1991 Chevrolet C1500 - Page 6 - Answered Questions & Fixed issues

If you are sure that your freon is not low..then stick with the low pressure switch circuit.
Check the wiring on your plug very thoroughly.. These have a problem on many vehicles..
Look at the prongs on the inside of your switch to make sure that neither pin has been bent or damaged. If all this checks out ok.. then plug it all in and shake or wiggle wiring to see if anything makes the system come on..

If all this fails to help you.. then I would unscrew the pressure switch and make sure that you are depressing the schraeder valve..(the valve stem looking guy that is in your accumulator).. There could be a problem with getting actual pressure to make the switch.. Good Luck.. Let me know how you come out..

I have seen this problem, if you have no oil pressure the engine would be rattling, the oil pressure sending unit could be bad, you can buy a oil pressure gauge to test and make sure oil pressure is ok, the sending unit may fix your problem.

Ignition module on distributor?

By skips, I assume you mean misses. If it's missing, changing the coil wont solve the problem. Are the spark plugs fresh? What is the condition of the ignition wires? How are the cap and rotor? If they're all good and the problem is getting worse, check the compression on all of the cylinders. You can get an idea of which cylinder(s) are missing by starting the engine cold and letting it run for 20-30 seconds, then feel the exhaust manifold(s) to see which cylinder(s) has a cold manifold that corresponds to it. Normally, if a valve or head gasket lets loose you will get a miss that can become progressively worse and you will get some backfiring associated with it.

Sounds like you have an injector leaking. Have someone just cycle the key on and off to run the fuel pump but don't crank the engine. If you see fuel dripping from the injectors, unbolt the injector cover on the throttle body, remove the injectors and replace the orings around the injectors.

there are a few differences in 96 there is a range indicator switch which also works as a neutral safety switch mounted on the selector shaft. if the 93 tranny is original it wont have the bosses to mount that switch.

Have the ignition coil or coils checked. That is one component that can become temperature sensitive. Most part stores have the ability to check ignition coils. Another possibility is clogged fuel injectors. If you think that is what it could be, then you can have them professionally cleaned with a fuel injection cleaning machine. I have seen this procedure work very well in certain cases. I hope this information has been helpful and thank you for using Fixya.com.

There is no wiring diagram for the charging system, unless you're talking about the regulator inside the alternator. The battery connects directly to the alternator, and that's the only wire involved. If the regulator fails, you have to replace the alternator.

ok,try and check the clutch pump probably need to be bleed it.or you most need the whole clutch set.

Thanks for choosing FixYa and welcome to the sight. There is no tailgate release on this vehicle. The lever on the back is the only one. Sorry.

i would first check my timing making sure its at 0' tdc with the emc bypass wire unpluged then check for vacume leaks

This problem is caused by a defective fuel level sending unit inside the fuel tank. To replace the defective fuel level sender you must remove the fuel tank from the truck.

run a wire direct from battery to the small terminal on the starter motor solonoid ,if it still doesnt work or click then its either the earth cable from engine to the chassis or the starter motor .

It could mean a lot of things, but first thing I would check is your battery and alternator. If one or both of those are bad that could definitely cause this.
Thanks,
Lee

Are you asking about the drum for the drum breaks. The breaks are in the drum

If you have already gotten all the air out of the system, you may have to remove the clutch assembly and check the finger height compared with the one you removed as some designs are lower or higher than the original. You can either try to find one that matches the old one or change the throwout bearing (they come in several heights)...In your case I'd use a longer one.
The transmission has nothing to do with clutch release height and the only part it plays in clutch operation is that the neck on the front cover acts as a guide to stabilize the throwout bearing. (always make sure there is a light coating of grease on it so the bearing does not seize on there when in use.)

The no spark issue is most likely the ignition control module, but could be the cap/rotor or coil.

Hope this helps.

You need to have the oil pressure checked with a manual oil pressure gauge you may have a bad sending unit. If the you oil pressure is the same with the manual gauge then you have a oil pressure problem.

i had the same problem on my 90 half ton, it is more than likley the starter has stuck in the engaged position. There are contacts inside of the solenoid that can in effect weld themselves together. Try giving the starter a tap with a hammer, (don't go crazy but give it a good whack) if you cant reach use a piece of pipe or something to get down to the starter. Hit on the body of the starter,(the big part) not the solenoid. Then hook the battery back up and see what happens. If it starts with the key like normal, change the starter. If it still turns over when you hook the battery up get under the truck (after you disconnect the battery) and disconnect the battery cable (large red wire) from the starter to the battery and tie it away from any metal. Hook the battery back up and get back under and find the small wire on the starter. With the key off use a test light or meter to check for voltage on the small wire. If there is power there with the key off it could be the ignition switch. If there is no power, change the starter. Keep in mind that if the starter is as old as the truck it may break when you try to get the battery cable off of it, but if it does thats another sign that the starter/solenoid is the cause of your problems. If you don't feel comfortable testing anything just take the starter off and take it somewhere, lots of places will test it for free.