2000º+ Egt's!
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Joined: Oct 2004
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2000º+ Egt's!
A buddy of mine was driving over a freeway overpass this afternoon and his Edge/Attitude EGT read 2000F +/-. He has a full 4" turboback exhaust and the edge as previously mentioned. I think he was on the lowest setting and not towing anything at all at the time.
Some history on the truck-
It has 220000+ miles and recently puked ATF towing 10-12K toybox up a long grade 3 months ago.
He installed an aftermarket transcooler with a temp actuated fan. The edge/Attitude and the exhaust at the same time. After the install a week later the oil seals blew (Not sure if it was the rear main??). Had the seals replaced and now this excessive EGT problem. The thrmocouple is installed preturbo on the manifold (Exact location unkown).
He said that his boost was normal at the time. He pulled over and let it cool off for a while but again jumped to over 1600 within 1 mile. Stopped and called a tow truck.
Any ideas?
Some history on the truck-
It has 220000+ miles and recently puked ATF towing 10-12K toybox up a long grade 3 months ago.
He installed an aftermarket transcooler with a temp actuated fan. The edge/Attitude and the exhaust at the same time. After the install a week later the oil seals blew (Not sure if it was the rear main??). Had the seals replaced and now this excessive EGT problem. The thrmocouple is installed preturbo on the manifold (Exact location unkown).
He said that his boost was normal at the time. He pulled over and let it cool off for a while but again jumped to over 1600 within 1 mile. Stopped and called a tow truck.
Any ideas?
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
damn. 
even four seconds above 1800* is enough to dramatically shorten the life of the engine.... i bet the pistons have begun to start melting, if it actually got to 2000* by the way, the turbo is destroyed too, the vanes begin to melt around 1250* actual temperature, same with pistons (aluminum). so the EGT would have to be around 1900 for that to happen. hopefully it is just a malfunction that read that high. even pulling trucks dont get to 2000*
even four seconds above 1800* is enough to dramatically shorten the life of the engine.... i bet the pistons have begun to start melting, if it actually got to 2000* by the way, the turbo is destroyed too, the vanes begin to melt around 1250* actual temperature, same with pistons (aluminum). so the EGT would have to be around 1900 for that to happen. hopefully it is just a malfunction that read that high. even pulling trucks dont get to 2000*
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
It's nearly impossible he was seeing 2000 actual given the situation, and pretty unlikely that there is a problem with the thermocouple itself. That leaves the wiring and the gauge as the most likely sources.
Posting Guru
Joined: Aug 2004
Posts: 2,417
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From: Braham MN
Originally Posted by strokin_it7.3
the turbo is destroyed too, the vanes begin to melt around 1250* actual temperature, same with pistons (aluminum). even pulling trucks dont get to 2000*
and Pulling tractors do get to 2000*, but everything is coated with ceramics.
Most likely a wiring problem, my tranny temp was freaking out one day, turned out to be a bad ground at the amplifier box.
Diesel Rod
Elder User
Joined: Nov 2004
Posts: 798
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Originally Posted by 444dieselrod
Actually the Turbo vanes are Tungsten Steel, melt at 2200*+
and Pulling tractors do get to 2000*, but everything is coated with ceramics.
Most likely a wiring problem, my tranny temp was freaking out one day, turned out to be a bad ground at the amplifier box.
Diesel Rod
and Pulling tractors do get to 2000*, but everything is coated with ceramics.
Most likely a wiring problem, my tranny temp was freaking out one day, turned out to be a bad ground at the amplifier box.
Diesel Rod
Last edited by touchofgrey; Sep 19, 2005 at 12:47 AM.
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
yeah i know that it was most likely a wiring problem and that it would never happen under extreme conditions, but oh well.
about the vanes, i didnt know that. i heard someone here a while back say that they were aluminum, and would melt along with the pistons.
and i specified pulling TRUCKS not tractors. ive seen tractors in action and man is it something!
Actually the Turbo vanes are Tungsten Steel, melt at 2200*+
and Pulling tractors do get to 2000*, but everything is coated with ceramics.
and Pulling tractors do get to 2000*, but everything is coated with ceramics.
and i specified pulling TRUCKS not tractors. ive seen tractors in action and man is it something!
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Joined: Jul 2002
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From: South Dakota
Originally Posted by strokin_it7.3
about the vanes, i didnt know that. i heard someone here a while back say that they were aluminum, and would melt along with the pistons.
For analogy sake, its like comparing a aluminum boat prop to a stainless steel prop.
The steel prop will take a severe beating any show little wear and vice versa on the aluminum.
Postmaster
Joined: Dec 2003
Posts: 2,864
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From: STEPHENVILLE,TX!!!!!
bad thermo is what made it show so high, stock injectors cant make enought fuel to gettter that hot. plus forged pistons melt at 1800ish degrees. there would be nothing left of the motor if it got that hot. if al in a gas state made it out of the motor it would look like a greyish powdercoat on the impeller vains and that kinda heat even with stainless exaust impeller it would have started to melt the corners off the impellers.
i was thinkin bad thermocouple, bad power source, bad ground. diprocal had a rash of bad thermos a year or so ago. ive had one go haywire before that was a autometer. it was in my 94.5 for about 300k miles when it went wacky. autometer still replaced it for free.
i was thinkin bad thermocouple, bad power source, bad ground. diprocal had a rash of bad thermos a year or so ago. ive had one go haywire before that was a autometer. it was in my 94.5 for about 300k miles when it went wacky. autometer still replaced it for free.
