High EGT's on stock program
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Elder User
Joined: Oct 2006
Posts: 600
Likes: 1
From: Albuquerque, NM
High EGT's on stock program
I have gauges on my truck and I'm working to running a chip but don't currently have a chip installed. I tow frequently and my 5th wheel probably weighs in around 8500 lbs. I see the egt's running up past 1200 frequently when I pull hills. I always back off of the gas when I see it getting too high, but I have seen it hit 1400. I thought the stock programming would keep the egt's around 1200. I mean, if I didn't have the gauges I would just put my foot in to it and not worry about it because its stock programming. Is something wrong with my gauge or the sensor or is my truck really climbing to those temps?
Cargo Master
Joined: Mar 2006
Posts: 2,502
Likes: 2
From: Bend Oregon
Drive pressure leaks or boost leaks are the two most common causes of high EGT's. Leaking up pipes or Exhaust manifolds, leaking boots in the CAC System or even a restricted intake a.k.a. clogged air filter.
Look for soot on the firewall leaks around the exhaust manifolds and any torn boots on the intercooler piping or a hole in one of the intercooler pipes. You can build a boost leak detector to simplify things.
Look for soot on the firewall leaks around the exhaust manifolds and any torn boots on the intercooler piping or a hole in one of the intercooler pipes. You can build a boost leak detector to simplify things.
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
I have gauges on my truck and I'm working to running a chip but don't currently have a chip installed. I tow frequently and my 5th wheel probably weighs in around 8500 lbs. I see the egt's running up past 1200 frequently when I pull hills. I always back off of the gas when I see it getting too high, but I have seen it hit 1400. I thought the stock programming would keep the egt's around 1200. I mean, if I didn't have the gauges I would just put my foot in to it and not worry about it because its stock programming. Is something wrong with my gauge or the sensor or is my truck really climbing to those temps?
Thread Starter
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Elder User
Joined: Oct 2006
Posts: 600
Likes: 1
From: Albuquerque, NM
I have a 2001 with 125,000 miles. I have run a 6637 air filter since 66,000 miles. I keep it clean. I don't see any soot around my up pipes. I'm seeing 15-17lbs of boost, which I understand is normal. I don't see much dusting on my turbo wheel. I built a leak detector last summer and couldn't find any problems. I will have to pull it back out and start looking again. My inter-cooler boots are stock, never replaced and I do see a small amount of grime around the upper boots, but other then that everything seems pretty normal.
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
I have a 2001 with 125,000 miles. I have run a 6637 air filter since 66,000 miles. I keep it clean. I don't see any soot around my up pipes. I'm seeing 15-17lbs of boost, which I understand is normal. I don't see much dusting on my turbo wheel. I built a leak detector last summer and couldn't find any problems. I will have to pull it back out and start looking again. My inter-cooler boots are stock, never replaced and I do see a small amount of grime around the upper boots, but other then that everything seems pretty normal.
When your pulling at what altitude are you at? I do know a bone stock 7.3 pulling a good load on grade will go over the 1250 mark above 9000 feet. Not by much but it will sit right at the 1250-1300 mark on a heat soaked motor.
Stock boots are just fine if they seal. I'd double check your charge side piping to be sure and make sure you are leak free. No reason to replace the boots if they are not damaged. Rarely do thermocouples go bad and read higher than they should, but I have seen it before.
Oil buildup around the boots is normal, its simply oil condensate from your crankcase vent. If you want it dry and do not have strict emissions in your area, vent to atmosphere. It coats the intercooler with oil internally as well. This will not cause your heat issue though.
I assume the truck is bone stock besides the intake?
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Elder User
Joined: Oct 2006
Posts: 600
Likes: 1
From: Albuquerque, NM
stock other then fuel line cross over, tru-cool trans. cooler, john wood valve body, hutch, harpoon and the 6637. I live at a mile high and most of my towing is done around that altitude or higher. I pull some pretty steep grades.
Posting Guru
Joined: Sep 2014
Posts: 2,404
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From: Asheville-where weird is
Do you have a way of measuring MAP and EBP also...just to see if they are within the parameters with boost at KOEO? What is your EOT during this time?
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Post Fiend
Joined: Sep 2006
Posts: 7,426
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From: Sioux Falls, SD
In addition to MAP & EBP add Manifold Air Temps to the list. If you have the ability to datalog PID's.
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More Turbo
Joined: Oct 2013
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If this is the case, then would you expect to see some black smoke?
Posting Guru
Joined: Oct 2012
Posts: 1,910
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From: Hat Creek Ca
You might want to visit your boots just the same. Mine looked OK but when I had plenum inserts installed with the turbo rebuild the old boots were deteriorated from the inside and about all that was left was the exterior "fabric shell".
Laughing Gas
Joined: Jun 2013
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I'm no diesel mechanic and so maybe one of the gurus here could explain this. But on my late 99 7.3 I had the same issue as you, I could bury my foot in it and the egts would skyrocket, I had to pretty much drive by the pyro Espescially with any weight on. No smoke,no leaks that I could find, no soot, good boost, nuttin'. Then my HPOP went out and when I replaced it with a new one my EGT problem was gone, like night and day. All stock programming too.
Just my experience with a similar sounding issue
Just my experience with a similar sounding issue
Posting Guru
Joined: Sep 2014
Posts: 2,404
Likes: 3
From: Asheville-where weird is
I'm no diesel mechanic and so maybe one of the gurus here could explain this. But on my late 99 7.3 I had the same issue as you, I could bury my foot in it and the egts would skyrocket, I had to pretty much drive by the pyro Espescially with any weight on. No smoke,no leaks that I could find, no soot, good boost, nuttin'. Then my HPOP went out and when I replaced it with a new one my EGT problem was gone, like night and day. All stock programming too.
Just my experience with a similar sounding issue
Just my experience with a similar sounding issue
So, if it went away with a new HPOP, then the ICP must have been low. Were you able to monitor it prior to replacement. I would think that low ICP would throw a code. Anyway, it comes down to fuel atomization, with low ICP, it would be minimal, and also with the time that it takes to get the prescribed amount of fuel injected into the cylinder: it would take longer. If you were able to monitor it, what was FIPW? As a rule of thumb, anything beyond about 3.0ms tends to increase EGT's