1993 Mercedes Benz 500sl High idle, 'hunting idle'

Sounds like you may have a vacuum leak.With engine idling carefully spray around intake area with carb cleaner.If the engine rpm changes you have found a leak.

just another thought, I glanced at a fix database. Suggestions, main wiring harness-- throttle actuator-- throttle cable, if all that checks out, check for a faulty air mass sensor. Pay attention to Jack, he always helps me, when I get in trouble.

[quote:4878672de6="2CarPro Jack"]Sounds like you may have a vacuum leak.With engine idling carefully spray around intake area with carb cleaner.If the engine rpm changes you have found a leak.[/quote:4878672de6]

I'll try the 'ol trick with carb cleaner... ( But other than the high idle & 'hunting' idle, the engine is smooth & strong)

New engine wire harness, just put in a rebuilt Throttle Actuator, swapped an E Gas module & didn't improve. ( New tune-up)...

[quote:72adeb351b="jdl123"]just another thought, I glanced at a fix database. Suggestions, main wiring harness-- throttle actuator-- throttle cable, if all that checks out, check for a faulty air mass sensor. Pay attention to Jack, he always helps me, when I get in trouble.[/quote:72adeb351b]

All checked out..... My '93 500 SL doesn't have an, air mass sensor.

(Which I am talking to you guys)....

What do you know about that Accellerator Peddle/ Position sensor ( mounted on gas peddle bracket?)

My bad, maybe I was looking at the wrong engine family?

If you get the feeling I don't know what I'm doing, some days I get the same feeling. Thanks alot Mike.

( I miss-wrote my silly comment)..... " Which is WHY I am talking to you guys"... Trying to nail down cause, because I am getting different suggestions..... Thanks for that drawing ( small to read)..... But where is it located??

Sorry for the picture quality, I tried to magnify a little, If I magnify too much, you can't tell anything about the picture. B2/3 and B2/4 is the location. When I said," thanks alot Mike", Mike is my boss, he told me to take a look at your post. I guess I waited too long, Jack was already talking to you. I'll help anyway I can.

Thanks, much appreciated..... When I remove my large air box, you see a single 3" opening about in the center of the intake manifold, with the Throttle Actuator under it. The airfilter/airbox has a 3" opening in the center/bottom. I see no air sensors as shown.... I have air inlets on either side of airbox, into the airfilters, but no sensors. Hey, I notice your address is in Anaheim? I'm in Corona Del Mar.... ?? Possible to just drive the beastie to you? ( $) Donation?

The picture came from a Mercedes parts book for your year make and model. I can't tell you what to replace, only make suggestions on what to check. Sometimes the databases and partsbooks are not correct, but, that is all I have to go on. Because this is an internet site, the people that help out here are from all over the world. I live in Oklahoma.

I like that state..... ( I used to haul a prototype Sooner Trailer for Team Mears / INDY... NICE trailer!! Uh, I always learn from you guys.... Maybe my Mass Sensor is the single opening on top of my Throttle Actuator..... I'll take a look .. ( I am working on getting a repair manual... that'll help!!)