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Old 03-03-2010, 05:47 PM
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Join Date: Mar 2010
Posts: 1
300 ce problems!

I inhereted this car from my dad when he moved the China. Super nice one too, very clean and well maintained. Now it's not running well and I don't know what to do. It started stumbling on acceleration from a dead stop only when warm. Cold starts and idle are fine. Now when in park and warm, the idle surges up and down. I changed the air filter, plugs, plug wires and engine harness. Tried some seafoam cleaner for the injectors all to no avail. Ran the codes since its a California model and got: DTC 5, 10 and 19.

I need some help on where to start and what to try next. Anyone help me out there?


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Old 03-03-2010, 07:35 PM
Rahulio1989300E's Avatar
V10s & V8s FTW!
Join Date: Jan 2005
Posts: 1,145
Hello and welcome to the forum.

Use the Search function on this forum and find what your codes mean. Once you have that information, you can narrow it down quite a bit.

I suggest testing your oxygen sensor voltage using a multimeter. Again, the search function can be used to give you the procedure and the voltage specifications a healthy oxygen sensor will return.

The reason I suspect your oxygen sensor is that you say the car starts and operates well when the engine is cold, but as it warms up and switches over to the closed loop cycle which uses the oxygen sensor (among other things) it begins to have problems.

2006 BMW M5 "Heidi" @ 106,000 miles
2005 MBZ C55 AMG "Lorelai" @ 134,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles
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