GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello, my name is ***** ***** I'm here to help get your problem solved.
Does the check engine light flash while driving? thanks.
C0561 is common to set any time there is a performance problem. If check engine light flashes that usually means you have a failed ignition coil. You can use a spark tester to see if each coil has strong spark, replace whatever coil has weak or no spark. Let me know if you have more questions or if there is anything else I can do to help. Thanks.
It could be 20 different things but I'm pretty sure coil will take care of problem. Let me know how it goes, thanks.
Next step is a compression test, you could have a worn cam lobe. Let me know how compression goes, thanks.
Does it run rough at all times or only sometimes? What were compression readings?
new expert here i am sorry for the long wait
can you view live computer data when its acting up like current or history misfires ?