Question about 2004 Mercedes-Benz C32 AMG

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Rough idle my car idles rough when i am in drive and not moving (eg stopped at lights). seems smooth when i am moving. any ideas what might be causing this?

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 61 Answers

SOURCE: I have a 2004 mercedes

possible low charge,possible leak,auxillary fans possibly not coming on,check you see when you turn your a/c on,do the fans get really loud occasionally,all the time,or not at all,if not at all ,you have a problem with the aux fans not coming on-

Posted on Aug 10, 2008

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tepfy
  • 319 Answers

SOURCE: engine rough in low idle

I would start by replacing your automatic air intake and throtle body sensor. Check these 2 things out and let me know.

tepfy

Posted on Feb 27, 2009

lastech
  • 408 Answers

SOURCE: MY 1985 300 SE IDLES ROUGH AFTER IT WARMS UP

hi,seem you have leak on intake manifold or rubber seal on injector nozzle,be careful drop a little amount on kerosene on intake manifold and nozzle,observe if your idling get high the is there,maybe renew rubber seal on intake gasket,ty

Posted on Mar 25, 2009

jasperoni
  • 203 Answers

SOURCE: Power Loss Mercedes 220 cdi '98 Trouble code P1403

It sounds like you have a vacuum leak somewhere between your valve and your source. A common vac leak that occurs on the 220 is at the vac. rubber y located at the back of the intake manifold. Follow your vac. line from the egr to the switchover valve and from the switch over valve to the source. Which is probably the y connecter

Posted on May 29, 2009

steve_e_uk
  • 1675 Answers

SOURCE: 96 mercedes c220, rough idle was every once in a

hi this sounds like it might be the MAF sensor may be on its way out, just looking through my technical data the only thing that would make it run this bad would be the MAF, what you will have to do is disconnect the sensor and then see if it idles better, if so then you will need to get this changed out for new one...hope this helps

Posted on May 29, 2010

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2 Answers

Car runs smooth, until I have to stop at red light or stop sign, then it runs rough. When I put it it neutral, it runs smooth. Could that be the EGR valve sticking? Any help would be appreciated, than


Depends on what you mean by rough. Could be a cylinder misfire.They sometimes are not noticed as engine speed increases during driving or under light load as when idling in neutral but at idle under load as when stopped at a light in drive became noticable.
Could also be running rich. The causes of either are too numurous to list.Consult a good mechanic who can actually see and hear the problem to put you on the right track.

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Check for trouble codes. You can get this done free at most car part stores.

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Idling is too slow at 500 rpm.......think about at least 650 rpm to charge the battery and keep up inertia for better take-off power.
Find out how to increase rpm,whether it's a screw-stop adjustment or a timing problem. don-ohio (:^)

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Still Rough Idle After Battery Disconnect


The first thing to do is not set up the idle speed, but to set the Idle mixture screw to lean best idle setting. First, turn in the mixture screw until the engine dies or runs worse, then back out the screw (recommend turning ¼ to ½ turn at a time). The engine should pick up speed and begin to smooth out.

The battery has nothing to do with the idle speed

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Idle good when cold, hotter it gets the worst it idles especially when sitting at stop lights


simple test for a vacuum brake booster
star and run the engine at idle without applying the foot brake
if it gets worse when the foot brake is applied , it is a vacuum leak in the booster ( replace the booster )
otherwise check for failed vacuum hoses including under dash control lines , vacuum leak at the manifold or EGR unit

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My 96 olds does not like to start when it gets hot. seems to start ok when it cools down. Any ideas? It doesnt start real easy when its cold. have to rev a let idle a little before moving. idles pretty...


Hello, I have 1996 Ciera with rebuilt engine pretty new, also fuel filter and fuel pump replaced but I have a problem, the car starts and runs well cold but once car has been running for a few hours, either stopping or coming to a stop it starts to idle roughly and has come to a stop at different occasions. Check engine light does come on and off occasionally. Can you help?

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1 Answer

Not idling smoothly, sometimes having to restart at a stop w/ tranny in drive.


sure, that could be it. I would also suspect the fuel filter as well.

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