Quote:
Originally Posted by cn90
Multiple misfire codes usually point to air leak.
The #1 culprit is the rubber boot feeding the throttle body.
The cracks are usually on the underside, which you can only see once it is removed from the car.
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Thanks, agreed, but in my case it started with just #3 misfire and open injector circuit, so I discounted rubber boot as it was not a random misfire, but consistent, so I ordered new injector, but then #2, #4 came up with same codes, PO300 and PO303, 302, 304, so now I don't think all injectors would be open circuit at the same time. So I was curious if anything else could cause problem. I checked boot, no vacuum leaks detected anywhere, so I am stuck. If all cylinders had random misfires, I would agree.
Thanks,