TBI power loss at one injector only

1998 GMC SUBURBAN
160,000 MILES • 7.4L • V8 • 4WD • AUTOMATIC
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PETER DRURY
  • MEMBER
  • 1 POST
Truck runs fine then drops a bank because one injector not spraying, then runs fine again for a while. Injector working okay because when I change plugs over that side starts to fuel okay. Have changed plug on top of injector with cable but no difference, suspect broken wire further in or been suggested pick up in distributor. Is there one pick up for each injector in the distributor?

Thanks
Dec 9, 2018 at 12:19 PM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Good afternoon,

I attached a wiring diagram for you of the injectors. It looks like you have a wiring issue that is cutting power to one side. Check the pink wire carefully for any damage on the affected side.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-a-car-fuse

No, these work of the signal from the crank sensor. If it was the crank sensor, both banks would die out, not just one.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Roy

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Mar 30, 2021 at 12:24 PM
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