Is it better to have a higher reading from one, or a lower reading? The sensor on teh driverside manifold is giving the highest reading, thenthe stock location, the the passside sensor, but only slightly less. Black smoke out the tail pipe & plugs covered in soot.

Any ideas?

 

Just a long shot in the dark but could the regulator be flaky and giving you too much fuel pressure??? wonder if an adjustable one oculd be used to tweak the setting low to pass if someone had trouble.

Its hard on a FI car to tune much of anything without a computer/laptop hooked up with an aldl cable. Other than that you just gotta cross your fingers that it some how figures it out with the brain power GM gave it.

Matt

 

Well, pretty no matter what the reading plug will get covered in soot. Ideally, I think you would want the lesser reading, that way you see the worst of the 2, not the better giving you false security...

 

I/m talking thick BLACK soot. I haven't seen this much crap even on all my carbed cars, of which I've had about 10 yrs working on.

Oh to have a quadrajet again

 

2 oxygen sensors...? Did you swap in the SFI from the 3.4, also?

 

Nope, just acted on Karls advice & kept the 3.4 exhaust manifolds on. Now I have 3 O2 sensors

I remember reading something about what a higher reading from an O2 sensor means in teh Service manual, but don't remeber what it is right now. I'll see about it during lunch & post. 3 to choose from ya know

edit: I did a little update int he "Running liek a champ" thread, very enlightening