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1987 420SEL Running rough, idle bouncing, HELP | Mercedes-Benz Forum When warmed up, it seems to stall after a longer period of time while the idle bounces between 400-1000rpms and runs quite rough, shaking a bit when at lower RPM I cleaned the idle control valve by soaking it in carb cleaner and when shaken you can hear the valve flap
Rough Idle - 87 420SEL - please help! | Mercedes-Benz Forum - BenzWorld. org The problem is a rough idle It is idling at 750 in neutral and about 550 in drive The idle is quite rough, like there is a massive air leak, but I cannot find any such leak I have also replaced or checked by swapping from a "known good" car: * Spark plugs * Plug wires * Distributor cap and rotor * Fuel filter * Fuel pressure regulator
My 420SEL is sick with a rough idle | Mercedes-Benz Forum - BenzWorld. org I have this 1987 420SEL with 115,000 on the clock Soon after startup my idle is really rough I notice my economy gauge sitting right in the middle (at idle) and I loose some power My ABS is kicking in at low speed on occasion The RMP's stay right where they should at idle
Mercedes-Benz 420SEL Rough Idle Issues Solutions - RepairPal Find the most common driver-reported problems that are to blame when a Mercedes-Benz 420SEL has a rough idle Explore common rough idle issues for the Mercedes-Benz 420SEL, including vacuum leaks and spark plug problems Get estimates and local repair help on RepairPal
1987 Mercedes 420SEL Idle Problems - Expert Q A - JustAnswer Your rough idle can be compression related or vacuum leak related but what I have found to be the problem more often than not is a faulty fuel distributor If the motor has good compression and is properly tuned and adjusted and there are no vacuum leaks I would suspect the fuel distributor
I have a 87 420 sel that I just bought. It ran very rough at idle and . . . Often times your air leaks are at the injector seals Other times poor idle is misdiagnosed as an intake leak when it's really a bad fuel distributor causing the problem It's not unusual to see uneven fuel distribution from the fuel distributor cause a rough idle The only manual I've seen on the 126 cars can be found here eurotec40186 1396922107
420 SEL Idle problem - Mercedes-Benz Owners Forums it sounds like the idle control unit might be suss It's electronically done on the 420 V8, and short of testing it to see if it works or not, there isn't a lot you can do except replace it if it's duff
Idle adjust on 87 420 SEL - PeachParts Mercedes-Benz Forum Can anyone tell me how to adjust the idle on a 420 SEL? It idles at about 500rpm while in drive and 600 in park In drive the idle is a little rough and if I press the pedal a little to raise the rpm to about 650RPM its smooth as silk