20 Most Recent 1994 GMC Sierra Questions & Answers


I would start with the ground by the fuel tank that leads to the fuel pump. Corrosion has been known to cuase erratic fuel issues on these trucks. Remove the ground lug (bolt) and scrapand wire brush the frame good ,the ring terminal at the end of the wire and the underside of the bolt. Check the wire end for rot (if it flexes too much) replace the ring terminal and put some silicone or heavy grease under it and attach securely to the frame. If that doesn't work you may need another pump I had to replace my replacement after 5 years (buy a mid range priced pump) not the least expensive from Am*zon or R*ck Auto.

1994 GMC Sierra | Answered on Jan 24, 2018


battery may have burnt out cell not enough cranking amps for the GMC

1994 GMC Sierra | Answered on Dec 03, 2017


get the codes scanned .sounds like the cat is plugging up

1994 GMC Sierra | Answered on Nov 18, 2017


it will short cycle while refrigerant is being added slows down when level starts to reach normal

1994 GMC Sierra | Answered on Nov 06, 2017


Hi First of all check the adjustment on the rear wheel thats sticking sometimes the brake pad comes away from the metal it is fixed to this maybe the case on your vehicle, the make & year of vehicle would help further but I a sure you got something to check now. Please leave me feedback, Malcolm Campbell.

1994 GMC Sierra | Answered on Sep 23, 2017


The lock cylinder is the most likely suspect and is in stock at your favorite local auto parts store. To change it, the steering wheel has to come off first. The lock cylinder is held in place by one screw. If there are more problems, you will see them when the steering wheel comes off.

1994 GMC Sierra | Answered on Sep 18, 2017


The filter is located on the inside of the drivers side frame rail around the area of the drivers door.

1994 GMC Sierra | Answered on Sep 18, 2017


Timing chain may have slipped a link.

1994 GMC Sierra | Answered on Sep 13, 2017


Let me get this clear.. you did not remove the cross member to drop the pan?? WHY?.. If you broke the bolt loose that is made into the transmission mount.. you need to be able to tighten the mount somehow.. if you can't tighten the mount, yes, you need to replace the mount . NEXT TIME - Use a jack stand under the front of the drive shaft to hold up the transmission.. this will make the job easier!!

1994 GMC Sierra | Answered on Jul 09, 2017


Have you changed your fuel filter?

1994 GMC Sierra | Answered on Jun 05, 2017


Check for a transmission speed sensor fault (OBDII scan). Loss of speed sensor signal will result in no torque converter lock up, and no overdrive. Also transmission filter should have been changed at 80,000 miles. Age of your vehicle(1994) warrants the filter service. Transfer case (4WD) needs to be serviced as well.

1994 GMC Sierra | Answered on Jun 04, 2017


Gage failures are very common on this truck, more than likely the gage stepper motor that drives the gage needle is defective.

1994 GMC Sierra | Answered on May 01, 2017


if accessible from a good angle Need to drill in to the broken part in the throttle body using a drill bit a bit smaller then the IAC thread as close as possible to the throttle body thread U need rethreading tap similar to the IAC valve if available in size and thread run thru to clean the throttle body thread and replace with new one if no access to it need take out throttle body U have to take Ur time.
Good Luck

1994 GMC Sierra | Answered on Dec 21, 2016


if there is an existing hole in what is left , try using a "easy out" tool of some sort, available from auto parts shop or quality tool stores
be careful and gentle as any removal tool will tend to expand what is left into the thread and make it harder to remove
if you have to drill a hole or enlarge a hole to get a tool involved . remove the throttle body from the engine so that metal swarf is not allowed to get into the engine

1994 GMC Sierra | Answered on Dec 21, 2016


Check very closely where the negative battery cable connects to the engine. Any looseness or corrosion there will prevent the full power of the battery to activate the starter. Check the negative battery cable itself to make sure it is in good condition and has no other connections than to the engine.

1994 GMC Sierra | Answered on Oct 25, 2016

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