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Old 06-11-2003, 11:57 PM
WANT '71 280SEL's Avatar
I'll Go Upside Your Head!
Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
do I need a new idle control valve on 300E?????

I have cleaned the idle control valve 3 different times with carb cleaner but the car still has the surge at idle. It is an '87 300E. A lot of times it will start but then die immediately, are they related? It also will have a hesitation sometimes taking off from lights, etc. Are all those related to it?
To test the idle control valve I have turned the key to on but did not hear or feel anything from the valve. Am I checking it correctly? I do not want to pay $150+ for a new one if I do not have to.
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Old 06-12-2003, 09:45 AM
pesuazo's Avatar
Registered User
Join Date: Oct 2002
Location: Near Raleigh, NC
Posts: 580
Idle surge is not caused exclusively by the Idle Control Valve.

Other causes of idle surge are:

1.- Vacuum Leaks (the hoses that connect to ICV, Intake Manifold Gasket, etc..)

2.- Air Mass Potentiometer wore out (there are excellent posts with pics.... do a search)

There are many solutions already posted, most likely one of those will solve your problem.

Good Luck and keep us posted.

Let us know which solution worked for you.
1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
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