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Electrical 93 5.0 No Injector Pulse

  • Thread starter Thread starter machinermac
  • Start date Start date Yesterday at 12:32 PM
  • Tags Tags
    electrical issue fuel delivery
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machinermac

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Jul 26, 2026
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Yesterday at 12:32 PM
#1
  • Yesterday at 12:32 PM
  • #1
Just picked up a 93 5.0 because the seller was not a car guy and just wanted to drive it. I have run down as far as I understand the fuel system pulled the intake and checked fro 12v at each injector all good did continuity test from each injector ground back to the ecu plug all test good. None of the injector wires will flash a noid light. If I have the intake on and shoot starting fluid at it it does run (not perfectly) so I do have spark and timing seems right.

The next previous owner did some mods like a cam and suspension/frame stabilizers but the ECU and fuel look mostly stock. Looking for some direction on where to look to next before I start talking about a new ECU or just installing a standalone.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
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Yesterday at 12:42 PM
#2
  • Yesterday at 12:42 PM
  • #2
Pull codes:

OBD1 readers are cheap on Amazon or you could pull codes with a paperclip if you are so inclined.

Electrical Thread 'How To Pull Codes From EEC-IV In 86- 95 5.0 Mustangs'

Jan 27, 2016
@Noobz347 - The code dump procedure isn't in the sticky - you may want to add it...



Dump the codes: Codes may be present even if the Check Engine Light (CEL) isn't on.

Dumping the computer diagnostic codes on 86-95 Mustangs

Revised 26-July-2011. Added need to make sure the clutch is pressed when dumping codes.

Codes may be present even if the check engine light hasn’t come on, so be sure to check for them.

Here's the way to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for...
  • jrichker
  • Replies: 10
  • Forum: Fox 5.0 Mustang Tech
 
Reactions: Mcmahst
M

machinermac

New Member
Jul 26, 2026
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Yesterday at 2:19 PM
#3
  • Yesterday at 2:19 PM
  • #3
Noobz347 said:
Pull codes:

OBD1 readers are cheap on Amazon or you could pull codes with a paperclip if you are so inclined.

Electrical Thread 'How To Pull Codes From EEC-IV In 86- 95 5.0 Mustangs'

Jan 27, 2016
@Noobz347 - The code dump procedure isn't in the sticky - you may want to add it...



Dump the codes: Codes may be present even if the Check Engine Light (CEL) isn't on.

Dumping the computer diagnostic codes on 86-95 Mustangs

Revised 26-July-2011. Added need to make sure the clutch is pressed when dumping codes.

Codes may be present even if the check engine light hasn’t come on, so be sure to check for them.

Here's the way to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for...
  • jrichker
  • Replies: 10
  • Forum: Fox 5.0 Mustang Tech
Click to expand...
As of yet I cannot find a STI or loose cable that should be in that connector anywhere near the self test connector. There is a similar connector near the starter solenoid but its just black wires. I do have a reader but I dont want to fry a possibly good ecu connecting the wrong thing.
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
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Yesterday at 3:48 PM
#4
  • Yesterday at 3:48 PM
  • #4
My guess is the PIP but need to pull codes first.
 
Reactions: Mcmahst
M

machinermac

New Member
Jul 26, 2026
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0
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Minnesota
Yesterday at 7:12 PM
#5
  • Yesterday at 7:12 PM
  • #5
Was able to trace the line back from the ECU plug it got moved into the STO but when jumpered I get no codes not even 11. Got to do some more testing but if I can't get codes out of it the former owner was screwing with the ECU and it might be shot.
 

JD1964

there is enough sticking out to grab on to
15 Year Member
Jun 28, 2013
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Today at 6:25 AM
#6
  • Today at 6:25 AM
  • #6
Can you hear the fuel pump prime when you turn the key to the run position? The pump should run for a couple seconds and then automatically stop.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
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Today at 7:49 AM
#7
  • Today at 7:49 AM
  • #7
TPS issues can also cause this. Essentially if the TPS returns full 5V sensor ref the ECU will not fire the injectors.

But, sounds like you might have some ECU issues. I second the "do you hear the pump prime" when you cycle the key question
 
Reactions: General karthief
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