ECU possibly dead?

A

Artyom

Member

Apr 11, 2024

32

0

8

USA

Aug 27, 2024

#1

• Aug 27, 2024

• #1

Hello, I’ve been dealing with a no start issue for a bit now. After chasing an issue with the fuel pump not priming, one day it randomly started to constantly prime when I had the EEC jumped using the test connector.
I would like to mention the fan would constantly run after I had replaced the EEC fuse and CCRM. Now the fan and fuel pump constantly run but still no start and barely any power to the injectors.
I’ve searched and read through loads of forums to diagnose the fuel pump not priming. Now with this new issue I’m finding that this is a common sign that a capacitor could be shot in the EEC? I took the cover off and can’t seem to find any blown caps and their legs are intact.
I’m really stumped on this issue, any help is much appreciated!

 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Admin Dude

Jan 4, 1985

42,890

21,072

234

Box behind Walmart

Aug 27, 2024

#2

• Aug 27, 2024

• #2

Send the EEC to a repair service. There's no way for us to tell if it's functioning through an image.

 

A

Artyom

Member

Apr 11, 2024

32

0

8

USA

Aug 27, 2024

#3

• Aug 27, 2024

• #3

Sent that image to help show that the caps are in tact and there weren’t any burn marks on the PCB.

 

AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

Oct 28, 2001

5,782

3,914

183

Claremore, OK

Aug 27, 2024

#4

• Aug 27, 2024

• #4

ECU Exchange

1987 to 1995 Ford Mustang 5.0 A9L A9P C3W A3M X3Z ECU Repair Service

1987 to 1995 Ford Mustang 5.0 A9L A9P C3W A3M X3Z ECU Engine Computer Repair Please fill out the R&R form here once you've placed your order.Easy repair process1. Purchase repair service (this way helps us keep track of what's coming in for repair)2. Include order number with your computer and...

www.theecuexchange.com

 

A

Artyom

Member

Apr 11, 2024

32

0

8

USA

Aug 27, 2024

#5

• Aug 27, 2024

• #5

So, after some diagnosing and moving some wires around she finally fires up after so long. But now the car has slightly low idle and bogs down when giving it barely any gas. Like it’s skipping a cylinder if that makes sense.
off to the next issue to fix! The vacuum lines the previous owners really **** up I’m guessing.

 

General karthief

wonder how much it would cost to ship you a pair

Mod Dude

Aug 25, 2016

27,827

10,508

203

polk county florida

Aug 27, 2024

#6

• Aug 27, 2024

• #6

Yeah, sounds like a large vacuum leak.
Did you buy it not running?
Also sounds like severely retarded timing.
Have you checked for codes?

 

A

Artyom

Member

Apr 11, 2024

32

0

8

USA

Aug 27, 2024

#7

• Aug 27, 2024

• #7

Yes it ran just fine after I fixed the EGR tube that was missing. But upon trying to replace the old leaking cork gasket on the valve cover, the car had me down a massive rabbit hole to get the thing to run again.
With it now running I’ve tried checking for codes but all I get is the usual 121. But my reader oddly says cylinder 8 before giving me the code 412 and 121 Again. (And also rich codes but those seem sometimes not show up)

 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Admin Dude

Jan 4, 1985

42,890

21,072

234

Box behind Walmart

Aug 27, 2024

#8

• Aug 27, 2024

• #8

The single digit "8" is identifying the total number of cylinders. Ignore it.

 

A

Artyom

Member

Apr 11, 2024

32

0

8

USA

Aug 27, 2024

#9

• Aug 27, 2024

• #9

Oooooh, I thought that was it telling you a specific cylinder has an issue. Why does it sometimes say 6…

 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Admin Dude

Jan 4, 1985

42,890

21,072

234

Box behind Walmart

Aug 27, 2024

#10

• Aug 27, 2024

• #10

Artyom said:

Oooooh, I thought that was it telling you a specific cylinder has an issue. Why does it sometimes say 6…

Click to expand...

Because EEC-IV is kinda dumb. LoL

 

Reactions: AeroCoupe