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#1
01-07-2013, 08:37 AM
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94 E420 idle problems
I have a 94 E 420 145k, all stock, never molested. One day it started idle high @ 1200, and wont go down till you hit the gas, then it surges from 1200 to 600 ish. I cant figure it out. Cant find vac leaks, wire problems, and I did replace MAS, with no change. I dont have a check engine lite on.
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#2
01-08-2013, 06:52 PM
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My first thought would be to ask whether the upper engine wiring harness has been replaced. If it's original, chances are it needs replacing.
There is also a switch behind the gas pedal that controls idle speed. I don't know if a bad idle speed contact switch would cause a continuous high idle, but it has been known to cause idle issues. Here's a link on how to replace it. HOW-TO: Replace Idle speed contact switch When you say there are no codes, are you checking just the LED self-test (Diagnostic Module) or are you checking all the modules with a tester?
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1993 400E, 256,000 miles (totaled) 1994 E420, 200,000+ miles 1995 E420, 201,000 miles
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