GM V8 Question...... (1 Viewer)

[Degnol]

I've got a '98 Yukon with 100K. At 90K the "Check engine" light came on, it was a miss in #4. Had a tune up done, Cap rotor wires and those pricey GM Platinum or whatever plugs. It has come on 3 times since with "miss in #4",
first time they said faulty wires and replaced them, second time faulty plug replaced it, and today cracked plug and replaced it again.
WTF is the matter with #4 cylinder and its plug-eating problem?

It is a Vortec and has run flawlessly, so I can't complain except for this.


Thanks,

ed

 

[Corbet]

checked with my GM tech, probably a bad injector.

 

[Degnol]

So, that would cause 4 plugs to fail? Hmmmmm. Does it ever make sense to replace just one injector?

Thanks for the reply.

Ed

 

[Gumby]

Could cause a lean condition that would wreck the plug. Vortecs are notorious for plugging injectors.

Who is they who are doing the work?

 

[Degnol]

Glad you chimed in here Gumby, I was reluctant to put your name in the post, but I did want your input. To answer your question, just a bunch of local savvy guys with the OBD? stuff to read codes. 1500 misfires. Only felt it today when it was a dead miss. What do you think about replacing the one injector? I routinely run SeaFoam through all my stuff, injected or carbed, so I don't think it is dirt.
Seems to me that it is something other than the plug, but did not know that Vortecs are hard on injectors. Thanks,
Ed