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rpmdiag
rpmdiag, Tech and Instructor
Category: Chevy
Satisfied Customers: 7054
Experience:  Since 1975
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Have a 2008 Chevrolet hhr missfire on cyl 1 only at startup

Customer Question

Hi have a 2008 Chevrolet hhr missfire on cyl 1 only at startup code is 301p now once engine warms to around 180 deegrees missing is gone. Is there a senser that could cause this
Submitted: 5 months ago.
Category: Chevy
Expert:  rpmdiag replied 5 months ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Expert:  rpmdiag replied 5 months ago.

The fuel injector is the problem, it's probably semi-plugged or has high resistance. You can test it COLD and compare it to the others and if the resistance is good, then the injector is partially plugged.

Thanks, Ron

Expert:  rpmdiag replied 5 months ago.

Hi, I'm just following up with you to see if you have any more questions.
Thanks, Ron