Engine "derates" on long hard pulls
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Laughing Gas
Joined: Oct 2007
Posts: 990
Likes: 1
From: North Pole Alaska
Engine "derates" on long hard pulls
My truck has "derated" a few times recently on some of our long hard pulls. (8 mile long steep grades 12,000 lbs trailer). I can ussually pull the hills at 55 mph all the way to the top. I loose power and the little "wrench" light comes on. If I pull over and shut the truck off, I can restart and accelerate to 55 and finish the hill. Took it to the Ford Dealer (Seekins) and there are no codes.
????? any guesses?
????? any guesses?
Posting Guru
Joined: Jan 2009
Posts: 1,321
Likes: 0
From: Mattawa Washington.
Any gauges to tell if the temps are getting too high.The computer monitors quite a bit of stuff and anything getting in the danger zone for the engine and transmission can make it detune..
More Turbo
Joined: Feb 2005
Posts: 574
Likes: 3
From: Grand Rapids,MI
No tuner so the computer is telling you temps are getting close high temps. My neighbor came over one day and said his wrench light came on and I asked him what he was doing ,pulling about 35000 pounds of round bales will 100= hp tune I told him he got lucky he didnt melt the turbo or pistons.
Lead Driver
Joined: Oct 2009
Posts: 5,406
Likes: 229
From: Pa
My truck has "derated" a few times recently on some of our long hard pulls. (8 mile long steep grades 12,000 lbs trailer). I can ussually pull the hills at 55 mph all the way to the top. I loose power and the little "wrench" light comes on. If I pull over and shut the truck off, I can restart and accelerate to 55 and finish the hill. Took it to the Ford Dealer (Seekins) and there are no codes.
????? any guesses?
????? any guesses?
EOT/ECT more than 15* apart. Could be a sign of a failin oil cooler/egr cooler. I believe the newer 6.0 monitors and defuels if variance gets to high.
Junior User
Joined: Nov 2010
Posts: 80
Likes: 0
you say you have a egr delete. some say on your year the fan gets screwed up with a egr delete with out custom tunes. did you hear the fan come on. do you have temp read outs? not the ones from ford. that's along pull with a good size load. did it ever do this before the egr delete? I thinks that might be it. But what do I know I'm just a dumb plumber!
Freshman User
Joined: Mar 2010
Posts: 35
Likes: 0
From: Monroe, NC
My truck did this once while pulling my 7k trailer. Started up a small hill and half way up the tranny downshifted and next thing I know my speed is decreasing and wrench light comes on. When it happened I quickly looked at my boost gauge and it was around 30. Turned out to be a overboost situation.
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Posting Guru
Joined: Jan 2009
Posts: 1,321
Likes: 0
From: Mattawa Washington.
you say you have a egr delete. some say on your year the fan gets screwed up with a egr delete with out custom tunes. did you hear the fan come on. do you have temp read outs? not the ones from ford. that's along pull with a good size load. did it ever do this before the egr delete? I thinks that might be it. But what do I know I'm just a dumb plumber!
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Fleet Owner
Joined: Nov 2003
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Has your fan ever come on to your knowledge - especially on your "hard pulls"? As mentioned previously, this would be a good place to start the investigating. It also could be water pump and/or thermostat related.
Since it is a recent change in performance, it sounds like you might also be generating more heat than you used to (in addition to not effectively removing the heat).
Are you losing any coolant?
Do you have a tuner? studs?
When was your last flash update?
Since it is a recent change in performance, it sounds like you might also be generating more heat than you used to (in addition to not effectively removing the heat).
Are you losing any coolant?
Do you have a tuner? studs?
When was your last flash update?
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
I was under the impression that if the wrench light came on a code was set.
Perhaps your dealer doesn't have the latest software on their computers to properly read newer codes? You might want to check with the dealer, or with a different one.
Knowing the code could go a long ways towards knowing the problem.
Perhaps your dealer doesn't have the latest software on their computers to properly read newer codes? You might want to check with the dealer, or with a different one.
Knowing the code could go a long ways towards knowing the problem.
Thread Starter
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Laughing Gas
Joined: Oct 2007
Posts: 990
Likes: 1
From: North Pole Alaska
Has your fan ever come on to your knowledge - especially on your "hard pulls"? As mentioned previously, this would be a good place to start the investigating. It also could be water pump and/or thermostat related.
Since it is a recent change in performance, it sounds like you might also be generating more heat than you used to (in addition to not effectively removing the heat).
Are you losing any coolant?
Do you have a tuner? studs?
When was your last flash update?
Since it is a recent change in performance, it sounds like you might also be generating more heat than you used to (in addition to not effectively removing the heat).
Are you losing any coolant?
Do you have a tuner? studs?
When was your last flash update?
not loosing coolant.
no tuner or studs done
and I have the latest flash
More Turbo
Joined: Mar 2003
Posts: 639
Likes: 1
From: Cool Arizona
same thing I just went through.first thing was the t-stat was bad.Next thing you know my egr cooler failed..
Cargo Master
Joined: Mar 2007
Posts: 3,103
Likes: 32
From: AB/BC
IMHO a new oil cooler is in your near future.The latest flash sets that wrench when the coolant and oil temps get too much spread.As was stated above the truck should have a code the dealer missed for some reason.
