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TBI power loss at one injector only

Tiny
PETER DRURY
  • MEMBER
  • 1998 GMC SUBURBAN
  • 7.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
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
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Sunday, December 9th, 2018 AT 12:19 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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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Tuesday, March 30th, 2021 AT 12:24 PM

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