Quote:
Originally Posted by jfreezn
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Does the engine EVER run smooth at idle, like cold or hot? Or damp days or dry days? Have you tried driving it without the fuel tank cap on? What about misting the plug wires with water in the dark, any external sparks you can cordinate with the misfire? Is the spark plug you mentioned the correct plug for that engine? I know that trying to upgrade plugs, especially Bosch, is NOT a good idea in a Mercedes.
I am betting it is the ignitor, which I believe has a tired capacitor in it.
Good luck, and be sure and let us know what fixes it!
Jim in Phoenix
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For the first 5-10 seconds of starting it in the morning it has no misfires...and then it slowly kicks in. After that, there are no correlations between softer/harder misfires. I know before we did the Valve Stem Seals, when the AC was turned on, (aka more engine temperature), it used to misfire harder...but since fixing that, I haven't noticed it shake harder.
It's difficult to say because it differs every day regardless. There is no consistency at all.
Like tonight on the way home from school -- Absolutely beautiful to drive. The power was quick and it felt really responsive. Other days its feels slow to respond and doesn't want to really want to accelerate faster than it has to.
As for the plugs: Yes they are the Bosch H9DCO's. I scowled long and hard for the non-resistor spark plugs (one site claimed to have them but sent me resistor ones(yes very angry when I got them)), until I found mercedesshop had them on special order