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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15181
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2005 trail blazer Lt., 4.2l code p0305. #5 coil missfire,

Customer Question

2005 trail blazer Lt. , 4.2l code p0305. #5 coil missfire , valve cover gasket leaking oil , replace #5 coil, relaxed valve cover gasket, also replaced spark plugs and boots, code 305 went away, still have a miss, now I have a code p0300 mutible miss fire, I double checked torque on intake manifold bolts 85 in lb. righted in sequence. everything is plugged in , checked fuses OK. wondering if I could have a bad intake or maybe when I replaced valve cover gasket I moved the intake back out of the way , I did not remove it, maybe gasket misaligned
Submitted: 2 months ago.
Category: Chevy
Expert:  Dan replied 2 months ago.

Hello, my name is ***** ***** I'm here to help get your problem solved.

Expert:  Dan replied 2 months ago.

If intake was problem you would most likely have lean codes. Does it run any better at highway or at idle? Does check engine light flash? Thanks.

Customer: replied 2 months ago.
it has lack of power on accellerator, at idle has very distinct miss. lite stays on steady. I haven't taken it on highway .
Expert:  Dan replied 2 months ago.

With lack of power does it seem like it has a RPM limiter such as not want to go over 3000 rpm? Thanks.

Customer: replied 2 months ago.
no not rpm limiter, just lack of power
Expert:  Dan replied 2 months ago.

I'd start by checking spark strength on each cylinder, you may have another failed coil. Let me know, thanks.