sohfast94 wrote:O2's are switching, MAFs reading, trims looks to be in spec. What's the issue?
Thanks very much for looking at it
Car has a stumble/hesitation and it's driving me nuts.
Two weeks ago while on the frwy, car was running pretty bad with a bad stumble/hesitation.
Pulled coil cover and found the plugs and coils saturated in oil. Some coils were damaged/cracked (I posted pics too) and at about this time, I got a CE light P0304 (cylinder 4 misfire). Turns out that #4 plug was rusty and in bad shape.
Replaced the plugs
Replaced the COPs (coils)
Cleaned IAT sensor
Cleaned MAF sensor
Stumble/hesitation persisted and I began to notice a rattle sound that seems to be related to RPM, so I called a tech buddy to come over and plug in his diagnostic equipment. He found bank 2 was lean and the O2 readings were all over the place. Pulled plug #6, checked out the piston (cylinder #6), and it was wet/oily. He suggested replacing the plug grommets/seals for the valve (cam) covers, all the gaskets and suggested replacing that injector as it could be bad.
Sourced a brand new set of 24lb FRPP injectors M-9593-LU24 (yes they're discontinued, but found a whse with a set in stock).
Over the weekend, I did this:
Replaced Fuel filter
Replaced Injectors
Replaced Valve (cam) cover grommets/seals
Replaced Valve cover gaskets (yes the hydroboost was a bitch)
Checked the Cam position sensor, seems good, chains guides and everything in the head seems fine.
Car still stumbles/hesitates
Here is a screenshot of the DV in the dynograph mode and I was not certain if the bank 2 (pink) should be reading like that?
