I have a 1991 5.7 k5 blazer having some problems if somebody might can help. It will start then run for a while then it wants to cut off like its losing power after it shuts off it will not start back up until it cools down. I have replaced the dist,rotor,spark plugs,wires,coil pack and fuel filter seems to be getting gas and spark but will not start. And i have checked the fuses the battery is a little week sometimes have to jump it off.

 

what about the coil in the cap?

 

My 77 K5 Blazer had the problem of not starting until it cooled down. Turned out it was the spring in the starter. It would expand when hot and not allow proper movement until it cooled down. It was replaced and works fine now.

 

Are you refering to the bendix, or solenoid? If the starter is hot, and the contact disk in the solenoid is "burnt", you will have issue with what appears a low battery on crank.

 

Well, not being very mechanically inclined, all I can remember is that the mechanic showed me a spring he had replaced and said it was from the starter. The mechanic was my wife's uncle, a good guy, with no reason to tell us something that wasn't true. He just wanted to help, had experience with Chevys and knew immediately when told about the symtoms.

 

Was it a fairly large spring?

 

Been a few years (about 1980) and that particular brain cell is only working part time. But, if I recall, the spring was maybe 1- 2 inches long by about 1/2 inch I.D.