Question about 2002 Mercedes-Benz C-Class

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Rough engine idle

Have a c class c240 2002 engine has a rough idle it's getting worst, it's only when it's idleling, at normal speed engine seems to be running fine. Can someone advise? Thank you

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2002 1500 rough idle wont go over 35 mph service engine soon

Have you O2 sensors checked out. I have blowen out 2 on the same bank, sounds like the same problem. Check engine light will stay on solid, blink for a while, solid. Surefire way to check is run your finger in the tailpipe after it is cooled down. If it is very black with soot, then it probably is the O2 sensor.

Posted on Mar 19, 2009

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SOURCE: 1997 ford explorer not idleling right at a stop

sounds like it could be either your throttle positioning sensor or even mass air flow sensor

Posted on Mar 23, 2009

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SOURCE: loosing power at cruising speed

have you had the transmission flushed? it seems to be caught in a limbo. where the calibration of the speedo and the transmission are not compatable. Now as wierd as that seems it happens usally like when going up a hill if you have a manual trans. and cruise locked in. it cant hold that speed and moves to a different speed if you dont down shift. Or perhaps your cruise control cable is slipping. is it vacume over mechanical? pop the hood and make sure all your hoses to cruise control are tight and no leaks.

Posted on Apr 04, 2009

heavymetal77
  • 721 Answers

SOURCE: mercedes c240 2001 low idle speed

Yes,check the fuel pressure & filter. There's about a million other things to cause this,so start simple. Ask again if this doesn't help.

Posted on Jun 21, 2009

  • 126 Answers

SOURCE: misses fires and sputters

1 Inspect Distributor Cap and Rotor Kit Loose, Cracked or Worn Distributor Cap. 1 Inspect Wireset Worn or Damaged Spark Plug Wires. 2 Inspect Distributor Cap Loose, Cracked or Worn Distributor Cap 1 Inspect Condensor-Ignition Faulty Condensor-Ignition. 1 Inspect Timing Specification Incorrect Ignition Timing. 1 Inspect Timing Specification Incorrect Ignition Timing. 2 Inspect Spark Plug Fouled, Damaged, or Broken Spark Plug(s). 3 Inspect Distributor Worn, Damaged or Faulty Distributor.

Posted on Sep 06, 2009

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Sounds like possible vacuum leak. Next time it starts try spraying starting fluid around vacuum hoses, if engine speeds up, there is a vacuum leak at that point where you sprayed. Hope this helps.

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Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

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Idleling is normal. When accelarating the car is slugish.when decelarating to stop at a low rpm engine dies. This only happens when you are stopping or driving from a high speed to low speed pr stopping


CHECK THE CONDITION OF YOUR FUEL FILTER, TRY REPLACING IT, ALSO CHECK THE CONDITION OF YOUR THROTTLE BODY ASSEMBLY AND YOUR IAC SENSOR (IDLE AIR CONTROL UNIT)

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Sitting in car in parking lot with engine running - it dies, won't turn over... I get a jump start No changes in termperature gages at all Idles rough, check engine light on, reduced engine power reading -...


Hi and welcome to FixYa!
It is safe to drive and I assume that you are on limp mode. This is to restrict the speed to avoid further damage to the engine. You can be facing some sensor issues like the MAF (mass air flow) sensor or TPS (throttle position sensor). If one of these sensor is faulty the car tends to run sluggish, run rough or may even result to stalling.

Have the sensors replaced and observe how it goes. This can fix the issue.

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