Why would an 89 TBI run rich? Just looking for out loud thinking...

[FWP]

[ QUOTE ]
I made a cable from a computer cable I had laying around and about $2 in parts from Radio Shack, it really wasn't that difficult, and cost almost nothing. Can't guarantee mine works yet, just that I made it. lol

Of course, right after you make one, you'll find the one you "lost" /forums/images/graemlins/smile.gif

[/ QUOTE ]That's about right, except I still haven't found the one I lost...LOL

 

[realsquash]

It is *NOT* the O2 sensor causing your problems, although after running rich for so long I'm sure it's toast. It's not the CTS, TPS, etc. It's a bad injector, plugged fuel return line, or a bad MAP sensor. It could even be a pinched wire that is shorting out. If it's the ECM/calpak scanning the truck would tell you this. Does it give any codes off?

Andy