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Old 05-01-2001, 10:05 PM
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Join Date: Mar 2001
Location: Schenectady, new york
Posts: 229
I have an '87 560SEL that has occasionally starting running very rich. It will be running perfectly, idle speed 650rpm
Then just as quickly drop to 500rpm and loads up on gas. It almost appears as though I'm temporarily losing my electronic control over the fuel injection system. Any ideas as to what's going on here? Am I losing an engine control module or something?
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Old 05-02-2001, 06:21 AM
ymsin's Avatar
Driver, Mercedes-Benz
Join Date: Feb 2001
Location: Malaysia
Posts: 1,645
If this is happening while idling, it could mean a check on the idle valve control. Start with this.
... Kerry

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