1990 Pontiac Grand Prix - Answered Questions & Fixed issues

TPS - throttle position sensor .

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I have the same car. My solution was to first test the TPS, throttle position sensor, test is on Autozone site. 2nd, test the three wires that go to the TPS for integrity(simple volt meter set to ohms scale- readings should be close to zero if the wires are intact and not broken or touching a ground.) TPS sensor runs around 17 to 28 dollars. Ill bet you a dollar to a doughnut hole thats your problem my friend

more than likey in the dash board side and if not there under the hood - but check you owners manual first for the info

check and change the sensor on the transmission always check your wire harness for damages

There is an adjustment on the side of the trans that changes how it shifts. Try looking online about it.

yes...if you car is a 6 cylinder..then there are 6 plugs...just find 6 identical wires that all murge on one device (ignition coil) follow the wires to the other end where they are connected to the spark plugs... just pull the wires loose..then unbolt the sparkplug.. bolt the new one in.. then reconnect the wires in the same spot( do 1 at a time so they dont get mixed up...

It could possibly be that there is a wore spot on your throttle position sensor (TPS). It basically is connected to the cable running to the gas pedal and tells the computer how much you're pushing down on the pedal.If you find that it's bogging down more and more often (like when you need more power climbing hills and never really gets going), it could be that your catalytic converter is clogged, but this will eventually throw some check engine lights.

adjust idle up adjust up untill no problem idling while in gear use 2 people some one in car braking

Could be clog catalytic converter.Tune up fuel filter,coils,air filter.

Could be low fuel pressure, a vac leak, or a faulty throttle position sensor. If the check engine light is on you would check the computer for trouble codes next.

recheck the spark plugs you put in you might have cracked one putting it in

If the car is cranking, the neutral switch is ok. you need to check for fuel to the injectors, which you can do by spraying starting fluid into air cleaner ( brake-cleaner or carb cleaner also work for this) if still no start, check for spark. If no spark, check coils and spark plugs. also commonly these cars loose the crank sensor due to failing harmonic balancers. you can check this by looking at the lower engine pulley while someone turns over the engine. if the pulley is loose or moving up and down, start there.

It will if the coolant is in the cylinders stopping the engine from turning, or if the spark plugs are wet

This car doesn't use a Mass Airflow Sensor, it uses another way of measuring the air entering the engine.The problem you have is likely caused by the problem listed below.

ngine stalling issue at low speeds

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

It can be faulty fuel regulator or ECM not controlling fuel pump.The fuel pressure regulator and ecm needs to be inspected.For more details,go through the help links.Click the link below:----ECM misfueling Engine? http://technoanswers.blogspot.in/2012/03/ecm-misfueling-engine.html----------How to relieve fuel pressure? http://technoanswers.blogspot.com/2012/01/how-to-relieve-fuel-pressure.html---------- Refueling problem? http://repairhelpcenter.blogspot.com/2012/01/refueling-problem.html---------- Vehicle consuming more fuel? http://repairhelpcenter.blogspot.com/2012/01/toyota-tercel-consuming-more-fuel.html=-------------------- How to maximize fuel economy on your vehicle? http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html----------This will help.Thanks.

i think it is in the air intake hose near the throttle

It all depends on how detailed you want. The simple way to explain it is to remove the door panel. remove the bolts securing the window regulator to the window glass. Disconnect the window motor electrical connector. Remove bolts securing the window regulator to the door panel. Remove the window regulator. Reverse procedure to install.If you need more detail than that - like step-by-step instructions with diagrms, I recommend alldatadiy.com. There, you can gett ALL the service information for your vehicle for a small anual fee.

Check your fuse block to see if the fuse is burnt. Check in the gloveboxand under hood. It may also be a bad fan relay located in the block.