Question about Pontiac Sunfire

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Shutting off the car would turn off everything cept for the engine. put in a new ecu and now the anti theft is on and car starts and shuts off right away. how do u reset the ecu?

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My 2007 gmc envoy shut off while riding down the road I have taken it 2 places and have heard everything from my anti-theft to a seized engine. Help


Is the anti-theft light lit ? If not , not anti-theft problem . Find the crank relay in the under hood fuse / relay box . Pull the relay out of it's socket an look on the bottom of the relay , you will see four sets of numbers > 30 & 87 , 85 & 86 . Where it plugs into the fuse box Jump 30 to 87 , if engine spins it's not seized up . If it shut off how did you take it to 2 places ? Did you take it to the dealer ? Did either place check DTC'S - diagnostic trouble codes ?

Apr 16, 2016 | GMC Cars & Trucks

1 Answer

I have a 03 cavalier it starts up then shuts back off what causes it


Hi Missy , There are a number of thing's that can cause this . Fuel system problems , ignition system problems , the PCM - powertrain control module , the PCM is the engine computer ! There are multiple sensors on this vehicle as with all cars for the 80's on . From 1996 on they have more electronic modules then before , Anti-theft systems , air bags, anti - lock brakes etc.
Does you car have any lights light on the dash ? check engine ? Security ?. When you first turn on your key the dash lights light up an after 7 seconds the lights should go out , Do they ? You should check for DTC's - diagnostic trouble codes . That means hooking your car up to a scan tool . If it starts an shuts back off right away I would think a anti-theft system problem . If the anti-theft thinks it being stolen it disables the fuel injection in some cases !

Mar 13, 2015 | 2003 Chevrolet Cavalier

2 Answers

I replaced ignition switch and cylinder now car starts but shuts down after a few seconds


does a security light flash on the dash if so the anti-theft has activated and will have to be reset, synced to the BCM if I remember I think you have to use the same colour key for things to work.

Sep 18, 2014 | 2001 Dodge Grand Caravan

2 Answers

Car cranks but wont start after sitting 3 months


Sometimes if it set too long the gas went bad. You may have to drain the gas and the put fresh gas in.

Mar 01, 2014 | Ford Taurus Cars & Trucks

2 Answers

My car won't start, have had no problems it was running fine, pulled into the driveway shut it off, then an hour later it would not start. My anti theft light flashes excessively fast when I put the...


Absolutely! If the Passive Anti-Theft System (PATS) "thinks" you are trying to steal the car, it is SUPPOSED to keep it from starting. The problem is that the PATS thinks you are a car theif when you are not.
Below is a table straight out of the service manual for your vehicle. Please note that the FIRST action that must be taken for any PATS system malfunction is to scan the computer system for fault codes.


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Aug 27, 2011 | 1997 Mercury Sable

1 Answer

Turn ignition key and motor starts up, next day turn ignition key and motor just turns over and wont start. could it be anti theft problem its a 2002 f150 4 wheel drive with 4.6 liter


This could be caused by either a faulty Crank Shaft Position Sensor or the anti-theft system. Try put key in, turn to ON position for EXACTLY 10 minutes, As SOON as anti-theft light shuts off or stops flashing, then IMMEDIATELY start the engine.

Jan 13, 2010 | 2002 Ford F150 Regular Cab

1 Answer

I have a 2000 Buick Century...replaced battery...now the engine will start twice and then everything shuts down....no nothing....then light show and we start all over....is there a reboot button or do I...


this may be your anti theft pass key try putting the key in theingnition turn it to the on position and leave it there for 10-15minutes then start the car the car may have to relearn the key

Jan 07, 2010 | 2000 Buick Century

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The engine will shut down and will start again up to 15 min. later every thing will function the anti theft light will blink and the starter will turn the engine over. never know when it will do it. I...


Seems heat related so first thing to change would be the coolant sensor in the thermostat housing. This tells the ECU whether the engine is hot or cold. If faulty after 10 - 15 minutes it could over fuel and cut the engine not allowing it to start until it has cooled back down.

Nov 18, 2009 | 1995 Ford F250

2 Answers

1999 mercury cougar. won't start...cranks...battery ok.


V6 ? 4CYL? Have you verified SPARK? Did anyone check the "fuel pump inertia switch?" Its in the right front kick panel. If it was a "Anti-theft Issue" the light would be on or flashing.

Nov 03, 2009 | 1999 Mercury Cougar

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