1986 Ford F-150 injector not firing

WILLIAMBEAM

MEMBER
1986 FORD F-150
V8
2WD
AUTOMATIC
180,000 MILES

I've got power to my injectors but no pulse signal. I read that my tps should read.08 volts with key on engine off, and mine reads somewhere around 7.45volts. Could that be my problem with my injectors? What controls my pulse signal to the injectors?

4 Replies

WILLIAMBEAM

MEMBER
2 POSTS

Where exactly is the ground for the computer located, where does it run, directly from the battery neg terminal to where?

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Monday, August 24th, 2009 AT 7:36 PM

MJR346

MECHANIC
132 POSTS

Are you reading your TPS correctly? If so, look for a shorted TPS causing your concern (known problem)

But one wire should be 5v, other should be around 0.8 volts and one should be ground.

Pulse comes from distributor and pip signal from ignition module

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Monday, August 24th, 2009 AT 9:02 PM

WILLIAMBEAM

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2 POSTS

I'll have to double check myself on the tps readings. Could you tell me which color are the wires I'm looking for? But I just replaced the ICM and I still have no pulse signal.

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Tuesday, August 25th, 2009 AT 9:21 AM

MJR346

MECHANIC
132 POSTS

I beleive the following are true

A=BLK (ground)
B=GRN (signal)
C=ORG ( 5V ref)

This I saw on another site, as I don't have access to repair manuals that old anymore :-(

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Tuesday, August 25th, 2009 AT 7:10 PM