20 Most Recent 1997 Pontiac Grand Prix - Page 8 Questions & Answers

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Was it running decent before you done the work on it.?

You can download the manual here but there is a fee.

Check wiring around the throttle motor assy on the top of the engine. This harness sometimes rubs through on hot engine surfaces.

1997 still used a vacuum modulator on the transmission which is connected to the throttle body, the vacuum line may have disconnected or is cracked and dry rotted and needs replacing.the speed sensor is on the passenger side of the transmission near where the axle goes in, it is pretty easy to change. not sure if that can cause the ABS light but it can affect shifting, can cause the speedometer to be inoperable and can turn on the check engine light.

your ignition circuit faulty check wiring from key switch to starter

No.The security system would prevent the car from cranking and the injectors from opening if the wrong key is used.

Personally ---I wouldn't spend the time & money to do soI see no benefit to thatAn auto parts store can order a bypass kit or get onlineIt is not just a different belt replacement

Could be the speedometer in the dash or the speed sensor in the transmission. That circuit would need to be tested.

Did you check the fuel pump? If you did, check for a grounded wire somewere by the pump.

I believe that both 2 and 6 cylinder show up as cyl 2 on the diagnostics tester. so you will need to check the wire and plug for both cylinders.

There is a yellow button under the dash on the drivers side. Press and hold.

It is located under the passenger side dash behind the glove box. You'll have to lay on your back in the floor board just to see it. unplug the the connector, then remove the 3 screws from around the motor. You'll need to push the bundle of wires that run across it to the side and almost force it out from there. good luck, you almost need three hands

to get somewhere to what you have might done causing the non starting,just go step by step from the time you removed the radiator to the last touch on fitting the radiator and just before starting the car. Might something you missed or something you put wrong.

on certain models wires--modules--relays gain resistence from wear-then heatup--try driving no more then an hour-then coolit a few hrs--get to a electric specialist soon n lettum run a data stream to pinpoint

have you checked the rocker switch