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Old 05-20-2004, 10:33 AM   #1 (permalink)
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c280. running rough idle.

my c280 94, just stall and i called a mechanic and the fuel filter was changed and injector was cleaned but it is still have a rough idle. what can i do
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Old 05-20-2004, 07:31 PM   #2 (permalink)
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RE: c280. running rough idle.

All I can tell you is make sure you check the wiring harnes, don't let that go bad and fry your ECU. That;s the worst case senerio little things to check, are the 0xygen sensors, the plugs, wires, and coil connectors. All relativly cheap and you can fix yourself. Also check all the grounds under the hood the car has a few. Good Luck

1994 C280 Emerald
Eibach springs, Bilstein shocks, Brembo Cross drilled rotors, AMG Stagered Stars off CLK 430, MY TRUE GEM
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Old 05-21-2004, 02:19 AM   #3 (permalink)
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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.

Good luck
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1986 300E 81,000 Miles
2002 A190 26,000 Miles (the wifes)
1985 AMG Hammer W124 5.0 V8 with AMG Quad cam heads

Previous Mercs

1995 C280 Elegance 42,000 miles, Black
1993 E280 91,000 miles, Black (accident)
2001 E220 CDi Advantgarde
1998 C230K Sport
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Old 09-13-2004, 12:42 PM   #4 (permalink)
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RE: c280. running rough idle.

Could this be similar for a 2000 C280? I ran the carb cleaner/fuel injector cleaner but i dont see why those would get dirty when i use 98 octane all the time. Is this bad. Any help is useful and appreciated.
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Old 09-14-2004, 01:56 PM   #5 (permalink)
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RE: c280. running rough idle.

Quote:
mjtray - 5/21/2004 5:19 AM

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.

Good luck

Mate,

How do you actually clean the throttle body? And would you mind pointing me where it is. MB engine bays are pretty confusing to look at.
My C280 also "surges", and I don't know if I should start to worry. I just replaced my MAS and OVP.
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Old 09-17-2004, 07:40 AM   #6 (permalink)
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RE: c280. running rough idle.

i got the problem solved by changing the air filter, fuel filter and repair the broken part of the coil
wire
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Old 04-01-2008, 07:11 PM   #7 (permalink)
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Severe roug idle, 94 C280

Quote:
Originally Posted by mjtray View Post
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.

Good luck
I thought the 94 C280 was a W202 motor. I have heard it told that the M104 and W202 are very similar as well. Either was I am having these exact same problems but my 94 C280 is a W202 and is injected, not a throttle body to my knowledge. I cannot see any throttle body and my air filter has no visible TBI unit near it. Any help would be completely appreciated.

Cheers,
GP
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Old 04-02-2008, 08:25 PM   #8 (permalink)
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Quote:
Originally Posted by chemical_dreams View Post
I thought the 94 C280 was a W202 motor. I have heard it told that the M104 and W202 are very similar as well. Either was I am having these exact same problems but my 94 C280 is a W202 and is injected, not a throttle body to my knowledge. I cannot see any throttle body and my air filter has no visible TBI unit near it. Any help would be completely appreciated.

Cheers,
GP
W202 is the body code. And rough idle could be because of many problem. Do not ignore it, the CEL may try to tell you something, try to check if the head gasket is okay. My C220 had a leak in gasket and it let things into it and caused the hydrolock and blown the engine.
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Old 01-12-2009, 05:27 AM   #9 (permalink)
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Date registered: Dec 2008
Vehicle: E36 AMG & C36 AMG
Location: Midlands, UK
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Quote:
Originally Posted by mjtray View Post
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.

Good luck
nice 1 i googled this problem and found your post! my wife was really upset about this merc i got her! C280 1996 (engine wiring harness fixed from factory).

had all the same problems which was posted~! last week the car was really bad! good job i got the E36 AMG which has the 3.6 litre M104 engine. one of the coil packs went bad, so i took one off my car. bit of swapping around. but that wasnt all! the car was idling and bouncing and cutting out. changed the regualtor on the alternator, the old one was well worn out! the car got better but still not right. still jerky! thought that the OVP had been changed from the factory by now on this year, im pretty sure it has been. so i got the carb cleaner from halfords £4.98 sprayed half of it down the throttle body and hey presto!! jobs a good one. i remember doing this to my 1986 300E m103 engine but had to change the OVP as well. but i completly forgot about it! this post brought it all back.

the throttle body and butterfly flap was stinking full of black carbon build up, about 2mm thick.

the car has 153k miles on it and now drives like it did from new. wow! like a dream!

hope this helps any one else who has cutting out problems on thier mercedes e class or c class (280, 300, 320, E36/c36 etc)

paul
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Old 01-12-2009, 06:23 PM   #10 (permalink)
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here is a really old picture of my engine, however it serves the purpose. the part circled in red is the throttle body. you take the black hose off by undoing a clamp. when you can see the butterfly valve, spary the cleaner around the edges to remove the black carbon. feel free to open the valve with your hands as well ti spray the ring on the pipe. i did this with my car off. you dont want unfiltered air going into the engine, also the maf not see airflow.

sorry if my drawings are confusing. haha
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