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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 07-13-2010, 05:31 PM   #1
Bobert
3rd Gear Member
 
Join Date: Dec 2007
Vehicle: 1990 Lx
Location:
Posts: 717
Default KOEO Codes, car sputters, CEL flashes and causes rough driving. Help please!

Hello everyone. My car is currently embarrassing to drive. It sputters, and drives/decelerates extremely jerky.

I ran a KOEO with the actual machine decoder i borrowed from a friend, here are the random codes i got.

96 - Fuel Pump CKT

91 - Left EGO Lean

63 - TPS Low

41 - EGO Switch

31 - EVP/EPT Circuit

A few comments - This is the first time i have had a fuel issue. Both my O2's are brand new, in a BBK O/R H pipe. I have no idea what/where the EGO switch is. I have fixed my TPS before and i had it set up properly before the car started to run like crap. The Left bank being lean is a normal occurrence and i have yet to fix it. ( usually the right bank is reported lean too. ) Im pretty sure the EVP/EPT Circuit is the vacuum line 'containers' behind the passenger strut tower, but i have no clue whats wrong witt the circuit. There's no visible damage back there ( if im even looking at the right things )

Its a 1990 5.0L with a stock engine. Headers, BBK o/r H pipe, and a few suspension upgrades. Smog pump is still hooked up along with all the vacuum lines. The H pipe did have a hole for the smog pipe.

Any input is greatly appreciated!
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__________________
Materials Engineering Graduate from McMaster University -

1990 5.0L Lx, stock
There's no replacement for displacement.

"If you ask one more time about getting a larger maf... I will drive out to pennsylvania and push your car into a pond..." RIP AdderMK2

Last edited by Bobert; 07-13-2010 at 09:19 PM.
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Old 07-13-2010, 05:31 PM   #2
Bobert
3rd Gear Member
 
Join Date: Dec 2007
Vehicle: 1990 Lx
Location:
Posts: 717
Default

Oh also, the car has stalled out on me alot too. Which never happened before. This would be while the car is attempting to idle at a red light. ( Idle is extremely rough )
__________________
Materials Engineering Graduate from McMaster University -

1990 5.0L Lx, stock
There's no replacement for displacement.

"If you ask one more time about getting a larger maf... I will drive out to pennsylvania and push your car into a pond..." RIP AdderMK2
Bobert is offline   Reply With Quote
Old 07-13-2010, 05:31 PM
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1990, 1995, 50, 50liter, 90, 96, car, code, codes, fix, ford, gt, koeo, mustang, randomly, reading, sputtering

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