20 Most Recent 1990 Pontiac Grand Prix Questions & Answers


TPS - throttle position sensor .

1990 Pontiac... | Answered on Sep 03, 2017


You have it threaded wrong.

Google make model year serpentine belt and then click on images tab.

1990 Pontiac... | Answered on Oct 31, 2015


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

1990 Pontiac... | Answered on Mar 26, 2015


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

1990 Pontiac... | Answered on Nov 25, 2014


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

1990 Pontiac... | Answered on Jun 25, 2014


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

1990 Pontiac... | Answered on Apr 03, 2014


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...

1990 Pontiac... | Answered on Dec 11, 2013


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.

1990 Pontiac... | Answered on Nov 10, 2013


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

1990 Pontiac... | Answered on Aug 16, 2013


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

1990 Pontiac... | Answered on Apr 05, 2013


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.

1990 Pontiac... | Answered on Jan 14, 2013

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