Starts Then Dies

Gmac1201 · Jun 22, 2018

I'm new to the forum and I need some help guys! I have a 91 mustang gt that won't stay running! It will turn over but immediately die. Tried unplugging the MAF sensor but still wouldn't stay running. What do I need to check? It has a bbk air intake by the way. Could it be the tps? I have no idea please help

General karthief · Jun 22, 2018

There is a surging idle checklist in the 5.0 technical/how to threads that will help you fix idle/stalling problems, go through the checklist step by step and it will save you time and money.

LASAR · Aug 16, 2018

General karthief said:
There is a surging idle checklist in the 5.0 technical/how to threads that will help you fix idle/stalling problems, go through the checklist step by step and it will save you time and money.

I'm challenged when trying to work on my son's '87 GT with its sensors and computer. . Trying to follow the surging idle checklist and have a problem.
I have 12 volts on the red wire on IAB. No reading between red and wht/lt blu wires. Also have 12 v from wht/lt blu wire and ground.
Think I might have a problem. Appreciate any help.

General karthief · Aug 16, 2018

Are you testing the wht/lt blu wire with the engine running?

LASAR · Aug 16, 2018

General karthief said:
Are you testing the wht/lt blu wire with the engine running?

key is on, engine off

Noobz347 · Aug 16, 2018

Tip #1: Meaningful Thread Titles

Let's see what suggestions pop up below if we use one.

I didn't like this feature at first but it grew on me. You find these down below.

jrichker · Aug 16, 2018

You have an open circuit between the IAB and the computer. Start by checking the resistance between the white/lt blue wire at the IAB connector and pin 6 of the black 10 Pin connector.

See the graphic for the 10 pin connector circuit layout.

LASAR · Aug 17, 2018

jrichker said:
You have an open circuit between the IAB and the computer. Start by checking the resistance between the white/lt blue wire at the IAB connector and pin 6 of the black 10 Pin connector.

See the graphic for the 10 pin connector circuit layout.

zero resistance between wht/blu and pin 6

jrichker · Aug 17, 2018

LASAR said:
zero resistance between wht/blu and pin 6

If your multimeter does not auto range, be sure that you manually set it to the lowest range or on continuity test.

Some meters read a open circuit or out of range high resistance as zero.
You should have seen approximately the same reading as when you short both probe tips together.

LASAR · Aug 18, 2018

Have multimeter on lowest setting (200) and shows .02 ohms.
Guess I need to check connector to ecu. Is that pin 21?

jrichker · Aug 18, 2018

LASAR said:
Have multimeter on lowest setting (200) and shows .02 ohms.
Guess I need to check connector to ecu. Is that pin 21?

That would be the logical next step...

LASAR · Sep 11, 2018

jrichker said:
That would be the logical next step...

Haven't been able to get to working on the Mustang until now.
Checked resistance between pin 6 and ecu and have .4 ohms.
What should I try next? Thanks

Starts Then Dies

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