Date registered: Apr 2003
Vehicle: 1986 W124 300E
Location: Reading, England
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RE: c280. running rough idle.
If your car is stalling for no good reason, ie when slowing down in traffic it just cuts out its likely to be the Over Voltage Protection relay (OVP). These relays had a design fault in them from new. The replacement has been redesigned internally and cures the problem.
Its a real common fault on all M104 engined cars, ie such as yours. It costs about $60 to purchase and can be fitted in about 5 minutes.
If you car is surging (ie; rev needle starts bouncing up and down and car starts to jerk forward) whilst in gear and waiting at lights its likely to be a dirty throttle body. Again this is another real common problem. The butterfly flap in the throttle body collects a load of crap on its outer rim which stops in from closing properly. This then confuses the ECU and it tries to pump more fuel into the engine etc etc.
Easy job to clean it with some Carb cleaner. This job is often overlooked when your car goes in for service and causes all sorts of problems on the M104 engines.
1986 300E 81,000 Miles
2002 A190 26,000 Miles (the wifes)
1985 AMG Hammer W124 5.0 V8 with AMG Quad cam heads
1995 C280 Elegance 42,000 miles, Black
1993 E280 91,000 miles, Black (accident)
2001 E220 CDi Advantgarde
1998 C230K Sport
1997 C200 Sport