I know we have some GR8 mechanical minds here, so please mull this over and tell me waht you think:
Car in question is a 90 Caddy Fleetwood. 4.5 V8, MPI injection, HEI distributor ignition.
History of problems:
Car seemed to REALLY be down on power. Cat converter must have gotten plugged up. Cat blew apart on way home from work, drove car to shop for repairs.
Had following work done: complete new exhaust system, new 02 sensor, tranny filter and fluid change, oil change, new plugs, cap, rotor, and wires.
Got car back, drove to work. Car stilled seemed to be down on power. Got within a few blocks of work, and exhaust system fell down due to what seemed to be broken rear hanger. Had car towed back to shop.
Had muffler/tailpipe/rear hanger replaced. Picked up car, drove it a few miles back home. Car STILL seemed to be way down on power. Called shop, was told to bring car back.
Took car out on highway to see how bad performace was; could barely get above 60 MPH. Drove car back into town to get to shop, rear rubber exhaust hanger CAUGHT ON FIRE and dropped exhaust. Put out fire, limped car to shop, and dropped it off.
Now, I'm trying to figure out this mess, and I'm focusing on a couple of things: lack of power, and the exhaust getting so hot by the muffler that it caught the hanger on fire. I'm thinking timing must be waaaay off: that could cause car to run crappy and build excessive heat in the exhaust. The distributor must be computer controlled, I don't know if you can adjust the timing by unplugging the distributor like on a 3rd gen F body.
Don't know, don't know, don't know...want do YOU think???
