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#1
11-19-2005, 07:59 PM
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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 BlackChime 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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#2
11-20-2005, 06:41 AM
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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
11-20-2005, 09:51 AM
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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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1995 S600, 1 of 618 (sold) "Speed is just a question of money...how fast you wanna go?" LONG LIVE THE W140! Visit my Web Page at www.v12uberalles.com
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#4
11-21-2005, 12:57 AM
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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 BlackChime 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
11-21-2005, 01:15 AM
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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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