20 Most Recent 1989 Pontiac Firebird Questions & Answers


Replacing part's is not the way to diagnose ! Hooking up a OBD 1 scan tool an viewing engine sensor data parameters is . Did you do this ? , What engine ? 2.8 , 5.0 or 5.7 l
Coolant fan control switch at 238 degrees closes an supply's a ground for the cooling fan relay ,their by energizing the relay an closing the contacts sending B+ voltage to the cooling fan Or the PCM does ,depends on which engine . There is a fusible link that supply's B+ voltage for the fan it's self . A fuse for the control side of the relay . Did you use a DMM - digital multi-meter an test B+ power circuit's & ground circuit's . Maybe your best bet would be to take it to a qualified repair shop .

1989 Pontiac... | Answered on Jan 09, 2018


Double check your connections and make sure that the connections to the battery and starter a fully tightened down and are making full contact also make sure the connections are clean and show no signs of corrosion.

1989 Pontiac... | Answered on Dec 23, 2017


most of the gm columns i've encountered from that era have a set of bolts that are only accessible after removing the steering wheel and the turn signal switch mechanism, this will require a set of specialized steering column tools, these are usually available for rent from most auto parts stores, the tools are important to prevent damage to the column parts and to prevent injury, there's a spring under pretty good pressure in there, consult a factory or haynes type service manual before taking any of this apart.

1989 Pontiac... | Answered on Nov 06, 2017


probrably injectors failing

1989 Pontiac... | Answered on Oct 04, 2016


As water pumps go, this is a relatively easy one to replace...It is located n the front of the motor...behind a pulley on the serpentine belt set-up...after releasing the belt tension, you can remove pulley, the water pump is behind this pulley, the 5 bolts that mount it are usually 8mm bolt heads...this water pump is usually about $35. and available at most parts stores...Imperative that you line up the gasket before applying any lubricants...be sure it is turned correctly so that ALL holes line up perfectly...some newer gaskets have added an UP arrow...Hope this helps...You may find a video on-line. (Change thermostat and flush system with this change)

1989 Pontiac... | Answered on Sep 25, 2015


How long since a tune-up? Include air filter, fuel filter, gas injector cleaner...Also check the Idle Air Control valve on your 3.4 V-6...It can be dirty or clogged over time...Located on the air intake plenum...your auto parts store can also show you a diagram...Fuel pressure must be constant also, your Firebird is worth having the fuel pressure regulator checked, as well as the fuel pump...

1989 Pontiac... | Answered on Sep 25, 2015


I'm not sure I completely understand your question, if youre wiring the cooling fan directly to power (with the fusible link) you'll be bypassing the PCM's output to the fan relay...the PCM uses the Coolant temp sensor (CTS) as an input to determine when to turn the fan on.

1989 Pontiac... | Answered on Jun 17, 2015


If you have factory exhaust it shouldn't, if you have aftermarket headers...maybe.

1989 Pontiac... | Answered on Jun 13, 2015


For one thing, the engine computer goes into limp mode when a sensor is unhooked, and that causes it to stop using all of the data from the sensors. It uses known good values instead.
Did you check the computer for trouble codes ?

1989 Pontiac... | Answered on Mar 08, 2015


If code 53 involves the PASS system for your car, the chip in the key has failed, or the sensor in the lock cylinder, or the control module.
The anti-theft system disables the starter and the fuel injectors. You could bypass those circuits to get the car started.

1989 Pontiac... | Answered on Feb 12, 2015


have you check to make sure the cooling fan is working and not seized. this is a common problem with most cars. this is where I would start then go to the relay. the relay is usually mounted on the firewall under the hood and there is a plastic cover that covers a row of relays. don`t remember which one is for the cooling fan though, they may be marked on the underside of the cover.

1989 Pontiac... | Answered on Oct 11, 2014


it may be a bad ignition switch=try this test! ( supplies about 50% of power. put key to position 2 the oil light, brake light, charge light and all other warning lights will not function.turn key to start position, as soon as it trys to start let go of key. allow to snap back to run position. and note warning lights, if warning lights go out when switch is snapped back! switch is faulty. in this case. there is no power past switch. check all of the main fuses first!! and wiring to rule them out.

1989 Pontiac... | Answered on Apr 04, 2014


got old key place it on side of columb it should start
also try turning on ignition wait 10 min then start it should reset comp to except key but also check the manule

1989 Pontiac... | Answered on Mar 14, 2014


i would see if the wires to the plug going to the alternator are putting out any juice or the hot wire that connects to the back is getting juice.

1989 Pontiac... | Answered on Mar 03, 2014

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