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1991 GMC Sierra - Page 5 Questions & Answers
Gas flow into the carbuerator
I didn't think that a 91 Chev still had a carburator but if that's what you have then the first thing you should do is replace the fuel filter. It is hiding behind the large nut on the front of the carb where the fuel line goes in. If that doesn't cure it I would say you are going to have to rebuild it because it sounds like there is dirt inside it. The only way to clean that out is to take it apart. If you have to do this your best bet would be to take it to a shop that specializes in this work. Carbs are like voodoo, only a few can make them work right. Hope this helps.
I have a 1991 GMC
I would go to a salvage yard and get the heater controls out of a salvage vehicle.
I have a 1988 GMC
Did you put the correct fluid type in? Check to make sure that you didn't bump any wire connections at the transmission. Check to make sure that the shift linkage is hooked up correctly. Did you make sure that the filters were exactly the same? Some transmissions will have a deep and shallow pan option. Did you get the filter installed correctly. Your question lists two years in it. If it's a 1988 it is possible I think that it may still have a vacuum modulator on it which could be messed up or the vacuum line disconnected.
I have a high idle
With the TBI, the AIC solenoid can get stuck and cause problems. It's on the passenger side of the TBI assembly and should have a four wire harness attached.
1991 GMC 2w 4.3L 4speed
I have the same problem with my daewoo because the switch underneath and on top of my brake pedal has a push in type plastic nail so this switch might need to be changed. You should also check all fuses to see if any blowned but if any are blowned that you should have a short somewhere that is making this fuse blowned.
Electric window wont raise. how can i get it to
you have to pull the door panel off and i would first test the motor make sure it is getting power and that the motor really is fried to do that just take a test light hook it to a good ground and poke wires until you find the power if your not getting power then you need to trace that wire and find out y not, but if you are getting power then try to pull/push up on the window as you use the switch to roll it up to help the motor that might not be strong enough to lift the window, if that dont work then you are going to have to unhook the window motor from the door and the window you may not have to take it completely out just enough so that the teeth on the gears arent touching anymore then push the window up into place and bolt the motor back into place to hold the window were it needs to be, or if you have the money check the wires first make sure there getting power and it is the motor and buy and new motor and install it while you have the door all apart and the motor already halfway out.
Does a 1991 gmc 1500
No, it does not. I cannot find a cabin air filter listed for a '91 GMC Sierra 1500. Sorry :(
Windshield wiper will not shutoff ostays on long
You probably have either a bad switch or a bad wiper module. The modules are common for failing and are easy to replace. Locate the wiper motor and on it is a black plastic cover held on by 3 or 4 torx headed screws. Unplug it, remove the screws and cover and then you can remove the module and replace it.
1991 GMC Sierra heater switch
you need to look for a short in the wiring or either the panel itself....
what it sounds like is the panel is overheating and shutting down
91 3/4 ton 4x4,454.idle falls
You may have a body throttle position senson. You need a scanner to confirm that. You may have a vacuum leak somewhere around the throttle body. You may have a fuel pump getting weak so I would check fuel pressure. You may have an EGR valve that is partially stuck open.
Back up lights stay on
sounds like the backup switch has failed, It should be mounted on the
transmission with two wires going to it. Runs about 5 dollars online.
I was driving down the
It could be that since the column moves that much it could be that a connector came loose or a ground wire broke but it sounds like your problem is in the column.
I have a 91 gmc
Depending on the wine itself ; you may be able to hear weather it is coming form a front belt or a slipping in the transmission. I would check all fluids and go from their. Sometimes the idler pulley will make the same sound if the belt is worn beyond limit .But usually it will tick if the bearing isn't worn..............Hope this helps.
How do I adjust the
tps or throttle position sensor is not adjustable. it only has 2 mounting holes and is preset from manufacturer
When shifting into four wheel drive the fuse blows
There are 2 switches (one on top of the transfer case left side above shifter) this then sends power to the electric actuator to engage the front axle. Quite often the actuator is internally shorted causing fuse to blow. I'm sorry I don't have a schematic in front of me. The second switch is on the front axle and will illuminate the 4wd light when engaged. It could be shorted but won't inhibit 4wd operation (its a separate circuit). Remove the connector at the front axle actuator and jumper it directly to battery (using a fused jumper). if it operates, and fuse doesn't blow, then you have a wire chaffed to ground. Most often its near the front axle harness that gets rubbed thru. If the fused jumper blows then obviously the actuator is no good. I hope this helps some.
How to replace distributor
remove the air cleaner and mark where the plug wires are on the distributor cap. if you get lost the firing order on the v8 is 1-8-4-3-6-5-7-2 remove the distributor cap. unplug the distributor and using a white grease marker mark where the tab on the rotor is pointing. i usually make sure its where i can mark the intake so i can line it up later. go to the parts store and either rent or buy a distributor tool to remove the bolt holding the lock down clip at the base of the distributor. dont let it fall Murphy law says it will fall where you cant get a hold of it lol. after removing the lock down clip the get a hold of the distributor and wiggle it back and forth while pulling up on it it should slide out. when you reinstall it make sure you line it up with tab and your mark. as you put it down in it slides into the tooth of the cam and will rotate as you slide it in so you have to be one tooth before your mark and it should slide into the mark. make sure you use the new gasket with the new one and dont over tighten the lock down bolt. good luck
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