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Car Forum / Pontiac / Pontiac Fiero / June 2005stupid fiero still no start
88 formula v6, hardly ever starts, if on odd occasion it does, it runs fine unless you let it idle then it stalls out. generally though, it will not start, it'll crank, if you give it gas, it'll fire, but it will not start, has good fuel pressure at the test point, has good spark, haven't checked compression yet...this thing is pissing me off.  SignatureAl > 88 formula v6, hardly ever starts, if on odd occasion it does, it runs fine > unless you let it idle then it stalls out. generally though, it will not > start, it'll crank, if you give it gas, it'll fire, but it will not start, > has good fuel pressure at the test point, has good spark, haven't checked > compression yet...this thing is pissing me off. A bad or disconnected MAP sensor can cause this, as can a faulty TPS. Have you checked for stored trouble codes yet? JazzMan 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 ********************************************************** yeh, it just reports everything is fine :-/ SignatureAl >> 88 formula v6, hardly ever starts, if on odd occasion it does, it runs >> fine [quoted text clipped - 9 lines] > > JazzMan your cold start valve or the sensor is not working will it start right up if you spray either in the intake? if so check out those good hunting Ace > 88 formula v6, hardly ever starts, if on odd occasion it does, it runs fine > unless you let it idle then it stalls out. generally though, it will not [quoted text clipped - 5 lines] > > Al it doesn't start on ether. just sort of starts when it wants. SignatureAl > your cold start valve or the sensor is not working will it start right up > if you spray either in the intake? if so check out those good hunting Ace [quoted text clipped - 9 lines] >> >> Al When it's not starting is there a lot of gas from the exhausts? How's the timing? > it doesn't start on ether. just sort of starts when it wants. > [quoted text clipped - 15 lines] > >> > >> Al Check your Idle air controller. (IAC). It may be plugged with junk, or not responding to inputs from the computer. Try a can of either brake cleaner or carb cleaner. The IAC is a small stepper motor that controls how much air the mixture gets at idle, and at start. TPS - Throttle Position Sensor Another thing you may try is holding the pedal to the floor momentarily (1-2 sec) while cranking. This is 'trick' that is programmed into the computer to clear a 'flooded' condition. You can use it to get more air to the mixture upon cranking, the computer is programmed to limit fuel to the injectors with a full TPS position while cranking, so it may be a hit-miss. > 88 formula v6, hardly ever starts, if on odd occasion it does, it runs fine > unless you let it idle then it stalls out. generally though, it will not > start, it'll crank, if you give it gas, it'll fire, but it will not start, > has good fuel pressure at the test point, has good spark, haven't checked > compression yet...this thing is pissing me off. |
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