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Old 01-14-2004, 01:49 AM
Dave Bunker's Avatar
Join Date: Aug 2002
Location: Elk Grove, CA. 95758
Posts: 90
throttle problem 87 420SEL

Any 420 owners out there ever experience a throttle, that when you let off of it (usually most noticable on the highway) you can feel it wavering up and down? It gets so pronounced at times when I'm backing up after a shot run to the store, the car lurches back and forth....driving me crazy....I changed out the computer mod with a spare. Didn't make any difference......Thanks in advance for some ideas.....

Dave Bunker
Dave Bunker
1987 420SEL, 180k strong Blu & Grey
2004 Road King Custom
Sacramento, CA
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Old 01-14-2004, 01:08 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
It sounds like you might be going in and out of decel cut-off. I don't recall what all is in the circuit on a 420 but I would verify at least the operation of the throttle idle contact.

To verify the problem you could disconnect the EHA once the car is warm (won't start well cold with it disconnected) and drive it. If the problem is gone then the decel function is a likely candidate.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 01-14-2004, 03:17 PM
Registered User
Join Date: May 2003
Location: Rockville, MD
Posts: 96
Yes! And Thanks

I was going to post about this on my 87 420 but figured maybe it was just me. I don't really feel it on the highway but when letting off the gas around 40-50mph, I can actually see the tach needle cycle up and down a few millimeters slowly as I coast. I'll have my mechanic look at the throttle idle contact.

04 C230K Sedan
01 Boxster

00 C230K Sedan (sold)
87 420SEL "Phatryd" (sold)
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