Fox 1986 V6 Fuel/Electrical Issues, crank, no start, turns over with starting fluid

[JlChamberlain]

Hi folks,

Long time reader, first time caller.
I have a 1986 V6 convertible that all of a sudden gave me issues with fuel and starting.

Main symptom is: fuel pump does not kick on when switch is opened.

New fuel pump relay
New ECU
New fuel pump

Inertial switch in trunk is jumped
Fuel pump relay is jumped (now just pumps when switch is opened, doesn't turn off after 5 seconds as it should with working relay)
Fuel pressure is getting to the injectors (have depressurized Schrader by hand, and then run the fuel pump, and it reads as pressurized again)
It turns over once or twice with starting fluid

No obvious issues under the hood, fusible links look good, nothing clearly chewed through.

Reading through the excellent jrichker thread here: https://stangnet.com/mustang-forums...-checklist-for-fuel-injected-mustangs.787471/

I think I'm on to step 5, so perhaps it's a PIP sensor inside the distributor that is causing the injectors not to fire? Currently have a NOID light set on order from Amazon.

Could it be a clogged injector? From what I know it's not usually something that happens suddenly and causes a no start.

Would appreciate any advice y'all could send my way!

 

[Noobz347]

OBD Codes

 

[JlChamberlain]

OBD Codes

Thanks for the response!
I'm unable to get codes, either with the OBD INNOVA code reader, or with the hearing the multimeter continuity beeps from jumping the OBD I port to the battery.
I've also just checked all the fusible links I could find, on the ignition solenoid and otherwise, and they all checked out okay.

 

[Noobz347]

Thanks for the response!
I'm unable to get codes, either with the OBD INNOVA code reader, or with the hearing the multimeter continuity beeps from jumping the OBD I port to the battery.
I've also just checked all the fusible links I could find, on the ignition solenoid and otherwise, and they all checked out okay.

That's a pretty good indication that the EEC itself is bad.

You said earlier that you put in a "new" EEC? Post images of numbers on the EEC that is installed.

Home - ECU Exchange

ECU Exchange specializes in the re-manufacturing and repair of engine control modules.

www.theecuexchange.com

Do you still have the original EEC?
Have you plugged it in to see if your reader will connect?
Is the new one identical to the old one (numbers matching)?

 

[JlChamberlain]

That's a pretty good indication that the EEC itself is bad.

You said earlier that you put in a "new" EEC? Post images of numbers on the EEC that is installed.

Home - ECU Exchange

ECU Exchange specializes in the re-manufacturing and repair of engine control modules.

www.theecuexchange.com

Do you still have the original EEC?
Have you plugged it in to see if your reader will connect?
Is the new one identical to the old one (numbers matching)?

Thank you so much!
Good catch! Yes, I ordered a refurbished Cardone EEC from Rockauto.
Here is a link to photos:
View: https://imgur.com/a/UtMtTGZ

It appears the original has 6C15 in multiple spots, while the refurb has E4AB in the orange part by the connecting pins.
Having looked around, it appears that these EECs were shipped specifically for the year, make, model, and trim, and the refurb ones can cause issues? Would a good next step be trying to get the original repaired by the folks at your link?

 

[Noobz347]

Would a good next step be trying to get the original repaired by the folks at your link?

That would probably be my next stop.

 

[gkomo]

ECUExchange does great work so be at ease sending your ECU off to them.