6637 mod, Now service engine light on? - Ford Powerstroke Diesel Forum
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Old 11-29-2013, 04:27 PM
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6637 mod, Now service engine light on?

Did the 6637 to my 01 today, now the "service engine soon" light is on. Is this common? I can get it scanned at the local parts store, just figured I'd check to see if this is a common issue after the 6637 mod that I can easily fix. Thanks in advance.
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Old 11-29-2013, 04:34 PM
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did you disconnect the intake air temp sensor
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Old 11-29-2013, 07:04 PM
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I did. But I plugged it back in. I was suspicious of whether or not that was the culprit or not. Would it throw the code if it had been unplugged and then plugged back in? Should I just disconnect the batteries and see if it resets?
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Old 11-30-2013, 03:25 PM
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leave it disconnected and tucked into the wheel well.
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Old 11-30-2013, 03:37 PM
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I left mine connected and zip tied it to the filter.
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Old 11-30-2013, 04:08 PM
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I left mine connected, but I relocated to the bumper and now I use it as an ambient air temperature sensor since my truck is an XLT and doesn't have it.

But no you shouldn't get an engine light. Go back in there and see if you accidentally disconnected anything.
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Old 11-30-2013, 05:40 PM
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I was going to disconnect the batteries today to see if it would reset...but before I got to it the light went out. Kinda weird. I did run it one time without the air temp sensor plugged in. The first time driving with the 6637 (and air temp sensor unplugged) was when the light came on. I plugged the temp sensor back in and the light stayed on for a while but then on my last trip to the store I noticed it had gone out. So Im assuming it was related to the temp sensor being unplugged...?
So can I not run with the temp sensor unplugged without the service engine light being on?
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Old 12-01-2013, 03:29 PM
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Mines plugged in still and havnt gotten any lights on either sounds like there a ghost in your wiring. All the IAS does is just adjust the amount of fuel the computer adds. The colder the air the more fuel it adds, the warmer the air the less fuel it adds.
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Old 12-01-2013, 04:47 PM
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Quote:
Originally Posted by Im_Strokin_ur_Cummins View Post
Mines plugged in still and havnt gotten any lights on either sounds like there a ghost in your wiring. All the IAS does is just adjust the amount of fuel the computer adds. The colder the air the more fuel it adds, the warmer the air the less fuel it adds.
I don't think that is true.
My understanding is that the IAT sensor is used only to control the EBPV. If that's not the case I would like to know.
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Old 12-01-2013, 04:56 PM
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The PCM uses the air temperature information to operate the Exhaust Back-Pressure (EBP) system and to determine the cold idle setpoint.
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