20 Most Recent 1993 GMC Sierra K1500 Questions & Answers


Check at injector wire with a test anoid light blinking while cranking engine if there is a signal to the injectors.
The + signal is from a FUSE.
and the - signal is from the ECM.
If it's an ECM problem, before changing it. Check all positive and ground at ECM pinout check.

Hope it helps.

1993 GMC Sierra... | Answered on Feb 18, 2019


You have to remove the two tubes and change 2 o'ring or seal.
Warning; before removing the bolt you need to release R-134a pressure.
Refill with 1onces of A/C oil compressor and fill with the specifications of R-134a.

Hope it helps.

1993 GMC Sierra... | Answered on Feb 18, 2019


Need to change valves steam seal.
There is a leak of engine oil during cool down of the engine. So when you start the cold engine it is burning oil that leak inside the combustion chamber.

Hope it helps.

1993 GMC Sierra... | Answered on Feb 18, 2019


your fuse panel is either under the dash by the drivers left knee or on the side of the dash where it meets the door. the radio fuse should be the second from the top right side of the fuse panel. its a 10 amp fuse. the power for the switch should be a 16 gauge wire run from the passenger firewall (under hood.) behind a plastic cover where a lot of wires are bolted to posts. that red wire feeds power to almost everything in the cab. it runs behind the glove box and has a disconnect there. if the fuse is not bad and the wire looks good, check the ground on the passenger door "open switch" (the one that is supposed to turn on the dome light. that is where the whole system is grounded for the int. lights lights

1993 GMC Sierra... | Answered on Jan 10, 2018


Does it shift rough due to the idle speed of the engine? If I had to make a guess, it sound like the distributor cap has water in it or has melted a bit. Check into that. Could be a bad spark plug or wire too.

1993 GMC Sierra... | Answered on Oct 30, 2017


Does it miss at idle or going down the road, maybe both? Any applicable trouble codes? If you have that spider fuel system, I usually suspect that first. That system is noted for problems.
You could try a cylinder balance test, engine idling, you could kill the cylinders one at a time, quickly. If you kill a cylinder that has no effect on the idle, the cylinder is dead. Then you have to decide if problem is spark--fuel--compression on that cylinder.

1993 GMC Sierra... | Answered on Oct 14, 2017


I'm assuming "white" smoke and not "black" since you didn't mention.
If white smoke, it's coolant or oil leaking into the cylinder heads while it is not running.
If oil and from leaking valve guide seals, it's not a serious thing and basically a nuisance. Just keep your motor oil level topped off until you have new seals installed or dispose of vehicle.
If coolant, it's a much more serious problem. The liquid in the head will do two things. One, foul the spark plug and possibly cause hydraulic lock (fluids cannot be compressed and cylinder locks up)
Check you oil level and if keeps going down a quart every few hundred miles, it's the valve seals.
Check your coolant. If down, it's possibly a head gasket leak, which is not uncommon for vintage and make.
If coolant keeps going down and not leaking on ground, that's a smoking gun, not to make a bad pun, for a leaking head gasket. At this point, it's prudent to first invest $10 on Barr's Leak Copper (looks like liquid copper in a jar) and add to your coolant system. Follow manufacturer's instructions and then see if problem either persists or abates.
If it abates, go and buy a lottery ticket since you're very lucky and solved a serious problem with an inexpensive fix.

Good Luck

1993 GMC Sierra... | Answered on Sep 22, 2017


The fuel level gage sending unit is defective, very common problem. The sending unit comes with a new fuel pump and is referred to as a module, also make darn sure you replace the fuel pump connector at the fuel tank, solder and shrink tube the new connector on, DO NOT USE CRIMP CONNECTORS.

1993 GMC Sierra... | Answered on Jun 30, 2017


it indicates injector problems
leaking injector seal /s dirty injectors
you can try moving no 4 injector to another cylinder and if the misfire moves as well , replace that injector
it it doesn't move the misfire , it is coils or ECM problems

1993 GMC Sierra... | Answered on Jun 07, 2017


I need to know , do you frequently run the fuel level to below 1/8 of a tank?
Has it been giving you any signs?
We need to know if there is fuel presure
Is there Spark at all 8
has it been in heavy driving through puddles

1993 GMC Sierra... | Answered on Nov 29, 2016


That is not a radio. That is a control head. The 7 wires carry data to the radio brain which on this trucks is a silver box located directly above the gas pedal. These trucks also had an optional cassette player/ cassette and eq unit that was mounted in the center of the dash that also connected to the radio brain as well.

1993 GMC Sierra... | Answered on Jul 17, 2016


I have 1993 gmc 4.3 vortec v6 turns over but want start. replaced fuel pump, fuel pump regulator ,ecm, tps, coil

1993 GMC Sierra... | Answered on Apr 23, 2016


Sounds as if the clutch is no good or is engaged constantly. Possible clutch worn out or throwout bearing is seized on input shaft

1993 GMC Sierra... | Answered on Mar 25, 2016


I'm going way back into my alcohol erased memory on this one, but check your oil level sender. I ran into this problem many years ago and it seems like that was the culprit.

1993 GMC Sierra... | Answered on Feb 22, 2016


sounds as if you need to be sure plugs are not fowling out and be sure fire from dist and coil is ok.

1993 GMC Sierra... | Answered on Jul 05, 2015


I would say that you have a fuel delivery issue, or contaminated fuel!
Change the fuel filter, check for proper pressure at the fuel rail, replace the pressure regulator and/or pump as necessary, and verify that debris is not clogging the fuel intake strainer.
If fuel system is operating properly, suspect contaminated fuel (especially if you have been using ethanol blend fuel). Change all fuel in vehicle, and likely your issue will be solved.

1993 GMC Sierra... | Answered on May 15, 2015


They don't adjust. They go in the tbi and seat to the bottom if they are leaking you need to change the o rings on them.

1993 GMC Sierra... | Answered on May 09, 2015

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