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.

KOER code 66 & 98

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Old 02-28-2008, 05:14 PM
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littlebluelx
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Default KOER code 66 & 98

OK so the codes are 66 MAF low voltage
And 98 something to do with the computer or right bank lean/rich

I need to know what to do. The car smells rich and at start up it has a little Idle surge.

Anyone with info will help.

Thanks Will
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Old 02-29-2008, 11:01 AM
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littlebluelx
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Default RE: KOER code 66 & 98

It is stuballing and has a light surge inthe idle. It smells rich but is over heating like it is running lean. I unplugged the IAC and it died but I thought if you unpluged it and the idle got better it was the problem but mine just died. So there is some more info.

William
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Old 02-29-2008, 11:23 AM
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mjr46
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Default RE: KOER code 66 & 98

ORIGINAL: littlebluelx

It is stuballing and has a light surge inthe idle. It smells rich but is over heating like it is running lean. I unplugged the IAC and it died but I thought if you unpluged it and the idle got better it was the problem but mine just died. So there is some more info.

William
huh???^^^^^^^^^^^so which is it rich? overheating or running lean?? or all 3well 2 actually cause it can't run lean and rich at the same time........if it's overheating..fix that prob first!! is coolant low?? thermostat?? restricted radiator?? when does it over heat?? at idle?? driving down the road?? ...you've left to many need to know variables unanswered
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Old 02-29-2008, 11:23 AM
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AdderMk2
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Default RE: KOER code 66 & 98

find someone in your area with a MAF fox, or even a 94-95 mustang ANYTHING.... and swap the MAF into your car. I bet your sensor is DOA
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