I have a 1992 pontiac Grand Prix SE with the 3.1 V6and i dont know whats wrong with it!?

Question

1992 Grand Prix...starts fine runs fine ...sometimes.
when I first bought it i had to put a new tranny in it and then it ran like a million bucks,but then a couple of months after that it started to bog down/lose power like it's not as fast as it was sucking gas and all of that crap. i don't get it because some days it will run fine but most of the time it wont i have no idea what it could be sombody help lol

Answer 1

Try changing the oil, the plugs, air filter, check the trans fluid. Basically, do a tuneup on it. Have all your seals checked out, and check your hoses to.



If you can't do it yourself, take it to Autozone, or Advance Auto Parts, or Napa, and learn how. It will save you money in the long run by knowing how to fix your own car.



It could also be the way you drive it. If you continuously drive it hard, then you're just taxing the engine and transmission. Drive carefully, be good to it. The 3.1L engine is one of the most dependable engines made.

Answer 2

Tons of problems could cause this. Air filer clogged, fuel filter clogged, spark plugs are bad, build up of junk on top of the piston and valves. It could go on forever

Answer 3

one thing you should check before you spend a lot of money on the car is to check that the ground wires on the transmission are clean and tight! if one is loose the pcm can not ground and the car will do funny things! hope this can help!

Answer 4

buy a new car, the car is 16 years plus.

possible problem:



ecm (engine control module)

fuel pump (improper fuel pressure)

fuel filter (clogged)

bad gas (water in fuel)

bad fuel injectors(clogged)

clogged air filter (dirt & oil)

egr:(exhaust gas relay) charcoal canister (can get full of fuel from topping off)

egr valve (clogged)

gas cap (loose, will cause rough idle sometimes)

bad coolant temp sensor (gives ecm false readings)

bad o2 sensor (gives ecm false readings)

bad catalyst (will cause a back flow pressure problem)

loose or missing vacuum line ( effects good or bad idle)

vapor lock (hot engine with improper fuel pressure)

faulty maf sensor (map)(mass air flow or pressure)(false ecm feed)

faulty tps sensor (throttle position sensor)(false ecm feed)

bad spark plug wires (misfires)

bad distributor cap (moisture collects in cap, fouls distribution)

bad rotor (if you have one)(misfires)

bad coil (misfires)

grounding problem with ecm (bad inputs)

faulty inertia switch (effects the fuel pump)

i could go on, but i gotta go to work now.

also, specific up there makes a lot of damn good sense.