Diesel engine running rough at idle

  • Symptoms:The engine runs really smooth when cold started. It still runs good, after the choke plate has completely opened and the engine hasn't run for more than say 5 minutes. When the upper radiator hose starts to become warm, the idle gets rougher. The situation gets worse, when the engine gets hotter e.g. during city driving.
page 248 - Engine Speed Surges at Low or High Idle page 249 - Engine Speed Surges Under Load or in Ope... page 250 - Engine Starts But Will Not Keep Running page 251 - Engine Vibration Excessive page 252 - Engine Contact a Cummins® Authorized Repair Facility. Engine Runs Rough at Idle.

May 21, 2015 · It is most noticeable when first starting and reversing of a morning once in a blue moon. When the car is at operating temp and idling in gear, a very slight miss/hesitation can be felt. but for the most part it runs smooth. It doesn't miss under load (read throttle pinned to the floor) or when cruising at speed.

An unmetered air leak in the induction system, or an engine mechanical issue causing rough running, may cause the ECM to learn an incorrect Throttle Body Idle Airflow Compensation value over time. This incorrectly learned value may cause various symptoms to occur such as MIL on with P1101 setting, rough or unstable idle speeds and/or engine stall.
  • Sep 09, 2014 · When the car starts say first thing in the morning or when its been sitting a while, It idles really rough almost to the point of stalling. Also i can smell and see that the car is running really rich. Once the car warms up, it idles beautifully and drives good with no issues. Doesnt over heat or anything.
  • Aug 25, 2006 · The new A/C program can have the A/C compressor engaged at idle sped. This will contribute to a increased load on the engine and it can idle a bit rough. Try an experiment - - With the A/C on with both red lights lit up, observe the vibration at idle. Now touch the red light button to turn off the A/C. Observe if the idle smoothed out to 'normal'.
  • Apr 23, 2012 · I tracked down when my engine starts to run rough. This is how it goes. Drive to work which is normally a 15 minuet drive. Shut the vehicle off and go into the office. Go back outside 15-30 minuets later and start it up. Once the idle settles down after inital start up it starts to sputter.

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    Rough Idle, Warm Engine. Check / adjust low idle screw setting. Bleed the fuel system and check for suction leaks. Check / replace fuel return overflow valve. Check / replace fuel transfer pump. Check / correct injection pump timing. Replace injectors. Replace engine mounts. Remove injection pump, check calibration.

    Injector “blow-by” can be the cause of some of the following symptoms. Hard or difficult starting, erratic or uneven running or idle speed, rough running, smoke while running or acceleration, black tar around the injectors and a chuffing sound from the engine when running.

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    Jul 25, 2017 · Refer to 3100 HEUI Diesel Truck Engine, SENR6566, for Inlet Heater Driver Open Circuit or Inlet Heater Driver Short Circuit. 2. Air In Fuel: Check for air in fuel by installing a 2P8278 sight glass on the return line. If access to the rear of the engine is restricted, install the sight glass on the return line at the tank.

    The idle motor it self has quite a bit of delay to get the mass of the motor internals moving. The engine itself has the most delay from air fuel volume changes to resulting RPM changes. So say your engine is at 600 RPM and the idle controller makes a change to the ISM to increase the RPM.

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    Engine running-in at idling speed is not possible. This method can lead to severe wear or damage. Problems associated with runningin at idling speed. The inadequate engine speed means that the oil pump generates too little pressure and does not supply enough oil to the lubricating...

    Apr 21, 2017 · As noted above, a diesel will not warm to operating temperature until it is under load. Thus you need only let the engine idle long enough to fully circulate the oil 30 seconds is plenty. But don’t immediately put the pedal to the metal. A few minutes of idle speed will warm the oil so it flows better.

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    Sep 24, 2011 · 2007 Colorado Z71 5cyl. automatic 86k mileage When coming to a stop the rpm drops to 500 and feels like it is going to stall. It then jumps back up to about 750, but idles rough. The engine completely stalled one time as I was braking coming off of a freeway off-ramp into a turn. The check...

    Aug 11, 2011 · i have a 87 ranger 2.9 that i have done alot of work too. after all my work i still dont have it running 100 percent. when the engine is cold it runs fine, it idles fine all the time but as soon as the engine warms up it starts surging and running rough until you give it wide open throttle or idle... any insight for me... i am getting tired of chasing dead ends with this old ass computer ...

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    With the engine running crack open the fuel bleed valve - the engine should stutter/stall and there should be no fuel flow. Continue to step 3. If you have Fuel pressure should read between 3 and 7 psi at idle. Anything lower than 3 psi may indicate that the lift pump is not performing properly and should...

    Dirty injectors will lean out the air/fuel mixture, causing a loss of power, rough idle and sometimes white smoke in the exhaust. Leaky injectors will richen the air/fuel mixture and cause black smoke. There are a couple of ways to find a bad injector on a diesel engine.

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    Oct 02, 2006 · Let me bring this post back from the dead. I just bought a 2001 7.3 F250. It was a fleet vehicle and was sitting for around 1 year. It is throwing the service engine light, runs rough at idle, feels like a cylinder is missing out, has lacking power, and all together sounds not perfect.

    My car was running perfectly until I disconnected the negative battery terminal to install fog light bulbs. I reconnected it ten minutes later when I was done and tried to start my car and it died. I started it again and the idle was rough so i let it run for...

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    Apr 21, 2015 · Rough idle in vehicles with Gasoline Direct- Injected engines. Drivers of direct-injected gasoline engines have been complaining about a rough idle and a check engine light that has been illuminating on the dash. These engines are experiencing a problem with carbon build-up on the top side of the intake valves.

    Dec 16, 2013 · Haven't let it run that long since it the rough idle and smoke started. Hasn't been running more than 5 minutes at a time since the worries began. And not sure, hasn't been on the road since, but the smoke is quite obvious during day and night here.

Dec 27, 2016 · I noticed that when I unplug the pigtail connector from the VCT Solenoid in the valve cover (as it's rough idling), the engine starts running fine after a restart (this is because the PCM detects a fault, and puts the timing in a default position I think). My car has 128000 miles. My car has an automatic transmission.
Aug 11, 2009 · 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 not starting. Faulty high pressure pump If the pump is faulty there will be a "low fuel pressure" problem.
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I am trying to find out if I should leave my Diesel engine running when I stop in a rest area, or continue to turn it off? The flip side...How long at idle before departing in the morning? This is the one you hear the most complaints about. I unhook, pack it all up, start the coach let it rise and build air, do a...