I have an intermittent problem. Car starts only if you apply the gas pedal. Take your foot off and the car dies. I've replaced the TPS 2X's in the last year and a half so I think the problem lies somewhere else. I've checked the wiring to the sensors and it seems to be fine.
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Re: '97 Lumina code PO122
You might want to check the wiring to the sensor for cracks, breaks, or melted spots. On the other hand, it is possible for a sensor to be faulty from the start, but unlikely. I think it is a wiring problem, remeber the fault code P0122 means a fault in the TPS circuit, not just the TPS itself, get IT??
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PO122 is a Throttle Position Sensor An APPor ETC is the pedal position sensor which is the gas pedal,all shop know that one Remember the Toyota issues a few years back NASA found nothing wrong with them Don't think you have drive by wire in 1996 Your saying no one can look up a Code,odd isn't that You can Google any codes you ever get & read for months
Take the idle air control valve off and clean the carbon out of it then reset the computer by disconnecting the ground cable on the battery for 30 seconds then start the engine.If the problem still exists then replace the throttle position sensor and reset the computer again afterwards.
I just recently have been fighting the same problem with the same make/model/year vehicle. For myself, I would drive off and on through the day and it would run fine. Then suddenly after a start it would run rough and die. I would have to wait 20 to 60 mins before it would start again. I had it checked and fuel pump was only putting out around 19 psi. It should be around 41 psi. Had fuel pump replaced and no more problems. Furthermore, now it runs so much better. It's funny how over time I didn't notice how the performance was slowly degrading. Unfortunaley fuel pumps for this car run around $300.
when you apply the brake listen for a clicking sound from brake release switch, just tap on pedal and you should be able to hear it.if not check fuses and if all o k you need a brake switch located on the pedal. if you hear th clicking sound your shifter cable is stuck.i hope this helped.