GMC G1500 - Popular Questions, Answers, Tips & Manuals

If you have spark but extra fuel, then you probably have a carburetor problem

John, Do you have any engine codes, these trucks with that engine were well known to have Distributor and cap problems(getting moisture in them) because of a vent in assy. plugging. If you have not replaced in a while, change cap and rotor, probably would not hurt to do plugs and wires too while your at it.

fuse under dash

A bad ignition switch likely.

ignition module in the distrb or a bad module

The dist. shaft may be loose or worn. Pull the dist. out and check for binding, sloppy movement, worn parts.

Check for play in distributor rotor shaft as they get worn out and need replacement. Remove distributor cap and hold the rotor from top and try to move it, ideally it should not move sideways.

You need to pull it apart and look for any damage to the connector. Wipe it clean and reconnect. If it still leaks, those connectors can be replaced. Check with the buick dealer.

the distributer has a bearing in the center of it if this has movment the rotor will spin and hit the sides take of dissy top and rotor and see if there is any exess movment if thats ok and its just burning out its probably tracking think this means it needs timing and the rotor and distributer cap need replacing would not of thought it would make the oil pressure come down but not sure on model as from uk hope this helps ivan

Sounds like the distributor shaft is worn out.

Hey man this should be a simple swap out. First take off your battery cables. Next unplug all the injectors that you are going to replace. Now there are a few way injectors are usually mounted. There should be some kind of bracket holding them in ether one large one for all injectors on each side of the engine or one for each individual. Once you have that off the injector should come out of the engine then just the reverse of the removal.

drivers side of engine is- 1-3-5-7, from radiator to firewall. -- 2-4-6-8 is on passengers side, firing order is 1-8-4-3-6-5-7-2, on the coil, drivers side from front to back is 1-7-3-5, on the passengers side from front to back, it is 8-2-4-6, If you go to Autozone.com and put in the information you are requesting.. It will bring up the info and pics.. Hope this helps.. I use it all the time. hope this helps, good-day!

the best way is to take out #1 spark plug. put a straw or similar on top of piston. turn engine by front damper pulley on nut. when the piston gets to the very top and just starts to go down, this is #1 position. but it can be off 180 degrees also. if piston is all the way up the rotor button should be pointing to #1 post in cap. then it should start, and just turn distributor to set the timing ( where engine runs best ). tighten down clamp on dist. then thats it! dont forget to put plug back in engine, good-day! if you turned engine both ways and it still is off, get the engine on #1 and pull dist. out and set it to #1. by hand.

Hello, I read your problem , and your description of the symptom. There is only two things this could be. Number one is your tire is badly out of alignment/ balance. Number two is the wheel barring. Both will cause these symptoms. However my money is on your wheel barring is bad. I am about 99 percent positive you have a wheel barring that has gone out. You can check this yourself by jacking up the back of truck, and pulling on the whole tire ( tugging toward you and away from you) if you have excess play, wheel barring is shot. Needs to be placed and packed. Another problem in addition if wheel barring is bad, because it has made your rear tire go all over and wobble, have it looked at to see if has worn uneven due to bad wheel bearing, otherwise even after replacing wheel barring, tire could wobble some, loose life span, or even blow out. I hope this helps. Mike

Okay...here we go....if you have the original 6 cyl motor (not sure what size motor you have though):

194 cu.in.--automatic---8 degrees BTC

230 cu.in.--standard---1 degree BTC

250 cu.in.--automatic---4 degrees BTC

292 cu.in.--standard--1 degree BTC

Please add more details please

i have a couple of suggestions it may be your radiator our your head gaskets our blown

LINE PRESSURE SHOULD BE 61 TO 180 PSI.

It's bolted to the bottom of the engine block at the rear. You need to take off the oil pan to see it.

REPLACE DOOR JAM SWITCHES