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Old 06-29-2003, 01:25 AM
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EricSilver EricSilver is offline
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Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,209
Will Leaky Injector Seals cause Rough Idle?

1989 260E

I have 3 or 4 leaky fuel injector seals that I plan to replace this week. Could they be contributing to somewhat rough idle -- with the car continuously trying to adjust fuel/air mixture?

I have an all-new and Position Sender Unit, distributor cap and rotor, STI spark plug wire set and properly-gapped Bosch copper plugs. Fuel pump relay, OVP and ignition control unit are all fine.

I have always had a slight rumble at 500-600 RPM idle, which goes glass smooth at 1000+ RPM (at which point I can't tell if I even have an engine). My assumptions are the leaky injector seals, or perhaps a dirty fuel filter (which I also plan to replace this week).

Any thoughts?
2001 E430 4matic
122,xxx miles
Black/Charcoal Interior

Gone but not Forgotten:
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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