Question about 2000 Pontiac Grand Am GT

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2000 Pontiac Grand Am misfiring cylinders 2 and 3

Well ive taken it to the shot for this problem several times. one time they replaced the catalytic converter, the next the ignition control module, then the coil packs. they said they had replaced every part that could make this happen, however it is still doing it. i really need some help here, i dont want to keep pouring money into it if they cant figure out what it is.

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  • metallica312 Feb 01, 2009

    well i figured out the problem. just before all this happened i replaced my spark plugs with bosch spark plugs. the guys at auto zone said that it would work just fine. it turned out the the spark plugs were shorting out the ignition control module. i replaced them with ac delco OEM spark plugs, and the problem is fixed. thanks for your help.

  • Charlie Swadling May 11, 2010

    have you done a tune up on it?

  • Shane Peterson May 11, 2010

    what engine do you have?

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Try replacing ur sparkplugs and wires.one single bad wire can cause a car to misfire,try testin the wires, to make sure u get a good spark

Posted on May 25, 2009

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On two cylinder misfires and they changed catalytic converter in first place..firsable stop going that shop...
okey basically you need air-fuel and spark to get fire in engine..and when is misfires it should missing one of them..i saw they replaced only ignition side of the misfire and you still have a misfire..this mean you may have a bad mass air flow sensor it is sending wrong info the control module so it doesnt send enough fuel to get fire or something wrong in fuel system( fuel pump-pressure regulator-(fuel injectors are most posible) )

Posted on Sep 12, 2009

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2000 ford ranger misfire and running lean bank 1 and 2


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We own a 2000 Pontiac Grand AM, 3.4 liter, 2 door coupe with front wheel drive and recently replaced the transmission and now can't find our key set. Great start We hired a local Lock Smith who...


You can purchase new Remote Keyless Entry (RKE) transmitters from the dealer or you can order them online at the web sites listed below or several others. Your vehicle provides for programming the RKE transmitters without the use of a scan tool. Follow the instructions below.

2000 PONTIAC GRAND AM RKE TRANSMITTER PROGRAMMING

WITHOUT A SCAN TOOL

1. Close all vehicle doors. Remove key from ignition lock cylinder

NOTE: STEPS 2 AND 3 MUST BE COMPLETED WITHIN 25 SECONDS OF PRESSING THE DOOR UNLOCK SWITCH
2. Press and hold door UNLOCK switch. While holding UNLOCK switch, insert and remove the key in the ignition lock cylinder twice. Do not rotate the lock cylinder.
3. Insert the key a third time, leaving the key in the lock cylinder. Keep the lock cylinder in the LOCK position for the remainder of the procedure. Release the door UNLOCK switch. The chime will sound 3 times to signal that the programming/diagnostic mode is active.
4. Press and hold LOCK and UNLOCK at the same time on the RKE transmitter for approximately 4 seconds. The chime will sound 2 times signaling that the transmitter has been programmed.
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6. To exit program mode, turn the key to the RUN position then back to the LOCK position and remove the key. Your transmitters should now work to lock and unlock your doors.

2000 Pontiac Grand Am Transponder (direct links)

- autotransponder.com

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Showing PO420 and PO304 code


MAP sensor, Maybe, but doubt it.

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Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues
This maybe causing PO420 code to go off.
Which is:
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There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.

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Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
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