EGT gauge problems?
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Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
EGT gauge problems?
i think my EGT gauge is not accurate. some say that after driving at operating temp, they come in, let the truck idle to 350-300* before shutting the truck down. pulling in my driveway which is mostly idleing, i am at 450*, and it takes about a minute for EGT's to get below 350 or so. i let it drop to the 400* tick mark, and then shut her down- which is usually 15 seconds or so. but one thing i noticed, was that in the mornings when it is COLD, the EGT gauge will never move below 100*. is this normal to you guys? i dont think so, because mine seems to be about 100* hotter than everyone else i see or talk to. those of you that have gauges, does your EGT gauge sit at 200* when the key is off, then jump to the temperature (down) when the key is turned to "run"? mine has never gone below 100* when turned off, ignition on.
one thing i do notice, is that i can let my engine sit and idle for 5-10 minutes after driving, and the EGT doesnt get lower. sits at 350-300*. after that long, the EGT should be well below 300*. i can coast down the hill and get EGT to about 350, and it will actually raise the temperature just sitting and idling.
one thing i do notice, is that i can let my engine sit and idle for 5-10 minutes after driving, and the EGT doesnt get lower. sits at 350-300*. after that long, the EGT should be well below 300*. i can coast down the hill and get EGT to about 350, and it will actually raise the temperature just sitting and idling.
Elder User
Joined: Jul 2005
Posts: 533
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From: NorCal
Mine goes to zero when you shut it off. When you start it, it jumps up to like 100 or so and gradually increases to around 250. If I let my truck idle for 5 minutes or so in park or neutral the EGTs will drop to under 300 easily. Most of the times, it doesn't even take a minute for the EGTs to drop under 400 for me to shut her off, just 30-40 seconds and it'll be at 350.
Fleet Mechanic
Joined: Feb 2005
Posts: 1,797
Likes: 1
From: Northern Colorado
KOEO - cold engine - reads about 50º
After a mild run - 15 sec of idle - 400º - 425º
- idle 60 sec - 375º - 390º
doesn't want to come too much lower than that for a long time.
I don't know what the published accuracy of these pyros are but I doubt if they are all that great. My guess would be +/- 75º
After a mild run - 15 sec of idle - 400º - 425º
- idle 60 sec - 375º - 390º
doesn't want to come too much lower than that for a long time.
I don't know what the published accuracy of these pyros are but I doubt if they are all that great. My guess would be +/- 75º
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
Mine (Autometer) sits at 0 with the key off. I let it idle for 3-5 minutes tonight, just to see how low it would go. It barely got below 300* and it was about 45* outside. When I first go to start it and kick the key on, the temp usually shows about 10*-20* warmer than it is outside.
Elder User
Joined: Feb 2000
Posts: 737
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From: LAKE FORK TEXAS
I have an X Monitor (digital) Mine is very close to ambient when i turn the key on. At idle mine usually hangs between 245-249. After a hard run at the most maybe 2 mins and it is down to about 250 or so. I often wondered how accurate mine was.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
Originally Posted by MRBASS
I have an X Monitor (digital) Mine is very close to ambient when i turn the key on. At idle mine usually hangs between 245-249. After a hard run at the most maybe 2 mins and it is down to about 250 or so. I often wondered how accurate mine was.
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Elder User
Joined: Jul 2005
Posts: 659
Likes: 2
From: Berthoud, CO
On a colder morning, say 30 degrees, when I start mine, the egt sits at 190. When I pull back in, it is usually at 350-400, I let it idle for a minute or so, and it goes below 300. In the summer, it takes longer to idle to get below 300, but it always does. My probe is installed pre turbo FYI.
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Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
I just installed a pyrometer in a customers car yesterday. The guage read 100 degrees sitting in the box! But it was one of those kind that are self powered, just a thermocouple, a lead wire and a guage. On the test drive it seemed to function properly.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
Originally Posted by Kwikkordead
But it was one of those kind that are self powered, just a thermocouple, a lead wire and a guage.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by jtharvey
A self powered gauge?? Mine was sitting at abour 400* in the box, but of course the first time it got keyed power it dropped to 0* until I started the truck.
Senior User
Joined: Jan 2006
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Originally Posted by jtharvey
A self powered gauge??
Senior User
Joined: Apr 2004
Posts: 319
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mine has a thermopile to power the guage and sits a 100 F
called the mfg and they said it was normal for that guage (self powered ones uses a thermopile to produce millivolt current when two dissimular metals are heated , simular to a thermocouple on a water heater )
called the mfg and they said it was normal for that guage (self powered ones uses a thermopile to produce millivolt current when two dissimular metals are heated , simular to a thermocouple on a water heater )
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by jtharvey
Kwik, that's a very interesting design. It just doesn't seem like it should work at all. An electric guage with no power wires. Very odd.