temperature see manual. HIGH PRESSURE OIL LEAKS High-pressure oil leaks run amok in the 6. My truck was using a gallon every 1,000 miles with three broken rings. I had a few 7. This heat must disperse out of the engine to keep the temperatures cool enough to Why Does my Lawn Mower Engine Stall When it Gets Hot? | Hunker. I have an x-Type 2. Gross is a little over 32,000 and the ten mile pull with a lot of it at 7% yielded a top speed of 45 with engine temp in low normal range. could be 2-3 times the same day or after 2000 miles. It acts as if it is starved for fuel until it gets warm. I eased off of the accelerator a bit to settle in between 35 to 40. 3 300 Hp Warm engine rough Idle Engine only runs bad once its warmed up. 3 runs rough when warm PLEASE HELP - HI Everyone, new to the forum have heard great things I hope someone can help me or point in the right direction thanks in advance for any help. I'm trying to run down a problemthe engine runs great for about 15 minutes while driving hard. 3s come in last month that would run rough at random times. Boat engines have the same operating principles as do land vehicle engines, but having trouble with your boat engine can leave you and your family in a precarious predicament. 0L Power Stroke, all of which can result in a nostart situation on a warm engine. Lly duramax runs good when cold but runs and idles rough when engine warmed up If this is your first visit, be sure to check out the FAQ by clicking the link above. If it is too hot engine parts overheat and get damaged. 4 with a misfire/ running rough issue. If your GM 6. Fuel: Diesel v. Not sure if this is a clogged fuel line, carburetor or something else going on. Leaking connectors and check valves are the number 1 reason for having vacuum problems. (Some of these components may not be included with particular engines or applications based on engine. I replaced EGR and plugs, dealer tested coils said they are fine. I use Delo 15w40 as well. 4l) seems to be having, and I couldn't really find any definitive answers. Rough Idle/Engine Hesitation when engine hot was created by 96Pontiac Okay so I looked around on the forums both for the codes I have and my problem my 1996 Pontiac Grand Am (2. Its an old wives tale i say. Glow plugs are pencil-shaped electrical devices that are powered by the vehicle’s battery. 3 runs rough until it warms up, then, once it's warm, it runs much smoother; Intermittent rough idle when cold; Miss/hesitation at light pedal low rpm; Holding medium (1000-1500) rpm in neutral causes surging and cutouts; Your truck may not not re-crank if the engine's hot. Troubleshooting a Surging Engine If your engine is surging or running unevenly, chances are that something is wrong. Hey guys, been having problems with my 2005 duramax. because the engine has to warm up to 210 degrees before it runs with optimum fuel economy. Super clean inside and out. 18-06-95 94-95 5. 5 and purrs like a diesel kitten. I checked and fixed the under valve cover connections but they came back. 5 runs rough at idle and sometimes just dies at idle. COM 877-331-7153 [email protected] After the engine got warmed the tapping noise will slowly disappeared, also if I pressed the throttle during that loud noise and keep it in 2000rpm for about 3-5 second. Preignition can also make itself known when a hot engine is shut off. This video shows how to test 4 pin and 7 pin FICM's. Vehicle stumbles; engine runs rough at cold start with low ambient temperature L107. Building a 12cc Diesel Model Engine. a common problem on a high mileage engine would be fuel injectors leaking fuel while the engine is off, causing a rough run until excess fuel is burned off. How to Stop an Engine from Overheating. As the weather warms up, this is rarely a problem. Glow plug or glow plug relay faulty in a diesel engine. 1999 - 2003 7. This is what causes the common complaint of terrible starts and cold running until operating temperature comes up to normal. This last week however, everytime it idles, it runs very rough. This chart is to be used as a guideline for troubleshooting engine problems. One of the most common problems is likely a rough running or poorly idling engine.