20 Most Recent 1993 GMC Sierra K1500 - Page 9 Questions & Answers

check for power at starter and also check for power on ignition wire on starter selonoid while ignition is turned to start position. be cautious as it could engage. do you have power to trk radio,lights etc?? If not then check all batt cables connections to batt and grounds and to starter. also check fuses for a starter relay.

Have u checked the bearings? Shocks? Could also be the control arm bushings, sway bar bushings bad or broken link arms.

map sensor or gasket under throttle body spray ether around bottom gasket when running if it reves up the fix is cheap

Hate to break it to you, but the gauges on the older gmc's and chevys are just about junk. Your best bet would probably be to just get a set of aftermarket gauges from your local auto parts store and hook them up to replace your original ones,
hope this helps :)

basic tune up... plugs, wires, cap, rotor theres a start

If you have a hard brake pedal the most likely cause is the brake booster has gone bad, this can also cause your rough idle situation as well because of the vacuum issue that will be a problem because of the bad booster. there are 2 nuts that hold the master cylinder to the booster and 4 bolts on the booster under the dash, not a difficult job to replace you can leave the brake lines attached as well which will save time from bleeding the entire brake system. I hope this helps

Your converter won't be doing much after 17 years,
if it is the original

The exhaust gas readings are what you use to
diagnose the problem,you don't replace any parts
until you find the cause of the failed emission test.

What readings were high and by how much?

manufacturer decided they wanted a unique system of fuel injection, at least different then that of most systems. The control valve may act up and not allow fuel to inject at intervals. Instead, it may take be clogged with debri, gunk, and other trash which needs to be serviced in a shop to be repaired. One very common activity with your fuel injector is it may cause the valve to stay closed and burn gas in a manner that is inconsistent with normal gas usage, the vehicle will start to blow out black and dark smoke out the rear end, trick your cars oxygen sensor, and allow the system to burn a larger amount of fuel for the same mileage. This problem needs to be solved in a shop where the equipment is available to make adjustments and flush out your system.

There is a module on the frame near the back, passenger side.

4-5 liters (put in 4 then start checking).

i have a 93 gmc seirra 4x4 it did the same thing there is a big problem with the shifting silinoid that goes bad mine wouldnt shift in to second gear so i took it 2 my uncles garage and the first to second silinoid was bad so i would check that first b4 u took it 2 a tranny shop

some wire etc probly burned-do a good chec under hood for any abnormal connections and make sure fuses are correct # for each circuit--alternator shud be tested cause the voltage regulator may have failed sending a surge--a mobile scan of system is helpful

here ya go-

Hi,
Better check the brake switch, usually located under the steering column at the top of the brake pedal arm.
When you depress the brake pedal that switch will be activated, and when you let go it will be pressed by the brake arm.
Look for that switch, either it is disconnected or needs to be replace.
Hope that stops your problem!
Thanks for using Fixya!

if you know the firing order, then get #1 on TDC, and then take the cap off, the rotor should be pointing forward, thats where number 1 wire should go.

I'm not aware of this being a common issue Phil. Have you checked/replaced the fuse?

4l60 or 4l60e.

the most common cause is wheel speed sensor or sensor wiring not reading proper wheel speed.it is also possible the reluctor wheel inside front bearing is clogged with rust and debris and unable to send magnetic pulse. This can be tested with scanner to determine wheel in question.ohm meter can be used to test sensor and reluctor pulse.

your headlight bulb should come out from under the hood and you should have to turn a locking knock first

sounds like a connector tube came off. You can try with a flashlight to see from under dash. If not you would probably have to pull gauge assy out to get to it.