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Old 10-16-2002, 11:42 AM
Registered User
Join Date: Dec 2000
Location: Boston area
Posts: 31
Question High idle on my M103

I've got a head scratcher on the fuel injection side of my 'new' 300SE. It's a 1991 with 170K miles and appears to be very well kept as it runs good and everything appears to be genuine MB.
When I start the vehicle, either cold or warm, the idle immeditely jumps to about 1K and stays there. If i hit the gas pedal, it just revs a little higher and settles back to 1KRPM. The car does start easily with just a few cranks.
If I pull the electrical connection from the front of the Idle valve the RPM drops immediately down to normal..sounds really nice. If I plug it back on, sometimes it jumps back up but most of the time the RPM stays at normal. If I shut the engine off and restart, the RPM jumps up to 1K again. It's very repeatable.
Also, the EHA valve on the back of the fuel distributor weeps a little. I've changed the green O-rings and checked for cracks and all appears OK but after running a few minutes you can see it getting a little wet from fuel. Don't think this has anything to do with the idle problem, but I'm not exactly sure.
ANy help would be appreciated...Thanks for the help.

1991 300SE 170K
1985 300TDT 172K original owner, really cherry for an '85

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