Another Misfire Thread

[Gray035]

Update:

I replaced the CCV. The PO had replaced only the hose from the bottom of the CCV to the dipstick tube and the others were very brittle.

I also changed the throttle body gasket while I was in there.

And the ICV.

Finally, I found some bad vacuum hose section leading from the auxiliary fan pump to the back of the manifold, so I replaced those as well (the small 1/8' style lines that connect to the plastic tubing).

None of these things appears to have made a real difference. The idle is still rough, even when there is no CEL or pending code, which makes me believe it is misfiring almost all the time now. But the issue seems only to present itself at idle. Never any problems when the car is in motion.

I think next I will do a compression test and then swap the injector and check the fuel pressure.

This problem is really annoying.

I read on another thread by SarTech that he had almost the same issue I am having and he never found a definitive solution, but that when he did an engine flush and changed to a slightly higher viscosity oil his issue seemed to subside. I may put that on my list as well.

As always, if anyone has insight it would be appreciated.