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Old 10-11-2020, 10:47 PM
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Join Date: Aug 2007
Location: Southern California
Posts: 393
1996 S500 - No Throttle Response

I am trying to diagnose an S500 that has been sitting around for 5+ years. The engine turns on, but immediately begins idle hunting even at cold start. Applying throttle input does absolutely nothing and putting the car into drive/reverse gears will hold idle without hunting or stalling.

I am immediately suspecting ETA and MAF failures. Any other suggestions or diagnostics to look at? Can I hook up a standard OBDII reader to this car to pull codes? Does a 1996 S500 have the same blinky code reader I am accustomed to on my older CIS W124/W201 cars that I can use?

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Old 10-13-2020, 06:39 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,284
There will be a round connector under hood. You will need diagnostics with that connector.

How does it run out on the highway?
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Old 10-14-2020, 11:39 AM
oldsinner111's Avatar
lied to for years
Join Date: Nov 2008
Location: bristol,tn
Posts: 6,198
check tb wiring sounds like the problem

tired of aches and pains? look and feel young again, ask your doctor if a 22 in the mouth is right for you
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