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I have a 1995 Mercedes Benz SL 500 that runs rough when started after sitting for several days.

The car runs fine if I use it daily..if it sits for several days it starts ok, but runs rough, backfires, and smells like rotten eggs. If I drive it for several miles it will clear up and run good until it sits for several days again. The check engine light does not come on when it's running rough. Any ideas?

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  • Cars & Trucks Master
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Hi Jhlightcap.

The Common Problem: Rough Running Engine

A properly-operating engine should run smoothly and without excess noise. If your engine starts operating in a manner that gives you the perception of "running rough", it is likely due to a handful of common causes. A mechanic would investigate these common causes first in order to rule out a simple explanation for the engine's unsatisfactory operation.
The common causes for rough running in an engine are:
  • Engine miss
  • Vacuum leak
  • Dirty fuel injectors
  • Carburetor problems
  • EGR valve
  • Ignition coil
  • Spark plug wires
  • have a look at this link.
Rough Running Engine James on Engines 2

Posted on Dec 10, 2017

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6 Suggested Answers

6ya6ya

6ya staff

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SOURCE:

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Posted on Jan 02, 2017

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Anonymous

  • 1 Answer

SOURCE: Car runs rough and misfires

if u checked the codes and it showed that a o2 sensor is bad make sure ur on the rite one as in {sensor 1 bank1 or sensor1 bank 2} when u change a sensor always make sure u got the rite one.


hope this helps

Posted on Apr 21, 2009

tekk1

  • 11 Answers

SOURCE: 1990 buick wont start after driving needs to sit for a while

try fuel filter first

Posted on May 28, 2009

Anonymous

  • 1 Answer

SOURCE: Car won't run after rain or after it sits for a couple days

you need a tune up new plugs wires and cap an rotor

Posted on Jun 16, 2009

Anonymous

  • 56 Answers

SOURCE: The engine suddenly started running rough

CHECK YOU'RE catilactic converter

Posted on Feb 03, 2010

tony batson

  • 56 Answers

SOURCE: 2003 Ford Taurus cylinder misfire #1 and #5 code

sounds like your wires are switched around. have replaced the plugs lately

Posted on Oct 08, 2010

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