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no cold idle up

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Old Nov 30, 2016 | 05:07 PM
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From: Parker, CO
no cold idle up
This is tough one to search on. Most of the results talk about a poor idle or the high idle mod.

I simply have no cold idle up. It used to work a few years ago but doesn't anymore. I live in Colorado and it's definitely cold enough for the high idle to kick in.

I have no codes, nothing bad shows up on the Auto Enginuity.

Any advice or things to try?

Thanks
 
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Old Nov 30, 2016 | 07:42 PM
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Truck reporting the correct temp to the PCM?
 
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Old Nov 30, 2016 | 08:42 PM
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I think so. I know I can read engine oil and coolant temp with the auto enginuity. Not sure if there is more than one temp sensor?
 
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Old Nov 30, 2016 | 08:55 PM
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I don't know what the PCM is watching to decide on idle rpm but it seems doubtful it's a software issue (just thinking out loud). It may watch IAT1 or IAT2 along with oil and coolant temps. Does it use the PTO idle box (what ever we call it ) that responds to the high idle wiring under the dash?
 
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Old Nov 30, 2016 | 08:57 PM
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Great questions. I'm clueless.
 
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Old Nov 30, 2016 | 09:00 PM
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Somebody here knows they just gotta come across this thread...
 
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Old Nov 30, 2016 | 09:18 PM
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Pretty sure that outside air temp is one of the parameters that comes into play.
 
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Old Nov 30, 2016 | 10:23 PM
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I believe your right Iat2 and Maff, looking at Ambient temps, Maff looks at air fuel timing so if both are in the blue it kicks the EGR closed to heat up the Intake gasses , PCM notices the heat transfer via Sensors and Walla high idle more fuel ratio until heat is achieved .
 
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Old Nov 30, 2016 | 10:28 PM
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Thus the reason to clean soot off the IAT2 but use only Maff cleaner on the Maff sensor.
 
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Old Dec 1, 2016 | 11:01 AM
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Thank you. I will check the Maf and IAT2. Where is the IAT2 located?
 
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Old Dec 1, 2016 | 03:41 PM
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From the Tech folder. (It is your friend)


 
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Old Dec 1, 2016 | 03:52 PM
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Thank you sir!

Originally Posted by Rusty Axlerod
From the Tech folder. (It is your friend)


 
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Old Dec 1, 2016 | 06:44 PM
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You need to cold soak this truck and Digitally check ALL Temp sensor upon cold KOEO And again KOER right after startup
 
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Old Dec 1, 2016 | 06:45 PM
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Scan for DTC


is it EGR Deleate
If so what about the valve
 
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Old Dec 1, 2016 | 06:53 PM
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High Idle pinpoint test
https://www.fleet.ford.com/truckbbas/non-html/Q108.pdf
 
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