Question about 1999 Pontiac Sunfire

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Car want start theft light is on but fuel pump will not come on

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Dealer only sorry

Posted on Sep 02, 2010

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Not sure if the alarm is causing but the things that do not allow a car to start and fuel pump to prime is ignition switch in column, ECM short or bad, main relay (ASD/MFI) fried, or bad fuel pump. That's if it cranks. If no crank then add starter, starter solenoid, or possibly the neutral safety switch is bad. Figure away to turn of alarm would be the 1st thing I would do.

Posted on Sep 02, 2010

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Posted on Jan 02, 2017

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SOURCE: car rolls over but fuel pump not kicking on theft

Try to start vehicle. Leave key in the on position until the theft light stops blinking (about 10 minutes). Turn the key off - leave off in ignition for about 10 minutes. Try to restart vehicle.

Posted on May 27, 2011

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SOURCE: CHANGED IGNITION SWITCH FUEL PUMP AN FUEL FILTER

I have no idea what kind of car you have but it sounds like you might have a resistor chip in the key and changing the switch you may not have a key with the chip or a right chip in it.
The theft light being on sounds like it has shut down the fuel pump.
You can have your key resistance checked and put a resistor in the computer to match.
Is yours a Cady?

Posted on Nov 18, 2011

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Have you anti theft system checked, that is where your problem will be.

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The anti-theft system will keep the car from being driven, so I would start there. You may need to reset the anti-theft or check the ignition key for problems.

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My theft light is flashing but my 1997 expedition wont start.The vehicle turns over but just don't start.


ANTI-THEFT SYSTEM Passive anti-theft system
Your ignition key has a unique imbedded transponder which engages engine electronics and allows the vehicle to be started. Without the use of your special ignition key, the vehicle will not start.

During each vehicle start, the coded key is read by the anti-theft system. If the key’s ID code matches the code in the anti-theft system, the vehicle is enabled to start.

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check to see if the security light or anti theft light flashes. if that is the case, sounds like the bypass for the remote starter may be causeing the no start by tripping the anti theft system. Remove remote starter and bypass system and join any cut wires back together that may be cut for remote starter. Try starting, if theft light still flashes leave key in the on position after attempted start for 15 minutes till theft light goes solid, turn off and try again. Repeat process for three times to re-learn factory theft system in vehicle. If problem still persists, then take to your local dealer to reprogram factory theft module in the cluster.

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When the crank no start happens, is the theft light blinking ? If you turn the key from the off to run position ( do not start ) does the theft light on the cluster go out ?

If not, check the key ring for other RFID fobs ( Mobil speed pass, etc ). If they are too close to the ign switch, this can mess up the RFID of the programmed key for PATS ( Passive AntiTheft System ).

If the theft light goes out, it could be a problem with the fuel pump relay. You can swap this with the trailer tow battery charge relay to test. My 2001 SuperCrew had the fuel pump relay go out at ~ 30K miles ( think that was it, it was low ).

If the relay change with the battery charge relay does not change things, is this happening with a specific fuel level ( i.e. 1/4 or 1/8 th of a tank ) ? Could be something floating in the tank that is getting pulled to the fuel pickup, blocking the fuel to the fuel pump.

The other thing , it could be the fuel pump itself, but start with the PATS check, and the fuel pump relay.

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sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered

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does it run 2 to 3 seconds? does the scurity light blinks? if yes leave the switch on after running 2-3 second wait till security light stops blinking then start if light still blinks you have wiring problem. if light just stay on you have spark and fuel check injactor pulse.always remember if you have good spark ,good fuel pressure and injector pulse car should start

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