CEL Cyl 8 misfire
Architect,
Welcome to DF. I don't know of any smaller size for spark plugs. Just 13/16" and 5/8". You might want to take a pick or compressed air nozzle and blow or scrape around base of plug. (wear google when using compressed air). Something is keeping socket from going down far enough. Should be 5/8 if it has the correct plugs in it.
Welcome to DF. I don't know of any smaller size for spark plugs. Just 13/16" and 5/8". You might want to take a pick or compressed air nozzle and blow or scrape around base of plug. (wear google when using compressed air). Something is keeping socket from going down far enough. Should be 5/8 if it has the correct plugs in it.
Thanks for the help.
Well a little more work done this afternoon, and another discovery.

I am surprised that I was only getting an occasional cyl 8 misfire. SHould have been getting a 4,6, and 7 misfire as well. Wires were Mopar, and ad neglected as this truck was, I am reasonably sure they were factory install.
The fun never ends....

I am surprised that I was only getting an occasional cyl 8 misfire. SHould have been getting a 4,6, and 7 misfire as well. Wires were Mopar, and ad neglected as this truck was, I am reasonably sure they were factory install.
The fun never ends....
Put on MSD rotor and cap with brass terminals. Also MSD 8.5 mm wires and new plugs.
Darn thing won't start. Checked fuel pressure - it is 49 lbs. Injectors getting pulse (MTG 2500 testing). Going to check for spark next. Acting like no fire. After a few seconds cranking, oil pressure comes up and and I get a "check gauges light" and ABS light briefly.
Darn thing won't start. Checked fuel pressure - it is 49 lbs. Injectors getting pulse (MTG 2500 testing). Going to check for spark next. Acting like no fire. After a few seconds cranking, oil pressure comes up and and I get a "check gauges light" and ABS light briefly.
Do as I eas getting ready to check spark, I noticed that the control wire connector to the bottom of coil was dangling. Note to self: although small and insignificant in appearance, this item may actually need to be connected.
Truck cranked right up, and is idling smotther than it has since I got it. Gotta love it when a plan comes together. Between plenum being shot, cap being corroded (see photo in above post), original wires, and worn timing chain, it is hard for me to believe it ran as good as it did.
Flushing coolant system right now, then a test drive, then load SCT tune.
Hoping for noticeable improvement still!
Thanks everyone for all the help - with this, the transmission, and other adivce such as tuner, HS rockers, and other questions I have asked. You guys are really great!
Runs like a new truck. Idles smooth (although a little fast) and runs like a stirped a**** cat!
Last edited by gdstock; Oct 30, 2011 at 08:37 PM. Reason: UPDATE:











