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Old 08-25-2009, 02:02 PM
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Join Date: Feb 2009
Location: Bay Area, CA
Posts: 62
M103 small misfire / "pee shudders" at idle. Fuel injectors possibly?

Hey guys,

Got a slight issue here, but not a show stopper. Would like to hunt it down before it becomes anything major.

The best way I could explain the issue is the car seems to have "pee shudders" () at idle. The car seems like it shakes just a little at idle, and it's not in very quick succession, nearly 1 second between each little wobble. I have new engine and transmission mounts, and it's not the characteristic constant shaking with worn engine mounts. It's just a quick little shudder while the car is in gear and idling. When the car is moving it runs great.

The airflow sensor, ICV, EHA, plugs, wires, distributor, cap have been replaced and adjusted properly. What I have not done is go through and replace fuel injectors, their seals, etc. When I replaced the airflow sensor and fuel distributor (as 1 unit), I was tightening down the line to the injectors and one of the the injectors could "spin" in the head. Could it be a small vac leak there? I checked all the plugs, and they're looking uniform and well tanned. Fuel pump was replaced by previous owner about 40k miles ago. Not sure if the accumulator was done though, and not sure if that makes a difference here. I also have a 100k mile old fuel distributor available here that I could swap out, but I don't want to fix something that's not broken (yet).

Suggestions much appreciated.
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