conspiracy theory - every ill associated with a D1 either comes from a bad CPS or bad VSS

 

Really?
Take me to school, I am all ears.

 

Id agree somewhat. Seems to eb a good place to start for any D1! I've had 2 that have had damaged wiring sheath causing them to run like crap, and one is a 96 like both y'all above me here!

 

Hello Good People,
I just cannot seem to close this thread.
After doing a seafoam injection cleaning followed by changing the spark plugs the truck was running fine for what seemed like a couple of months, until last week I got another CEL 1316P. Everytime it came down to the replacing the cylinder #6 spark plug.
I have yet to do a compression test but what else should I be looking for?

Could this be the result of a leaky fuel injector? I recall a couple of years ago I would get some fuel vapors coming inside the cabin when first taking off any given day. If I drove the car again that day I would not smell anything. I never replaced anything and yet it smell pretty much went away. It was definitely coming from under the hood and not the rear.

As a side note the truck used to get more highway miles. This probably helped to mask some things like keeping carbon from building up. These days as in 2020 really no highway miles, just locale city driving to grocery, 5 - 15 mile trips etc.

Scratching my head...
What are your thoughts?

Thanks

 

A leaky fuel injector definitely could cause that plug to foul out. It could also wash that cylinder, accelerating wear, and cause the oil fouling as well.

 

Thanks for the response.
Just to make sure there was no typo. Did you mean wash that cylinder as to put some cleaner in there? Or did you mean watch it?

It was suggested to try a spark plug non-fouler until I can pull things apart due to the Winter ice-n-snow.

Thanks

 

"Washing" a cylinder is when a fueling problem overcomes the engine's oiling capabilities within the cylinder and causes extra wear. If you're lucky, the #6 plug is only fouling because the mixture is too rich. However the dark, wet, lumpy appearance would indicate that the plug is fouling from oil entering the cylinder due to weak rings (or valve seals, but an injector wouldn't have any affect on those).

A spark plug non fouler would really only help you if your problem was on an entire bank. It could trick the engine into leaning out, and make the #6 issue better at the expense of 2,4 and 8.

 

Thanks for the feedback.