Misfire under moderate load....already made multiple changes. Help!
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Misfire under moderate load....already made multiple changes. Help!
I have an 05 F150 with the 3v 5.4 with 170k on it. Last fall we changed the timing chains, cam phasers (aftermarket), plugs, coils (OEM), VVT solenoids (OEM), Cam Position sensors (OEM) and swapped in a GT500 oil pump. Recently under moderate load (fairly heavy acceleration onto the freeway, pulling a large camper) I get a pretty rough misfire. Tonight I pulled the codes and it was Cylinder 5 misfire. In the past I have also had Bank 2 Over-Retarded code.
What are the next things to verify and check? I plan to clean the throttle body and change fuel filter but I'm not sure either of those would cause the misfire code?
Thanks for any help!
Dan
What are the next things to verify and check? I plan to clean the throttle body and change fuel filter but I'm not sure either of those would cause the misfire code?
Thanks for any help!
Dan
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Joined: Aug 2005
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Yup, tried that. All parts are new and seem to be functioning. Look for other things to investigate as possible reasons.
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westflgator
1997 - 2003 F150
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Nov 30, 2011 11:06 AM
