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Author Topic: It idles rough  (Read 2380 times)

jsandoval

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It idles rough
« on: August 18, 2007, 23:16:23 »
I have a 1969 280SL Euro. When I first start the car it will idle rough even after it warms up. But after about 15 to 20 minutes of driving the idle smooth out. I am not sure what to do to correct it. Any suggestions?
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jeffc280sl

  • Guest
Re: It idles rough
« Reply #1 on: August 19, 2007, 07:50:55 »
I would check the operation of the fuel injection pump (FIP) thermostat.  Do a search on this topic for details.

Jeff C.
1970 280SL 4-speed
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ja17

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  • USA, OH, Blacklick
  • Posts: 7414
Re: It idles rough
« Reply #2 on: August 19, 2007, 18:04:38 »
Hello,

I agree with Jeff.  This "WRD" can be stuck or it's air filter may be plugged. Take a section of rubber hose and use it as a stethescope at the tiny air filter on the injection pump.  It should be sucking air when the engine is cold but should not be sucking air after the engine is warm.

Joe Alexander
Blacklick, Ohio
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Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback
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