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Old 08-31-2003, 12:13 AM
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Join Date: May 2001
Posts: 301
Is a sticky "slip plate" causing performance problems in my 420SEL?

I just read a letter to the editor in an MB magazine that states: both a stalling problem and a throtle responce that resembled severe turbo lag were remedied by fixing the stuck slip plate located under the air filter on the author's 1987 420 SE. I did a search but turned up nothing on slip plates, can anybody add to this idea?

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Old 10-07-2003, 02:21 PM
nuclearman's Avatar
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Join Date: Sep 2003
Location: ontario
Posts: 19
Thumbs up sticky slip plate....cure??

Hey...I have had a reoccuring problem recently with my 92 was stalling while driving and I had poor throttle response.

My cure for this was to remove the air cleaner...and inspect the thottle body and said "throttle plate". So what did I find???well the throttle plate had grime built up along the edges and the small hole in said plate was also looking pretty dirty...I cleaned them with..carb cleaner and fired it up wth no problems. This morning it was about 0 degrees celius(aka 32 degrees F) and it started fine and drove fine.

At idle, Rpms were steady at about 600 and did not change much when braking or in "stop and go" traffic on the highway. Throttle response also was better. Also my air filters were dirty and have to be replaced shorty. You can still see through them but not as clearly when new.

I hope some of this helps...
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Old 10-08-2003, 04:03 PM
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Join Date: Jan 2001
Location: Cedar Rapids, Iowa
Posts: 63
On my '89 420SEL the stalling and severe bog on throttle application was caused by a failing ignition coil. You might test your spark through a spare spark plug. Mine wouldn't fire with an adequate arc. It solved all my problems after I finally got the right one to replace it. The catalogs at the parts places are wrong. Do a search, we already talked about the right Bosch number.

'89 420 SEL "Moby Dick"
'30 Ford Coupe
'31 Ford Slant Windshield Town Sedan
'33 Ford Pickup
'34 Ford Pickup
'01 Honda Passport
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