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88' K5 Blazer 350TBI (Sometimes will not start)

Tiny
FMCGEE007
  • MEMBER
  • 1988 CHEVROLET TRAILBLAZER
I have an 88 K5 blazer with the 350 TBI engine. The guy I bought it from neglected to tell me that the wiring harness going to everything from the dash board back he had made. Well sometimes when I go to start the truck it will start perfectly, and other times the fuel pump will not click on and the truck wont start. I tested the wiring goin back to the pump and it is getting power even when it wont turn on. I was wondering if there may be a sensor or something triggering the ECM disconeccting power to the injectors or something along those lines. If anyone has any Idea please let me know.
Thanks
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Thursday, March 15th, 2007 AT 9:37 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The ECM activates the fuel pump relay than it goes to the pump-try checking the ground circuit and then comeback

Do you hear the pump for 2sec's when key is On?
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Thursday, March 15th, 2007 AT 5:13 PM
Tiny
FMCGEE007
  • MEMBER
  • 2 POSTS
When I do hear the pump going the truck will start. I will check the ground circuit and get back to you. Thank you
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Thursday, March 15th, 2007 AT 7:47 PM

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