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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 03-07-2014, 08:25 PM   #11
samltheriault
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alright i just tried cleaning it and its still doing the same thing (((
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Old 03-07-2014, 09:03 PM   #12
dawson1112
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You may need to test the maf . Check to make sure you don't have any air leaks after the maf also.

Here is a good reference for doing the test on the maf.
http://easyautodiagnostics.com/ford_...sor_ford_1.php
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Old 03-08-2014, 11:49 AM   #13
samltheriault
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Alright so i just did a KOER test and these are the codes i got

KOER test

12 - idle out of range. (high) - im assuming that this is because im not running a stock camshaft and the timing is more advanced then factory

21 - coolant temp sensor out of specified range or ECT out of range

41 - HEGO sensor voltage low/system lean. no HO2S switching detected - i believe that 41 is the right side. correct me if im wrong

30 - DTC not available - looked it up and it said something about cylinder 3 being out of balance?? don't know how its possible to detect that.

now the only thing i don't understand is that the KOEO test code 26 stats that the MAF is or transmission oil temp sensor is out of range. how could that be true if the cars (seems to run/rev fine) after a min or two of feathering the gas??? im thinking that maybe because of KOEO code 15 "power interruption to computer memory or EEC( PCM) keep alive memory (KAM)test failed 2. (EEC) (PCM) Read only memory (ROM) test failed." the computer isn't supporting enough memory to keep the MAF in spec. could this all be causes due to insufficient power circulation. which would go back to the way my single wire alternator wire is hooked up. (to the batt pos terminal in the back instead of the starter relay?) sorry bout the novel and i appreciate you hangin in here with me lol
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Old 03-08-2014, 11:50 AM   #14
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and i checked for air leaks and everything is good.
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Old 03-08-2014, 12:54 PM   #15
dawson1112
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Did you do the Koer with the engine at full operating temp?

The engine needs to be at operating tempreture to do this test . And the ecm needs to have gone into closed loop.

that coolant temp sensor out of range can mean that it thinks the car is much colder than it is or much hotter than it is . There will be no 02 switching until the car goes into closed loop, because it relies on the ECT to give information on engine temp to adjust the air/fuel mix. The engine must be at least 180 degrees Fahrenheit for the ect to pass the KOER.

http://www.oldfuelinjection.com/?p=28
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Old 03-08-2014, 01:03 PM   #16
mjr46
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try koer with engine at temp and if o2 code returns, swap to the other side and if code goes to that side = 02 dead = replace
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Old 03-08-2014, 01:47 PM   #17
samltheriault
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ill redo the test again i had it running for a good 10-15 minutes before i did the test and the temp at normal operating temp. but to make sure ill redo it. and ill def try switching over the o2 sensors as well. my ECT sensor was moved due to my HVAC delete. its in one of the coolant passages in the back of the lower intake manifold. i had to since the heater core lines were deleted as well but its still generally in the same spot just out in back of the engine. ill post a pic in a bit
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Old 03-08-2014, 02:09 PM   #18
samltheriault
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here are some pix of where the ECT sensor is
Attached Images
File Type: jpg IMG_0235.jpg (34.6 KB, 1 views)
File Type: jpg IMG_6520.jpg (39.9 KB, 1 views)
File Type: jpg IMG_7844.jpg (32.9 KB, 2 views)
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Old 03-08-2014, 02:40 PM   #19
samltheriault
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just swapped o2 sensors and still getting code 41
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Old 03-08-2014, 02:40 PM
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