Question about 1995 Mercedes-Benz SL-Class

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MB SL500 Fuel Problem, running rough, etc.

I have a 95 SL500 w/80K miles. for about a month it has "only sometimes" run rough at stop lights, etc. after it heated up. But I recently changed the fuel filter (which is installed correctly w/ the arrow fwd) and now it runs fine and accelerates fine when it is cold and has been sitting for a while; but after it warms up, it does not get enough gas when accelerating and idles rough so that I have to put it in neutral at a light to keep it running. Also if you just keep the accelerator in a fixed position at say 1200 RPM it runs fine, and once up to speed at 30-50 mph it seems fine, but even at those speeds it balks on acceleration. Can you help me figure this out please? Thanks.

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  • rocketguy2 Aug 13, 2008

    Toddg:

    There is no need to get testy. This is a car prob not life and death. Look at it from my viewpoint. I have received 5 solutions from you experts and no 2 are the same. So maybe you are correct I don't know, but when the car ran OK before I replaced the fuel filter and runs badly now; Maybe you could help me understand that and forget about your crankshaft position sensor for the time being. Just answer all my questions with some logic. Then maybe we can arrive at a solution. Thanks.

  • fmr8 Mar 11, 2009

    Car idles up and down then stalls after a while when warm, it will stop at traffic lights, i have been told it was the air flow meter but not shore

  • Anonymous May 17, 2009

    Car starts fine when cold ,after running for about 15 min runs rough.Once it stops will not start just backfires.After about 1 hour it will start fine.Any help will be appreciated.Thanks John

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2 Suggested Answers

Pyrhyc
  • 2028 Answers

SOURCE: MB 95 SL500 Fuel Prob, Running rough, etc.

This sounds like the throttle positioning sensor (TPS) is going out. Could also be a bad O2 sensor or partially blocked EGR valve. Start with the TPS, then got to the O2 and EGR.

Posted on Aug 12, 2008

  • 35 Answers

SOURCE: 1999 GMC SIERRA 1500 4.3 AUTO , INTERMITTENT

More then likely you have a faulty throttle position sensor (TPS)

Posted on Dec 14, 2009

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MB 95 SL500 Fuel Prob, Running rough, etc.


This sounds like the throttle positioning sensor (TPS) is going out. Could also be a bad O2 sensor or partially blocked EGR valve. Start with the TPS, then got to the O2 and EGR.

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