Misfire Code poped up PO308

sierra4x4

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Been a long time since posted.

2000 SD4x4 stock very low miles.
I wonder what is causing this code.
One thing I have noticed is the truck usually starts quickly and now sometimes I have to crank then turn off the ignition and crank again and it starts normally.

any help would be great.
 

DaveBen

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Sorry I did not see the code in the title. P0308 is Cylinder 8 Misfire Detected. Sounds like a bad injector.

Dave
 

DaveBen

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Autoenginuity will tell you this, but I am not sure about the others. Yes, most professional scanners should tell you this. A cylinder contribution test is another.

Dave :)
 

sierra4x4

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Thanks for the help.


By the way IF i remember correctly the Cyl contributions test fails because of the crank sensor warranty replacement that ford installed for free.
 

Dogman

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The other thing is check the wiring harness going into the valve cover. The 7.3 had some problems with the wire clip busting and giving a skip to the motor. The down side is you still have to pull the valve cover anyway. Dorman sell a new update fix for this problem.
 

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