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Gary, ASE Certified Technician
Category: GMC
Satisfied Customers: 16102
Experience:  GCM master tech over 25 years
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2001 GMC jimmy 4.3 L this car has a misfire in cyl. #1, I

Customer Question

2001 GMC jimmy 4.3 L
this car has a misfire in cyl. #1, I check whit the scanner in a misfire data then # ***** change all the time, tune up part are new and OEM (DELCO) the pulse in injector are ok. I replace the spark plug and wire to different cylinder and still have the same misfire # ***** compression is good about 150 PSI, please give me some clues, thank in advance.
Submitted: 10 months ago.
Category: GMC
Expert:  Gary replied 10 months ago.
I am sorry for the long waitcan you feel the misfire ?will it trigger the check engine light on with a misfire code ?
Customer: replied 10 months ago.
yes, I can fee the misfirel and and engine light is on whit a PO300 them after few cycles drive detected PO301
Expert:  Gary replied 10 months ago.
150 compression and confirmed good plug and wire correct ?how old is the cap ?
Expert:  Gary replied 10 months ago.
how are you making out ?if you have any questions please ask as i do not get credit for my work until you rate me here at Justanswer

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