20 Most Recent 1993 GMC Suburban Questions & Answers

probably a faulty temperature sender unit temp sensor unit which controls the fan)

You are well on your way to fixing this. I hope you will be successful. You may very well have to remove the whole window assembly from the door to get to the lock. I have had to. Remember just exactly how you did it, in what sequence, so you can put it back together. It took me many, many hours to fix this. Be thankful the person who jammed the screwdriver did not steal your truck, as that was the intention. God bless your efforts.

You will need a spark plug wrench and a spark plug gaper to make sure the plugs are gaped properly.

Have you checked to be sure the idle air control is working properly and also the engine temp control sw. The iac only comes on to maintain the idle when the engine is cold. The ect sw monitors the outside temp and tells the computer how much fuel to put to the engine. Hope this helps.

Could be bad coolant temp sensor.

Most cars use an auto-reset relay, not a fuse for headlights. Check wiring.... Run a new wire from switch to headlights as a test.

Yes, this is okay. Keep the cap on while actuating the MC.

If front running lights work, I would crawl under rear and find light wires and use a test lamp to find the hot wire with only running lights on, then trace that wire to find the break. If front running lights are not working, check all fuses, then check headlamp switch.

has it been tuned up lately?????? if so then adjust the idle speed screw at the carburetor....

Probably fuel pressure issue. Check for leaks, dirty filter, low fuel pressure could indicate bad fuel pump. Normally, a float would cause flooding, but a clogged jet could cause a lean / no start issue. Try some gumout fuel cleaner and a gumout spray clean of the carb and linkages before you get to far into a part issue.

ZUnder the hooed in the fuse and relay center on drivers side.

The actuator is a common problem on these models. It is located on the front axle housing. Test it for power. If it has power pull it off and see if it works, if not, clean it or replace it. Use caution when removing the bolts. Very common problem.

you need haynes repair manual for 1993 suburban it has photos and information you need to help you replace ignition switch.i am mechanic i use haynes,chiltons and gm manuals.if you are a home mechanic do it your self you need haynes repair manual it has step by step instructions to remove the steering wheel and remove lower steering column reason i say need haynes repair because your steering wheel has a air bag in it you need to see how to remove air bag in steering wheel you need to read through the entire ignition switch removal procedure if you are going to replace ignition switch with keylock cylinder you will also need steering wheel puller. you need a tool compress lock plate to remove lock plate retaining ring from steering shaft in order to get to the ignition switch in the steering column below turn signal switch.

Idle air control (IAC) control rpm idle during idle. Test it on idle with ALL electrical on full force. RPM should increase. If RPM remain the same then IAC is question.

check that the vacuum throttles are working on the carby as it sounds as if you only have 1/2 a carby working