Is my logic right on? It never backfired till I gutted my cat. I suspect this would be normal. It is a 91 n/a. Also, would a new o2 sensor help this, as I am buying on along w/ a Hayne's and some brake fluid on saturday!

 

Any ideas? N/A's run rich, but is that the only culprit?

 

When I adjusted my air/fuel ratio my car ran and idled much better. No more backfiring!

 

I'm assuming you mean you adjusted idle/air adjust screw. That only effects your idle mixture, and that screw is only on 86-88 models.

 

Are you sure about the 89+ not having the idle adjust screw on top of the engine? My 89 GXL has one.

 

No, that is different. That is just an idle adjust screw on the top of the TB, that allows more air at idle. The screw natedogg is reffering to is on the pressure sensor thing, at it actually adjusts the air/fuel mixture at idle. I didn't mean to say "idle/air adjust screw" in my previous post, I meant to say idle/mixture adjust screw.

 

Is your air pump still online. If so just take the belt off of it. Try this and let us know if that was it.

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