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Car Forum / Pontiac / Pontiac Fiero / May 2005fiero no start?
the fiero will start pretty easily in the mornings, when it's cold, but it'll stall, or drive it a mile or so and it'll stall, and won't restart, if you floor it, it sounds like it's firing but doesn't start. it has good fuel pressure at the check valve, good spark, where should i go? just changed the cap, rotor, plugs, wires, oil, full tuneup on it, but it didn't help. i was thinking either low compression, very dirty injectors (been sitting for unknown amount of time), bad fuel pressure regulator, or maybe clogged cat, anyone agree or have any other thoughts??  SignatureAl Do you get spark after it cuts out? Check with a timing light or other spark indicator. Do you hear the fuel pump whine when you try to restart it? It could be the pump or a heat sensitive connection to the pump. The only other item that springs to mind is the Idle Air Control. It might heat up and stop functioning. You'd see that failure any time you took your foot off the throttle, but not while cruising on the highway, for example. I'd guess dirty injectors would just run rough/dump too much fuel. Clogged cat would either stop the motor in a matter of seconds or just limit the top RPM, not n-start. Low compression won't change much with running. Low fuel pressure (not zero) idles, but won't go fast/stumbles. > the fiero will start pretty easily in the mornings, when it's cold, but > it'll stall, or drive it a mile or so and it'll stall, and won't restart, if [quoted text clipped - 8 lines] > > Al has great spark, well bright orange, fuel pump is working. i actually just pulled the tank and drained the old gas, checked all the lines, etc.. it's priming properly. stupid question but where is the idle air controller on the 2.8 fiero? i'm sure i could find it if i looked but may as well have a description before i go hunting tomorrow. Thanks for any input. SignatureAl > Do you get spark after it cuts out? Check with a timing light or other > spark indicator. [quoted text clipped - 29 lines] >> >> Al Spark should be blue, and LOUD. It should be regular as well. Hook the timing light up to the coil wire and aim it at a dark place so you can see the flashes while cranking. There should be no skipped flashes. Dribble some fuel down the throttle body, or spray starting fluid in and see if it will start for a few seconds. If so, then either the pump or the injectors aren't working properly. Have you tried pulling any codes yet? The IAC being bad wouldn't keep it from starting, just keep it from idling properly. It's a big hex-plug thing screwed into the side of the throttle body just below the TPS, it has a square plug with four wires coming out of it. A faulty O2 sensor could cause this. When started the car is in open loop and the sensor is ignored. After the car warms up just a bit the ECM starts looking at the O2 sensor and if it's reading was totally out of whack it cuold cause the engine to stall. Does it stall as you come up to a light? Will it restart in neutral or park? If so, it could be the TCC solenoid has failed. JazzMan > has great spark, well bright orange, fuel pump is working. i actually just > pulled the tank and drained the old gas, checked all the lines, etc.. it's [quoted text clipped - 37 lines] > >> maybe > >> clogged cat, anyone agree or have any other thoughts?? Signature********************************************************** Please reply to jsavage"at"airmail.net. Curse those darned bulk e-mailers! ********************************************************** "Rats and roaches live by competition under the laws of supply and demand. It is the privilege of human beings to live under the laws of justice and mercy." - Wendell Berry ********************************************************** Check the EGR valve for sticking open....... > Spark should be blue, and LOUD. It should be regular as well. Hook > the timing light up to the coil wire and aim it at a dark place so [quoted text clipped - 61 lines] > > >> maybe > > >> clogged cat, anyone agree or have any other thoughts?? checked the tps, the ics, and the agr, they all test fine, now it won't even start, if you floor it, it fires but doesn't start (except occasionally like maybe 1 time a day) SignatureAl > Check the EGR valve for sticking open....... >> Spark should be blue, and LOUD. It should be regular as well. Hook [quoted text clipped - 76 lines] >> > >> maybe >> > >> clogged cat, anyone agree or have any other thoughts?? Check the EGR valve for sticking open....... > Spark should be blue, and LOUD. It should be regular as well. Hook > the timing light up to the coil wire and aim it at a dark place so [quoted text clipped - 61 lines] > > >> maybe > > >> clogged cat, anyone agree or have any other thoughts?? |
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