Fuel 1990 mustang gt 5.0 no ground signal to fire injectors

[brandyn200]

I have a 1990 mustang gt 5.0 with a 5 speed I have recently been trying to fix it up and make it more reliable to drive.
I've been driving it all summer had 1 breakdown due to the ignition coil going bad but otherwise no issues. Then one morning I go out to start the car and it just cranks not even trying to fire up. I have narrowed it down to injector ground signal.

The car has a chip in the ECC and an aftermarket ignition coil and that is all the modification that I know of.

I had to put a new ECC in the car last summer because it had failed I have a feeling it is failed again. I have checked power at injectors and went through the checklist

Is it possible that the chip is frying the ECC?

Thanks in advance

 

[Noobz347]

If you have no mods, why do you have a "chip"?


Have you pulled codes? The EEC should tell on itself if it is smoked.

 

[brandyn200]

The chip was on the old eec thought it was necessary the car is kind of a mess someone went through and labeled all the wiring the car is rebadged as a cobra so I have no idea if there is any further mods. I got the car from a guy a few years ago and he basically just said come and get it so I have no idea how stock it is.

I noticed now that the fuel pump is priming for longer than normal sometimes

When trying to pull codes I get nothing.
When I plug my scanner in and start pulling codes the fuel pump doesn't even cycle on and off.

 

[General karthief]

Hard to find a fox body that ain't been molested just about to death from flippers and hacks
I would start by sending the computer off to get 'tuned up' (repaired) then before you plug it back in go through and make sure the computer grounds are all in tact, and the 02s are jumped correctly. Leave the chip out.
We prolly need to verify injectors size and MAF and id any other stuff that's been done.

 

[brandyn200]

Alright I will send the it back out car always gets parked for winter anyways

What else would make the eec go bad there has to be something if it's not the chip. Is there tests for wiring I could do in the meantime while waiting on the eec to be rebuilt?

 

[AeroCoupe]

ECU is kaput. Do you have an EVTM and wiring diagrams for the car?

https://www.forelpublishing.com/demo/Demo13900.pdf

Pardon Our Interruption...

 

[Noobz347]

What color are your injectors?

If they look like this:

Pull the chip and try to start the car.