Check engine light on uphill

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Jun 8, 2023 | 08:13 PM

raydav

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Mountain Pass

Joined: Feb 2005

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From: APPLE VALLEY

Check engine light on uphill

Can anyone point me to the algorithm that activates the check engine light. I have only a correlation. If I work it hard going up a hill, the light comes on. When I coast down the other side, the light goes off. Engine and trans temp does not change. I never leaves an error message.

Jun 8, 2023 | 08:20 PM

Walleye Hunter

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Joined: Mar 2014

Posts: 10,750

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From: Douglassville, PA

If it's chipped, something does that. Might be overboost on the manifold pressure. If it's not chipped, then something else is going on.

Jun 8, 2023 | 08:50 PM

raydav

Thread Starter

Mountain Pass

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From: APPLE VALLEY

Quote:

Originally Posted by Walleye Hunter

If it's chipped, something does that. Might be overboost on the manifold pressure. If it's not chipped, then something else is going on.

Not "chipped"

MAP as high as 29. Light does not immediately go on or off with MAP change.

Somewhere there is a bit of code that controls this. Where/what is it?

Jun 8, 2023 | 09:06 PM

97-psd

Logistics Pro

Joined: Mar 2007

Posts: 4,598

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From: knoxville, tn

Can you read live data from the truck? If it is under load while it happens, it could a high pressure oil issue that pops the code.

Jun 8, 2023 | 09:33 PM

cleatus12r

Butt-Head

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From: Reed Point, MT

It's probably either overboost or low injection pressure....but we're all just throwing stones in a pool without a code.

Read the code.

Jun 9, 2023 | 02:32 AM

carl2591

Fleet Mechanic

Joined: Nov 2005

Posts: 1,508

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From: North Carolina, Raleigh

I get that as well when pulling hard up hill with tuner in 60 HP tow tune.. have check codes during and after and no code at least on torque app i can find. have a boost fooler on but it still does it..

have checked HP oil pressure and its steady the whole time.. now i just down shift and let her rip.. 2-2200 is the sweet spot.. pulls like a freight train.. loving it here on alaskan highway,, but not liking all the frost heaves west of destruction bay.. OOOMMMGG.. some are like foot and half high.. WOW.. heading to Tok and Delta junction to get my certificate for surviving the alcan..

PS its midnight and still LIGHT out..

Jun 9, 2023 | 07:09 AM

Sous

FTE Leadership Emeritus

Joined: May 2014

Posts: 27,359

Likes: 5,957

From: Lake Hartwell, GA

Quote:

Originally Posted by carl2591

TorquePro app is terrible at everything except looking pretty, when it works that is. Get FORScan Lite for $5 or PC version for free and check the codes again, it will be there.

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Jun 9, 2023 | 09:30 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,740

Likes: 2,669

From: SE Florida

Quote:

Originally Posted by raydav

I have AutoEnginuity. $150 for the basic and another $300 for the add-on. It doesn't produce codes, it produces text.
And two quad, live display units whose brand escapes me at the moment.

You need the codes if you want to fix this. Get Forscan.

Quote:

Originally Posted by raydav

But I really want the algorithm. Is it impossible to know what is in the computer?

There are many algorithms that turn on the check engine light. There are probably about 70 or so codes that can turn it on, and each one has it's own set of algorithms.

Jun 10, 2023 | 12:17 AM

#10

Wes444

Logistics Pro

Joined: May 2017

Posts: 4,667

Likes: 1,455

From: Muskogee, Ok

Sorry, but saying you have AE is akin to saying, but I prefer to use DOS after the iphone 24Super+ came out. You're talking technology that was dated over 10 years ago. Yes it's better than only knowing that the engine light is on, but it can't do what the current apps can do.

Like Sous said, if Torque even decides to work, it looks pretty, until it randomly shuts off the motor for no reason while driving down the highway and then self deletes all your pretty screen settings and pids and reverts to factory setup. For troubleshooting and logging tho, use the humble looking and free forscan

Jun 10, 2023 | 06:33 AM

#11

Sous

FTE Leadership Emeritus

Joined: May 2014

Posts: 27,359

Likes: 5,957

From: Lake Hartwell, GA

Quote:

Originally Posted by raydav

It doesn't produce codes, it produces text.

If a code was set, FORScan will retrieve it.

Start with the last link, the Q&A.

FORScan

Jun 10, 2023 | 08:22 PM

#12

raydav

Thread Starter

Mountain Pass

Joined: Feb 2005

Posts: 127

Likes: 0

From: APPLE VALLEY

Quote:

Originally Posted by 97-psd

Can you read live data from the truck? If it is under load while it happens, it could a high pressure oil issue that pops the code.

I have been reading injection control pressure, I think that is what it is called. It is a five digit number, and the first two digits kinda track the two digit MAP.