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Progress Thread 12th Owner: My '93 Notchback Restoration & Performance Build

  • Thread starter Thread starter Habu135
  • Start date Start date Jul 7, 2019
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Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
17,945
224
Massachusetts
Dec 16, 2020
#601
  • Dec 16, 2020
  • #601
I don’t think fuel pump is it, especially if it’s holding pressure under load.
 

Habu135

5 Year Member
Jan 10, 2019
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Dec 16, 2020
#602
  • Dec 16, 2020
  • #602
Mustang5L5 said:
I don’t think fuel pump is it, especially if it’s holding pressure under load.
Click to expand...
It's probably at least 8 years old.

Fuel pressure increases as I accelerate.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
17,945
224
Massachusetts
Dec 16, 2020
#603
  • Dec 16, 2020
  • #603
Habu135 said:
It's probably at least 8 years old.

Fuel pressure increases as I accelerate.
Click to expand...

as it should. Should be 35 psi or so at idle and 39-42psi when you give it the beans
 

90sickfox

Wasn't a pretty sight...and I've got big hands
SN Certified Technician
Mar 2, 2015
6,945
5,816
213
Dec 16, 2020
#604
  • Dec 16, 2020
  • #604
It could be something weird with the computer itself. People here have had good results with ECUexchange on ebay. They only deal there and you have to send your computer to them and they replace the caps and wear items and fix whatever else they see. These computers were never expected to live 30+ years. I dealt with a different ecu exchange company but have since lost all the info. It really isn't expensive....and after that you can clear the computer having an issue from the back of your mind.
 

Habu135

5 Year Member
Jan 10, 2019
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Dec 16, 2020
#605
  • Dec 16, 2020
  • #605
Ran codes again. Got the same ghost codes as before (85 and 87), but with a new one #95 -Fuel Pump Secondary Circuit Fault.

Also did the Cylinder Balance Test. Received a 90 -System is OK, all cylinders are contributing equally.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
17,945
224
Massachusetts
Dec 16, 2020
#606
  • Dec 16, 2020
  • #606
Hmm to 95. Intermittent power loss to the pump? That’s usually the only thing that triggers that code
 

Habu135

5 Year Member
Jan 10, 2019
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Dec 16, 2020
#607
  • Dec 16, 2020
  • #607
Mustang5L5 said:
Hmm to 95. Intermittent power loss to the pump? That’s usually the only thing that triggers that code
Click to expand...
Ya, so is that a fuel pump going bad or a lack of power intermittently?
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,944
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polk county florida
Dec 16, 2020
#608
  • Dec 16, 2020
  • #608
Intermittent power loss
Do you notice anything odd with the gauges when it acts up.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
17,945
224
Massachusetts
Dec 16, 2020
#609
  • Dec 16, 2020
  • #609
The latter. The wire to the ECU only monitors the fuel pump relay. I’d clear the codes. Go for. Rip, duplicate the problem, and then see if code 95 is back.
 

Habu135

5 Year Member
Jan 10, 2019
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Dec 16, 2020
#610
  • Dec 16, 2020
  • #610
General karthief said:
Intermittent power loss
Do you notice anything odd with the gauges when it acts up.
Click to expand...
Nothing. I'll clear codes and do another KOEO test.
 
Reactions: General karthief

stanglx2002

CT Material here
15 Year Member
Jul 7, 2005
1,563
1,110
164
Dec 16, 2020
#611
  • Dec 16, 2020
  • #611
Has the ignition switch been replaced? This causes slot of these similar issues and is cheap to replace as they go bad over time as well.
 

Habu135

5 Year Member
Jan 10, 2019
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Dec 16, 2020
#612
  • Dec 16, 2020
  • #612
stanglx2002 said:
Has the ignition switch been replaced? This causes slot of these similar issues and is cheap to replace as they go bad over time as well.
Click to expand...
I don't think the ignition has been replaced. The key looks pretty worn.
 

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Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
17,945
224
Massachusetts
Dec 16, 2020
#613
  • Dec 16, 2020
  • #613
Not the actual ignotion, but this switch under

 

Habu135

5 Year Member
Jan 10, 2019
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Dec 17, 2020
#614
  • Dec 17, 2020
  • #614
Came across this old post while doing more research:

Good to know about a NO START condition!​


If you've checked everything else and you have:
Good Spark & Good Fuel Pressure at the rail,
and decided that your injectors are not pulsing,
(another symptom will be, the fuel pump runs continualy with key on, & MIL stays on when trying to self test);
Then check the 10uf electrolytic capacitor inside the EEC!
The negative lead sometimes fries and it will also take out the trace on the circuit board, which you will also have to repair!

I will say that my fuel pump does remain on consistently.
 

Habu135

5 Year Member
Jan 10, 2019
1,223
781
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California
Dec 17, 2020
#615
  • Dec 17, 2020
  • #615
Mustang5L5 said:
Not the actual ignotion, but this switch under

Click to expand...
My car starts fine although when it's driven hard and the car is hot it does struggle to start occasionally and requires a little gas pedal messaging.
 

Habu135

5 Year Member
Jan 10, 2019
1,223
781
133
California
Dec 17, 2020
#616
  • Dec 17, 2020
  • #616
Cleared the "Continuous Memory" codes and did another Key On Engine Off check. Came up with 95 again (Fuel Pump Secondary Circuit Fault). This car is a former 4 cylinder and either the pump was wired to always be on or the EEC is dying, but most likely the former. Unknown if the fuel pump is original, but since 30 pound injectors were installed as well as a number of other goodies I would think the pump was upgraded.

I'm leaning toward swapping out the pump with a 155 or 190 LPH Walbro. Is there any point in swapping out the fuel pump relay underneath the MAF meter? That would be cheaper and easier, but I'm not sure if that's relevant.

I can generally trigger the car to act up if I hot rod it a bit. It will get hot and then begin to stutter while cruising.
 

HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
723
272
73
Memphis TN
Dec 17, 2020
#617
  • Dec 17, 2020
  • #617
If you have a high speed miss, the TFI may very well be at fault....they have a failure mode where they work but miss @ high RPM above 3500
 

Habu135

5 Year Member
Jan 10, 2019
1,223
781
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California
Dec 17, 2020
#618
  • Dec 17, 2020
  • #618
HemiRick said:
If you have a high speed miss, the TFI may very well be at fault....they have a failure mode where they work but miss @ high RPM above 3500
Click to expand...
It's at all rpms. The only thing that is consistent is that the engine gets hot and then acts up.
 

Habu135

5 Year Member
Jan 10, 2019
1,223
781
133
California
Dec 17, 2020
#619
  • Dec 17, 2020
  • #619
I'll treat my car to a Standard Motor Products RY214 relay and see if that does the trick. If not I'll be looking to a Walbro 190 LPH pump.
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,944
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polk county florida
Dec 17, 2020
#620
  • Dec 17, 2020
  • #620
What do you mean by hot? Like over heating or just warmer than regular cruise temp.
 
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