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  #1  
Old 11-19-2005, 07:59 PM
Brooklyn,NY
 
Join Date: Apr 2005
Location: Brooklyn,NY
Posts: 252
92 500sel idle problem

Hi everyone. Just bought 92 500sel. Idles good when just started then It goes up and down. Will idle good like 650rpm for 30 seconds sometimes longer then it drops car almost stalls then idle goes up to 900rpm then back to normal. Any ideas what it can be? Thank you
Victor
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1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
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  #2  
Old 11-20-2005, 06:41 AM
Member
 
Join Date: Jan 2003
Location: Florida
Posts: 1,084
Its got a idle speed matrix, to speed up the engine when things are running, like AC, an load on the power steering etc. It is mentioned in the service CD. For starters get yourself the MB service CD, its $160 and covers wiring and trouble shooting 92-99 and owners manuals.
The car has sort of an electronic accelerator, dont move the linkage under the hood by hand while it is running, I have been told it will go into limp home mode (very little power from accelerator).
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  #3  
Old 11-20-2005, 09:51 AM
pcmaher's Avatar
Big Black V12
 
Join Date: Apr 2003
Location: Chicago, IL
Posts: 430
Might also be the MAF sensor. Insulation on the wiring in these cars go bad after time. Check out the link below. It's specific to a V12, but the problem is the same...

http://v12uberalles.com/MAF_rewire.htm
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  #4  
Old 11-21-2005, 12:57 AM
Brooklyn,NY
 
Join Date: Apr 2005
Location: Brooklyn,NY
Posts: 252
thank you for help. my cam advance solenoids wire insulation falling apart. its all cracked and falling off wires leaving them exposed and shorting. i think the rest of wiring is in same condition. i have to check throtle actuator wires. thanks
__________________
1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod

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  #5  
Old 11-21-2005, 01:15 AM
e420A1's Avatar
Registered User
 
Join Date: Nov 2005
Location: dearborn, mi
Posts: 26
sometimes it is carbon buildup on the EGR valves that causes rough idle. my 97e420 idle fluctuated slightly when cold. i noticed that when idling the rpm would go from about 650 to 500 and up again but i don't notice that once the car warms up. my car has 152k miles.
if it is carbon deposits then the only way is to take the head top off and manually clean the valves.
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