EGT probe question

[K_Arts]

Question on the probe itself. When I go to turn my truck off, I idle at 400 degrees pre turbo. I have talked to a couple of people here in Colorado and they all shut off their vehicles at 300 degrees. Being that I can not get my truck below 400, is it possible that my probe is in too deep? If so, (I have the Autometer 5244 probe) how do I back off that compression fitting to pull the probe out a little? Or do you guys have any clue where I can purchase one of those Autometer compression fittings??

Thanks

Kev

 

[KevinK]

Mine will cool down to 300 degrees pre-turbo as long as I'm in Park. If it idles in drive, it will never go below about 425.

Kevin

 

[StakeMan]

Mine drops to 350 post-turbo within 30 seconds of putting it in park. Thats where I shut it off at.

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2001 Flame Red Sport, Auto, 4. 10, 4x4, LOADED!, DC Sport Brush Gaurd, DC Painted Running Boards, DC Splash Gaurds, Line-x over the rails, BFG AT/KO 285-75r16

1998 Durango SLT+

2000 FL60, 16 ft. Flatbed, Cat Powered

 

[K_Arts]

See the strange thing is that I have let mind idle in park for over 3 minutes. . and I can not drop below 400 degrees. So that is why I was wonding how I can get that compression fitting to actually move so that I can pull the probe out a little.

Do you think that if I pull the probe out a little that my temperatures will differ?

Let me tell you my scenario. I have a 1/4" hold drilled and tapped in my Manifold. I have a brass 1/4 to 1/8 fitting and then the Probe adapter. . (1/8) is screwed into place with the probe attached. This brass fitting wouldn't be causeing a temperature difference would it?

Thanks for the help guys.

Kev

 

[big barney]

After reading this you guys have me wondering. I have the Genos combo guage with the 1/8 npt fitting. I have it installed pre turbo. Mine will get down to 250 degrees if I let it idle for a minute or so. The highest temp I've seen is 1000 degrees does this sound normal? I have 99 with a six speed. Do you think the sensor is okay?

 

[TowPro]

Sounds like the same temps I see in my 98. 5. And I feel my gauge reads about 100 deg low all the time. Its going back to Isspro next week for calabration check.

Originally posted by big barney:
After reading this you guys have me wondering. I have the Genos combo guage with the 1/8 npt fitting. I have it installed pre turbo. Mine will get down to 250 degrees if I let it idle for a minute or so. The highest temp I've seen is 1000 degrees does this sound normal? I have 99 with a six speed. Do you think the sensor is okay?

 

[Shleets]

Originally posted by big barney:
After reading this you guys have me wondering. I have the Genos combo guage with the 1/8 npt fitting. I have it installed pre turbo. Mine will get down to 250 degrees if I let it idle for a minute or so. The highest temp I've seen is 1000 degrees does this sound normal? I have 99 with a six speed. Do you think the sensor is okay?

Sounds exactly like the temps I am getting. I have mine installed pre-turbo. VDO Vision series with the 1/4 fitting for the thermocouple. If I let it idle it will go to about 250. Never seen 1000, even really hard on the accelerator on the freeway. I just put them in a week ago and have not towed anything yet. #ad




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Mark Schlueter
2001, QC, 4x4, ETC, K&N, White sport package. Kodiak Sidewinder Steps (front and rear). Mag Hytec diff. cover. Wet Okole seat covers with Rams head logo. VDO Vision Gauges. Three hole "A" pillar mount from Geno's. Mag Hytec Trans pan on order.

 

[Wiredawg]

Mine idles between 225 and 250 degrees and about 450 at idle w/ the exhaust brake engaged. I have the DiProcal setup from TST. I've had mine up to 1200 degrees towing my 15K lb 5th wheel up 6% grade at 65 MPH. #ad


Wiredawg

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2000 4X4 SLT QC 8' bed; 6 spd, 3. 54 ; BD exhaust brake and 4" exhaust syst; TST PM2; Airlift Super Duty rear air bags; RS 9000 shocks; pyro/boost gauges in 2 gauge a-pillar mount; back preasure gauge mounted under dash; KN air filter; Brown's Welding brush/grill guard, rear bumper & headache rack; nerf bars and aluminum roll top rear cover, Warn front receiver and Hadley air horns, 20K Reese hitch.

[This message has been edited by Wiredawg (edited 01-11-2001). ]

 

[K_Arts]

Soooo, if you guys really don't mind me asking... I really haven't gotten my question answered. Do you think that my probe is in too deep? If so, how do I back it out? I tried adjusting the compression fitting... but it is not moving... PERIOD. I may have to cut it off. I am just wondering if the tip of my probe is too close to the manifold, resulting in it picking up higher temperatures from the manifold itself. Is this a logical guess or could my probe be messed up? Should I try a differenct on?? Maybe a different brand of probe? What do you guys suggest?

Thanks

Kev

 

[arlan]

Kev,
One thing you should not do is use a thermocouple of a different manufacture than your gauge. What temperature do you see when you first start your truck when it is cold? Mine, when the engine is cold is 225 in neutral and 400 in drive. As far as backing the thermocouple out, I had to replace mine twice, and the last time I didn't insert it as deep and I didn't see a difference in temperatures. Contact Autometer and ask them. I have Westach gauges and they are great about replacing anything for free, no questions asked.
Arlan


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98. 5 ISB QC 3500 4X4 3. 54, PowerMax1, DTT TC & VB, TY303 225/70/19. 5's on Rickson Wheels, 275 Injectors, Mag-Hytec Transmission Pan/Differential Cover, 9000 LB Warn Winch, Ultra Board Running Boards, Westach Combo Boost/EGT Transmission Temperature & Fuel Pressure gauges, Pac Brake, 2-lo kit, CB, GPS, Rancho 9000's, ATS exhaust manifold, JRE 4" exhaust with muffler and resonator. Lifetime NRA Member

 

[Chris N5CWM]

Kev,

The most important part is letting the
temp stabilize. Not all temp probes,
gauges etc are going to be the same. They
will differ not only from manufacturer to
manufacturer, but even if I had the same
setup as you do (autometer Sport Comp in
mine, same probe as you) they will not be
the same exactly. Mine will cool down to
300 after idling for a minute or so. I have
seen as high as 1500 with the Power Edge
3 light box on high (3) during a quick run
thru the gears. I try to limit the EGT to
a max of 1300 or so continuous (towing a
load up a hill) etc.
Basically, if you idle for a minute or two
and the temp doesn't go any lower, then you
are safe to shut down. Realistically, the
best place to get shut-down related temps
are post-turbo. You could get fancy with
a 2-pole switch and another probe installed
post-turbo, so you could read pre-turbo temp
during the drive, then post-turbo for shut
down.
In conclusion, I say your readings are fine.
I don't know what would happen to the brass
fittings and threads if you tried to remove
them just to adjust the probe, which in my
opinion will not affect the temp at all.

-Chris

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'01 3500 QC 4x4 SLT, Dk. Garnet Red, tan interior.
Cummins ETC, 5-speed, 3. 54 anti-spin; Line-X
Auto Meter boost and pyro
gauges on A-pillar; Valentine One radar detector
May the Boost be With You!

 

[K_Arts]

Chris... Arlan,

Here is my scenario. When I first start my truck in the morning, the gauge reads about 300 then raises to 400 pretty quick. As soon as I put the transmission into Drive. The temp immediately goes up to 500 degrees.

Now whenever I go to shut down the truck, I put it into Park and let it sit. Like I said above, I have let the truck idle for up to 3 minutes and the temp won't go below 400 degrees. Though as soon as I put my truck into park the temp goes from 500 degrees to 400 degrees in a matter of 15 - 30 seconds. . then just sticks there. I just want to make sure that I am not going to damage my turbo from turning it off at too high of a temperature. I just don't understand how other guys that I know that have the same probe can see 300 - 350 degrees at shutdown and I can not. Also, 2 other guys that I know that just installed their Autometer gauges with the same probe can not see about 850 degrees. Why can I easily hit 1000? It seems like no matter what the situation, mine is reading about 1000 degress higher. So should I call Autometer and see if they will replace my probe?

Thanks for the info guys.

 

[big barney]

Thanks for the reply guys. I guess my guage is reading normal so I won't worry about it. I let it cool down to 250 degrees and shut it off.

 

[radixr]

Kev,

What does your gauge read BEFORE you start the engine? It could be reading high at all temperatures.

 

[dmurdock]

Kev, does your probe sit 90 degrees in relation to the manifold (i mean the bend in the thermocouple). I am getting to install the exact same thing this weekend and I noticed in the instructions that the spring lead from the thermocouple should be turned until it is 90 degrees in comparison to the flow of exhaust.


ps... my compression fitting (the part of it that goes into the manifold) is 1/4" (it's the one that came with the thermocouple. Why do I need an adapter... or do i?

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'01 Eth 3500 dually, no mods planned except maybe an amsoil filter & guages. See My Truck and also be sure to read What tools & methods to use for an easy 1st oil change!!!
"Be happy you don't get all the government you pay for. " -W. C. Fields

 

[StakeMan]

Kevin,
I sent my first egt gauge back because it was reading about 100 degrees to high. The gauges loose accuracy as the temp gets on the low side of the scale. I would talk to the manufacture and see if they will send you at least a new gauge. Before I start my truck in the morning it will read 50 deg.

 

[Red360]

If you have the 1/4" probe, the regular copper tubing compression fitting will work. Actually this compression fitting is the same one they use.

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2000 24V, 6-speed, Flame Red, Agate leather, 3500 QC, 4X4, SLT+, 4:10's, LSD, AMSOIL Air/Bypass filters and all Fluids, 275 RV squirters, S. S. nerf bars, Line-x, Pyro/Boost/Fuel Press gauges.

 

[Sean Flanagan]

I usually try and let mine cool to 350. Even if I let it idle for an hour I don't think it would ever get to 300. When I start it, the temp immediately goes to about 325.

 

[zman]

K_Arts -

I was under the impression that the magic 300 degree shut down temperature was POST-turbo. Not sure what that would equate pre-turbo, but it would definitely be higher than 300 degrees - probably more like 375 to 400. I'm guessing that you are probably OK shutting down at 400 degrees pre-turbo.

Steve

 

[K_Arts]

Well. . as for as my temps before I start my truck. When I turn my truck off the gauge jumps to about 600 degrees. So the gauge needle is still there in the morning before I start my truck. If I cycle my key but don't start the truck the gauge reads about 100 degrees. Hope this helps.


Stakeman - I'll let you check it out this weekend at the meeting.

Kev