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Re: 1991 gmc sierra wont start
There are so many things that could have caused this problem to occur. Here are some of my suggestions:
1. Blockage in the air supply to mix with the fuel. Throttle body might need cleaning
2. Compression in the cylinders might be low, probably due to large ring gaps. If you can get your hands on a compression tester to check the compression values of each cylinder, so as to ensure they are in operable range. By the way, was the vehicle smoking heavily when in operation?
3. Is your battery giving a good turn over of the engine? A weak battery can cause an engine not to start. The engine would turn over but just won't start. (Is the engine turning over when you try starting, or does the engine not responding when turning the key?)
4. Igniter in the distributor might need electrical checks to ensure proper electrical circuitry. Liaise with an auto-electrican about this.
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Do you have a little screw driver? there is a fuel pressure test port take the cap out now be carefull when you do this crank it and at the same time press the shrader does gas come out like alotnot just a little but alot if it does then the fuel pump works now if it dribbles then your fuel pump failed,Okay if the fuel pump works the only thing that is left is the coil and ignition control module, before you decide to do the module or the coil the number on reason for it not to start is connection to the coil I see this all the time go to the coil connection and have some one crank it while you wiggle it and see if it start then.now if it still doesnt start youll just have to test for spark and if there is no spark your best solution is to replace the whole distributor why because there is a relector that has always failed even when it gives spark. and fuel because as a timed unit it gave fuel and spark at the wrong time here use the picture included in #1 wiggle connection #2 check for spark
COULD BE BAD IGNITION COIL OR MODULE.IT COULD BE BAD FUEL INJECTOR OR INJECTORS.CLOGGED FUEL FILTER. A BAD DISTRIBUTOR CAP ROTOR + BAD PLUGS AND WIRES WILL CAUSE PROBLEMS AND BAD FUEL WITH WATER IN IT.
When this truck dies,does it have spark,or fuel pressure?Check it for no spark,if it has no spark,replace the ignition module.These gm year models are bad to go out ,and the distributor pick up coil also.Replace the module first,if this does not help,replace the pick up coil.NOW ON A FUEL RELATED PROBLEMit could be fuel pump,fuel pump relay,or the pick up coil.The pick up coil pulses the injectors,and the spark.I hope this helps,if not let me know.