My brother had a '92 Grand AM with the Quad 4 for a while. I think the entire car was a lousy design!! One problem after another, and yes it had a bad catalytic converter, and had no power at all, could barely climb a hill. The car looked nice though. But considering we gave $100 for it and sold it for $400, I guess that wasn't bad.
That era of Grand Ams were definitely pieces of crap! Our dealership owned a Pontiac franchise during that time, all mixed in with our Lincoln Mercury and Toyotas. After about 4 years we dumped Pontiac. My body techs hated to work on them just as much as the service dept. Total Crap!
Glad you think that of my daughters car Bite me Ray I need to put the hollow can back on tomorrow and see what it will do. I am ordering the one I showed previously to put on when I get it right. I thought I could drill it a few times but it just kept crumpling so I had to clear it all out...
Some guys wake up all refreshed and full of jokes . My daughter did say she would trade me when I finish the Comet. I told her I might just do that, because she would probobly have a new car by the time i'm done . She said "as long as it has ac" :16suspect...
Now I have the exaust breathing nice and clear I can get it up to 65mph going down hill, 45 going up . Feels real slugish when I accelerate and I have to crank the heck out of it... also feel a stall cruising and steping on the pedal. TPS?... Coolant sensor? Ideas welcome...
Gas filter/fuel pressure regulator leaking(pull the vac hose off it,if theres gas in the hose or weeping out the vac nipple its bad)Fuel pump/bad plugs.Is the throttle body clean??? if not scrub it out and see what happens.Good luck Gene.Those cars are evil.
Just came back from a test drive with my scanner hooked up. No codes came up then I punched it, very slow response and still nada. I go to park and notice the lean code is on, not sure when it came on tho. I stoped paying attention the last two miles or so. I'm starting to think fuel pump. I think I will swap the regulator just for grins. I have all the parts still on the origional motor, either off or on but somewhere in the garage. Sure wish I had a fuel pressure guage. Maybe i'll invest in one tomorrow, I gotta get this car fixed.
is it possible that cherry red exhaust killed the O2 sensor and now your getting a bad air/fuel mix and its causing a lack of power?
I thought that so today I changed it with the one from the origional motor. It does switch and I see counting on the scanner.
Sorry, I didn't mention that I already did that. I won and bought a pcm for like $10 on ebay and I even tried that before I drug out my scanner. No difference...and no check engine light.