[buckgnarly]

Trying to figure this one out for a friend, get a cylider 6 misfire and injector circuit open code.
Happens when...
Hot
Under slight load (like uphill on highway)


Never when...
Cold
high RPMs

Switched out injectors, still remains only on 6. Wrapped injector 6 in header wrap to prevent heat from manifold reaching it, no go.
Plugs are fouled with ash/soot.

Doing a compression test tomorrow, hoping it's not valve related.....any other thoughts?

 

[Skinny Pedal]

I'd say if its happening when hot and not cold its an O2 sensor issue. Sounds like there is an issue when switching from open loop to closed loop, which would bring in the O2 sensors.

 

[SGMongoose]

rotate the valves on that cylinder

 

[SGMongoose]

rotate the valves on that cylinder

 

[buckgnarly]

I'd say if its happening when hot and not cold its an O2 sensor issue. Sounds like there is an issue when switching from open loop to closed loop, which would bring in the O2 sensors.

No codes for the O2... :?

Doing the compression test tonight, that will tell a lot...or a little I hope!

 

[JimmyB]

could be a bad injector....i want to say there was a TSB at one point about heatsoak on the injectors causing failures on older models...not sure if the 03's are in that or not.