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Old 10-07-2001, 05:53 PM
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Join Date: Jun 1999
Location: Albuquerque, NM USA
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300E Bad Idle

Wife's 1988 300E occasionally experiences a no-idle problem. Must left-foot brake and maintain revs at 1000 or it dies. Happens intermittantly now, but suspect it may become a permanent condition. Can anyone suggest where the problem is?
Kent Christensen
'07 GL320CDI, '06 SLK350
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Old 10-16-2001, 06:31 PM
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possible problem: idle control valve, overvoltage protection realy, fuel pump relay, etc.

it could be several reasons.

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Old 10-16-2001, 07:35 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Most commonly we see the overvoltage relay, the speed sensor in the rear of the speedo and the air flow housing causing this.

Keep in mind, these are just the things we see often and it could be anything else.
Donnie Drummonds
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Old 10-16-2001, 10:31 PM
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
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Of the sources Benzmac mentioned, the air flow housing and the OVP can be checked quickly...
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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Old 11-23-2002, 11:16 AM
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Join Date: Nov 2000
Location: Gaithersburg, Md
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How can the OVP be checked? My air flow housing has a hole in it (where it bolts to the car) coould this be causing low idle?
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