1998 Dodge Ram

86,000 MILES • V8 • 4WD • AUTOMATIC
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MGRAFFITO1
  • MEMBER
  • 2 POSTS
When accelerating, the engine has a lean pinging sound, then the "check engine" light comes on.
The computer scan says "MISFIRE CYLINDER EIGHT"
I did a compression test on that cylinder and it was fine. The plugs are new.
I have replaced the cat converter, plenum pan gasket, wires, cap, and rotor.

Can it be the PCM? I read that there is an older TSB regarding reprogramming the PCM for these symtoms.
Help!
I neglected to mention that I also pulled the injector and the screen was free from any debris.
Although, the schrader valve on the fuel rail blew out a foamy, bubbly fuel when I depressed the stem. Is this normal? Or is it part of my problem???
Feb 21, 2009 at 10:37 AM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
Check fuel injector
check injector pulse
Feb 21, 2009 at 10:56 AM
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MGRAFFITO1
  • MEMBER
  • 2 POSTS
I neglected to mention that I also pulled the injector and the screen was free from any debris.
Although, the schrader valve on the fuel rail blew out a foamy, bubbly fuel when I depressed the stem. Is this normal? Or is it part of my problem???
Feb 21, 2009 at 11:16 AM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
Switch the injector with another
check if code move with the injector
check if you have a pulse on that injector
Feb 21, 2009 at 11:40 AM
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