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HondaPlatinum
HondaPlatinum, A Technician
Category: Honda
Satisfied Customers: 11334
Experience:  13 year honda platinum level
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Yukon: 2006 gmc yukon denali. 152k mi. P300 code out of the

Customer Question

2006 gmc yukon denali. 152k mi. P300 code out of the blue. Changed plugs, wires, maf,air filter, fuel pump. Checked injectors and all are functional. Had exhaust mafia old leak (broken bolts) pulled head to get stud out and noticed front cyl seemed to be firing as noted by carbon, second a little less far back cylinder the plug was like brand new. This is the drivers side. Replaced other side exhaust man gasket last summer. Been running fine until last sunday. Any advice greatly appreciated
Submitted: 1 year ago.
Category: Honda
Expert:  Dave Nova replied 1 year ago.
Do you feel the engine misfiring while running?
Customer: replied 1 year ago.
Yes wont idle and very rough at higher rpm
Expert:  Dave Nova replied 1 year ago.
Any codes other than the P0300?
Customer: replied 1 year ago.
No
Expert:  Dave Nova replied 1 year ago.
Is the egr valve stuck open?
Customer: replied 1 year ago.
Ill check
Expert:  Dave Nova replied 1 year ago.
Okay, let me know when you are able.
Customer: replied 1 year ago.
No egr valve on this engine
Expert:  Dave Nova replied 1 year ago.
Is problem present more with cold engine or after warming up?