No power to throttle body injectors.

Tiny
AARONVB
  • MEMBER
  • 1990 ISUZU TROOPER
  • 180,000 MILES
The trooper stalled and fired right back up. Run die, run die. It did this all the way home, 5 miles. It acted like a total loss of power or fuel. It did idle fine after getting it home.
I held the accelerator peddle at 2000, it ran - stalled all the way to dead. I replaced the fuel pump, fuel filter, throttle positioning switch, rebuilt the throttle body replacing the accelerator pump in it. Cap, rotor, wires and plugs. Codes are 22 (fuel cut solenoid circuit) and 34 (egr temp. Sensor circuit), neither of which I can find in the haynes Manual. Fuel pump works, fuel at throttle body.
Where does the power for the injectors come from? Should there be power at the injector, key on and cranking?
Wednesday, October 5th, 2011 AT 8:49 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A fuel injected engine does not have an accelerator pump-verify if its a fuel injected or carb fuel system
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Wednesday, October 5th, 2011 AT 8:59 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
The power to the injector comes from the computer.
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Wednesday, October 5th, 2011 AT 8:59 PM
Tiny
AARONVB
  • MEMBER
  • 3 POSTS
It is TBI and I replaced the pressure regulator in it, sorry for the mis information. I replaced the upper motor wiring harness yesterday to repair the melted wires. Nothing yet. The computer ECM is today.
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Thursday, October 6th, 2011 AT 1:11 PM
Tiny
AARONVB
  • MEMBER
  • 3 POSTS
It is TBI and I replaced the pressure regulator, sorry for the mis information. I replaced the upper motor wiring harness yesterday. Today the ECM will be replaced.
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Thursday, October 6th, 2011 AT 1:14 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Let us know what you find.
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Thursday, October 6th, 2011 AT 1:19 PM

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