1987 Mercedes Benz 190e Rough Idle

1987 MERCEDES BENZ 190E
155,000 MILES • 4 CYL • 2WD • AUTOMATIC
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BAMBOOORGAN
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  • 1 POST
Idle is good at neutral but when shifted to drive idle gets rough or low idling but engine don't die. Same as on reverse, from neutral to reverse, idle gets rough. Over 35 mph , car drives normal.
Jan 21, 2008 at 4:21 PM
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Do you have a check engine light On or has flashed?

Last major tune -up and what was replaced and adjusted

Lets check the idle air control valve/speed controller device, the PCV valve, to include the throttle position sensor. One of the above is causing the problem.
Jan 21, 2008 at 4:30 PM
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CBONES
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  • 15 POSTS
check for vacum leaks
Jan 26, 2013 at 1:29 AM
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