Leaderboard

Because shops are by and large parts changers and not technicians. Its also not OBD 2 so it may as well be hieroglyphics to many at this point For something like this its IMO largely unnecessary to even poses a scantool, its a really simple EFI system. I did diagnosis on this sort of thing for many years before I bought a scantool.

It sounds like the car is dumping fuel, WHY its dumping fuel is what i'd be looking into. In order I'd check, and before anyone gives me shit i'm using the service manual as a guide. - Coolant temp sensor, probably a bit tricky to check if you don't have a scantool of some kind but if its showing -40* it will basically be dumping fuel at an alarming rate. - Fuel pressure regulator, check the vacuum line for gasoline, I'll usually take it a step further and make sure the bladder in it is good with a small hand vacuum pump, they're cheap and you'd be amazed how useful they are. if it can hold -15in its good if it leaks down immediately its bad. -Check fuel pressure at the rail and see how long after the engine is shut off that pressure drops off. it will drop off, but if it falls like a rock you have issues. - The manual says to check TPS performance, again kind of difficult if you don't have a scantool. you can kind of ghetto check with a multimeter on the signal line, that should give you a rudimentary idea if its operating linearly or not. I rather doubt this is the issue. - The manual calls out checking EGR... I think by 92' it was a digital EGR. might be a bit harder to verify if its staying open or not. you could trace the EGR valve out on a coke can or sheet gasket and make a block off plate of sorts to sandwich in between for testing if you don't have a spare on hand.