Ok so my 98 sh lude has been running rich for awhile now. I change plugs, wires, and the o2 sensor loacted before the cat. And gave it a fresh oil change about 1000miles ago. Any other ideas?? Could it possibly be just running the rest of the crap outta my exhaust or no. Thanks.

 

how do you know you're running rich? do you have an AF gauge, or are you assuming it's running rich based on an observation?

 

I've also been running rich for a while now too. The CEL would come on and go in a few days interval. It would bog and hesitate. I'm thinking my problem is stuck injectors but who knows. Just a suggestion.

 

IAT sensor could be broken, or it may not be running rich, just bad combustion, try a compression check, if youre burning a lot of oil try a leakdown, possibly a lot of carbon buildup in the chamber, etc...

 

I do not have a gauge. Im just assuming from what i know and what i have been told. Compression check ya that sounds like a good idea.

 

are you getting a catalyst inefficiency code?

 

The only code i was getting back was my o2 sensor and that was after they put the new one in so they just reset the syustem and now my check engine light is off.