Idle drop - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 08-31-2009, 03:47 PM Thread Starter
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Cool Idle drop

I have a 1988 260E with 290,000 miles. Replaced nearly everything under the hood; most recent being a fuel distributor, fuel pump relay; other relays and calibrated the air flow meter. After car has been operating for a half hour, then stopped at a light, the idle will raise 100 RPM, then drop 200 RPM, recover, and go thru the same cycle until I accelerate from the intersection.

Also, engine requires lots of revs to re-start after being hot.

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post #2 of 3 (permalink) Old 08-31-2009, 06:38 PM
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Sounds like a Fuel Pressure Regulator issue.

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post #3 of 3 (permalink) Old 09-01-2009, 03:22 PM Thread Starter
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That's very possible. I look into it. Thanks. is offline  
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