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Help with KOEO and KOER codes

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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.

Help with KOEO and KOER codes

Old 09-03-2007, 03:32 PM
  #1  
95w.i.p
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Default Help with KOEO and KOER codes

KOEO
122-TPS signal voltage is too low
124-TPS signal voltage is higher than expected
157-MAF signal voltage is too low
332-Insufficient EGR flow detected
334-EGR Valve Position sensor signal voltage higher than expected (closed valve position)
KOER
334 again
I am having problems with surging, and irregular idle. Could all of these things be the culpret or could it be something else. The TPS problems don't really make sense to me, too high, too low, and the same for the EGR.
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Old 09-03-2007, 04:44 PM
  #2  
86GreenMachine
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Default RE: Help with KOEO and KOER codes

Try and set your TPS betwwen .5 to .98. To do so loosen the screws and turn it and watch the voltage reading. As long as its in between that voltage range the comp will take care of therest.If u cant get the voltage between .5-.98 then your TPS is most likely fubared.Have u tried a base idle reset?
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Old 09-03-2007, 05:39 PM
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95w.i.p
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Default RE: Help with KOEO and KOER codes

According to the manual I can't adjust the TPS on a 95'. No I haven't tried a base idle reset. I am not really sure how.
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Old 09-03-2007, 05:46 PM
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slickshift
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Default RE: Help with KOEO and KOER codes

ORIGINAL: 95w.i.p

According to the manual I can't adjust the TPS on a 95'.
That's correct
In as much as the computer resets it if you do
So the infamous "ricer mod" of setting your TPS higher doesn't "work"

BUT, you want to check it
If it's not in specs, and you can't wiggle it into specs, or the voltage jumps all over the place, it's probably toast
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Old 09-03-2007, 05:50 PM
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95w.i.p
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Default RE: Help with KOEO and KOER codes

So is the TSP the culpret of the rest of the problems or is it just one of the problems that I need to replace
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Old 09-03-2007, 06:01 PM
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Joel5.0
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Default RE: Help with KOEO and KOER codes

Need to start from scratch.....clear the codes, make sure memory is clear (run KOEO to verify), verify TPS output with a voltmeter, test drive it for 10 minutes, and rerun a KOEO and a KOER self-test. Those codes may have been logged in memory if you disconnected any of the sensors while the engine was running (= false codes).
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Old 09-03-2007, 06:05 PM
  #7  
95w.i.p
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Default RE: Help with KOEO and KOER codes

The only codes that were in the memory was 334,
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Old 09-03-2007, 06:32 PM
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Joel5.0
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Default RE: Help with KOEO and KOER codes

ORIGINAL: 95w.i.p

The only codes that were in the memory was 334,
The fact that you could run a KOER means that there wasn't a "hard failure code" present......otherwise, the KOER reading would have been:
998 = Hard fault present + the code that's causing the failure (122, 124 and 157 are "hard fault codes")......need to check if it's an intermittent failure.
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Old 09-03-2007, 06:49 PM
  #9  
95w.i.p
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Default RE: Help with KOEO and KOER codes

What is an intermittent failure?
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Old 09-03-2007, 07:43 PM
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Joel5.0
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Default RE: Help with KOEO and KOER codes

ORIGINAL: 95w.i.p

What is an intermittent failure?
One that is not present all the time.......if you check the TPS for example, from closed throttle-WOT-closed throttle, and is intermittently failing, you would see something like.......



....but not every time.
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