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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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P0304 code, yes cyl 4 misfire, 08 gmc seairra 5.3 ly5

Customer Question

p0304 code
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: yes cyl 4 misfire
JA: What is the model/year of your Chevy?
Customer: 08 gmc seairra 5.3 ly5 engine
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: yes
JA: Anything else you want the mechanic to know before I connect you?
Customer: replaced cyl head, coil injector still skipping
Submitted: 2 months ago.
Category: Chevy
Expert:  david craig replied 2 months ago.

Hi Im David, thanks for visiting the site. so you replaced the #4 coil and #4 injector and are still getting p0304 correct?

Expert:  david craig replied 1 month ago.

just wondering if you need further assistance

Expert:  Gary replied 1 month ago.

Hello there,

Have you run the engine with that valve cover off?

You may be surprised to see a valve not operating on that cylinder.

Very common.


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