false oil temp readings - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 15 (permalink) Old 11-01-2010, 03:00 AM Thread Starter
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false oil temp readings

Someone mentioned reading about this once before and i have searched for over an hour and have not been able to find it.

Something about some scan tools reading the oil temp incorrect and showing a 30 or 40 degree diffrence if i remember correctly?

anybody have any info on this and a way to fix it? or what trucks specifically do it.

Got a customers truck did a new oil cooler and egr delete last week and he brought it back for coolant loss, quick test drive showed oil temp at 215 and coolant at like 175. They did have a radiator hose that was leaking and they repaired it and were overfilling the resivoir so this may be thier only problem, But just curious on what i saw on my MATCO Determinator Scan Tool

Thanks Travis

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post #2 of 15 (permalink) Old 11-01-2010, 04:32 AM
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Re: false oil temp readings

My scangauge reads my oil temp about 40 too high. I contacted Aeroforce about it and they said Ford may a supplied them with a incorrect formula to calculate oil temp. They said it has happened before with the OBS trucks. Wonder if Matco has the same issue...

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post #3 of 15 (permalink) Old 11-01-2010, 04:35 AM Thread Starter
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Re: false oil temp readings

might be it doesnt do it on everytruck though just ceartin ones

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post #4 of 15 (permalink) Old 11-01-2010, 11:09 PM
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Re: false oil temp readings

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Originally Posted by moremph View Post
Someone mentioned reading about this once before and i have searched for over an hour and have not been able to find it.

Something about some scan tools reading the oil temp incorrect and showing a 30 or 40 degree diffrence if i remember correctly?

anybody have any info on this and a way to fix it? or what trucks specifically do it.

Got a customers truck did a new oil cooler and egr delete last week and he brought it back for coolant loss, quick test drive showed oil temp at 215 and coolant at like 175. They did have a radiator hose that was leaking and they repaired it and were overfilling the resivoir so this may be thier only problem, But just curious on what i saw on my MATCO Determinator Scan Tool

Thanks Travis
The Matco scan tools reading for the oil temp isn't correct. I think I was the one who brought it up in the thread. A buddy of mine has one, and when we do head gaskets or oil coolers, we have to go to use his computer at the dealership. He was never given an answer from his Matco rep about the issue.
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post #5 of 15 (permalink) Old 11-02-2010, 12:20 AM
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Re: false oil temp readings

Don't you have the option to alter the formula on these?... Maybe not.

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post #6 of 15 (permalink) Old 11-02-2010, 01:02 AM
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Re: false oil temp readings

i have also seen some aftermarket programmers cause this issue aswell

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post #7 of 15 (permalink) Old 11-02-2010, 03:20 AM Thread Starter
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Re: false oil temp readings

well i was playing with it toight i told the scan tool it was an 04 truck which for some reason has 2 oil temp readings one was high and one was dead on. So i guess its just an 05 thing

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post #8 of 15 (permalink) Old 11-02-2010, 03:41 AM
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Re: false oil temp readings

truck that did it to me was an 05

2002 ext. cab lwb 4x4 7.3
05 front 08 rear conversion
4in lift,forged rod motor,tunes by tsd,bts trans,6.0 transcooler,6 autometers to watch,studs,springs,push rods,238cc hybrids,itp reg return,stealth hpop,tsd custom fuel system and sump,an so on
6.0's pay the bills and 6.4's soon..
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post #9 of 15 (permalink) Old 11-03-2010, 07:12 PM
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Re: false oil temp readings

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Originally Posted by moremph View Post
well i was playing with it toight i told the scan tool it was an 04 truck which for some reason has 2 oil temp readings one was high and one was dead on. So i guess its just an 05 thing

Thanks Travis
Truck that did it to me was an 07. Could be on to something.
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post #10 of 15 (permalink) Old 11-03-2010, 08:14 PM
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Re: false oil temp readings

On my 06, I datalogged with my X-cal2 before and had some ridiculous temps. I can't remember if it was coolant or oil that was way off, but one of them was. I want to say it was coolant though. It started at 475* (on a warm motor) and as I drove it just continually fell to around 80* until I shut the truck off. Never figured it out and it didn't do it again...

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