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'07 Mercedes Misfire Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting Mojo New User Oct 1, 2012, 3:43 PM Post #1 of 4 (2413 views) '07 Mercedes Misfire Sign In Hi All, I have a 2007 C280 Mercedes with 160,000 miles, and a couple of weeks ago, I was pulling up to a stop sign and the car shuddered violently and the engine light came on and the car started shaking. I pulled the codes: Cylinder 6 misfire and Crankshaft position sensor. The misfire occurs maybe 15 seconds after starting the engine, while idling. The shaking (misfiring) is much better at higher speeds. I swapped the coil packs and spark plugs around, with no change, and replaced the wiring. I didn't believe it was the crankshaft sensor, so I took it to the dealer to try and diagnose it. On the way to the dealer, the car shuddered violently again, all the warning lights came on briefly, and then the car started running very smoothly with no misfires. However, after I parked at the dealer, the car would start again, indicating the CKS, so the dealer replaced the crankshaft sensor. Now the car starts again, but the misfiring is back. The dealership has no idea, so I came looking for help. Asking around, the valve springs on these cars apparently have a tendency to wear early, so could this be the case? Any ideas or help would be greatly appreciated. (This post was edited by Mojo on Oct 1, 2012, 3:44 PM) Hammer Time Ultimate Carjunky / Moderator Oct 1, 2012, 3:49 PM Post #2 of 4 (2402 views) Re: '07 Mercedes Misfire Sign In Quote I swapped the coil packs and spark plugs around, with no change, No change to what? I would expect it to keep misfiring but did the misfire move to a different cylinder? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Mojo New User Oct 1, 2012, 3:54 PM Post #3 of 4 (2393 views) Re: '07 Mercedes Misfire Sign In The misfire stayed at the original cylinder, sorry. Hammer Time Ultimate Carjunky / Moderator Oct 1, 2012, 4:10 PM Post #4 of 4 (2386 views) Re: '07 Mercedes Misfire Sign In Somebody is going to have to replicate the symptoms and do some testing while the miss is present to determine if it's ignition, ignition trigger or fuel that it's losing. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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