97 C280 problems
08-13-2003, 09:43 AM
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97 C280 problems
My C280 started acting a little crazy lately. 
For the past couple weeks I noticed the car does not idle very well. When stopped and in gear, the idle keeps varying between 750 and 450 rpm and it feels alsmot like the engine is about to stall. When I shift to neutral, the idle goes higher but still varies a little.
Last week while driving home, the engine started running very rough and the CE light came on. I scanned it and came up with cylinder 6 misfire. The plugs have never been replaced so I bought a new set and replaced all 6. The car ran fine for a couple days, then yesterday the same thing again. I scanned the codes, same misfire, cleared it and its back to OK for now but still has the rough idle.
Is there anything else I can check in the car? Could this just be a case of bad gasoline? I'm thinking I should put some fuel-injector cleaner in with the next fillup.
The car has only 30k miles on it.
Also, does anyone know if there is a service manual available for these cars? I plan to do all my own maintenance on it and a manual would help. For one thing, how do you change the trans fluid?
Thanks for the help.
For the past couple weeks I noticed the car does not idle very well. When stopped and in gear, the idle keeps varying between 750 and 450 rpm and it feels alsmot like the engine is about to stall. When I shift to neutral, the idle goes higher but still varies a little.
Last week while driving home, the engine started running very rough and the CE light came on. I scanned it and came up with cylinder 6 misfire. The plugs have never been replaced so I bought a new set and replaced all 6. The car ran fine for a couple days, then yesterday the same thing again. I scanned the codes, same misfire, cleared it and its back to OK for now but still has the rough idle.
Is there anything else I can check in the car? Could this just be a case of bad gasoline? I'm thinking I should put some fuel-injector cleaner in with the next fillup.
The car has only 30k miles on it.
Also, does anyone know if there is a service manual available for these cars? I plan to do all my own maintenance on it and a manual would help. For one thing, how do you change the trans fluid?
Thanks for the help.
08-13-2003, 02:35 PM
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It sounds like you could possibly use a tune-up. How many miles are on the car? Just replacing the plugs is sometimes not enough. You may need to put new wires on it as well. Also check the dist cap & rotor to make sure they are in good shape.
If the tune-up doesn't help, it is possible that there is a vac. leak somewhere that is causing the rough idle, but the misfire code would lead me back to the tune-up idea.
Check with your dealer to order the repair manual. It is a bit more expensive than a Haynes or Chilton manual, but it goes into much greater detail.
If the tune-up doesn't help, it is possible that there is a vac. leak somewhere that is causing the rough idle, but the misfire code would lead me back to the tune-up idea.
Check with your dealer to order the repair manual. It is a bit more expensive than a Haynes or Chilton manual, but it goes into much greater detail.
08-13-2003, 04:27 PM
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hajami, when you replace the plugs make sure you replace the rubber boot (plug end) to the plug. they are known to crack and give you the misfire codes. they cost 2-3 dollars each.
delta
delta
08-13-2003, 05:06 PM
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The car has only 30,000 miles on it but is a 97 model.
What would I need to change/replace for the tune-up?
For the rubber boots on the plug wires, are those part of the wires so would they be replaced with a new set?
For the manual, I can't find one at either chilton or haynes. Even Mercedes doesn't offer one for the W202.
What would I need to change/replace for the tune-up?
For the rubber boots on the plug wires, are those part of the wires so would they be replaced with a new set?
For the manual, I can't find one at either chilton or haynes. Even Mercedes doesn't offer one for the W202.
08-18-2003, 02:19 PM
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MB must have some manual for their service techs to look at. You should ask them what their techs are using and tell them to order one for you. I did the same for my Lexus and it was well worth the $300 they charged me for it. You may also be able to find some basic info on CD - try eBay for the CD.
