Lately it seems like it is taking my truck longer to "cool down" after driving. I realize there are some people that say there is no need for this period unless you have been towing, driving hilly/mountain roads where the turbo is constantly building a lot of boost, ext. But, I like to think that the little extra time I sit in the truck waiting might just possibly get me some extra time on my turbo.

Anyways...Lately it seem that it is taking longer for the egt's to come down. I use the commander and my egt gauge is in the manifold. I am currently visiting some family in Colorado and I went to pull the truck up into the driveway for the night and I took a video of the egt gauge with the cell phone (sorry for the crappy picture if you watch the video). The truck had not been started all day. It was 46 degrees when I started the truck to pull it into the driveway.

Vid. 1--Initial start up, no need to watch the entire thing. Just more of a reference point to show what the gauge started at.
http://www.youtube.com/watch?v=OXd-6...eature=channel

vid 2--At the 16 second mark is when the truck is pulled into the driveway and in park.
http://www.youtube.com/watch?v=sEHyo...eature=channel

vid 3--Waiting for the gauge to show 400. I do not shut it down any warmer than 400.
http://www.youtube.com/watch?v=RLiQB...eature=channel

The truck was moved a total of about 20 feet. From the curb to the driveway. Keep in mind there is about a 15 second delay in between video 2 and 3 since I used my cell phone, I have to keep the videos under 30 seconds long otherwise I cant send them to my computer.

What do you guys think? Does this seem about right or a little long?

What is the best way to test the egt gauge? A bowl of water and a meat thermometer to compare to?

 

I think the pyrometer is off

I have an Isspro Pyro on my 03 and had the Juice monitor on my 01. Also had an Autometer pyro in my 01 at one time.

All of them seem to be very similar in temp readings between idling and cool down.

They are way different then yours.

Idling, my egt is aroun 250 or so. With the high idle at 1000 RPM, its around 300.

First startup when cold it might peak over 300 to 350, but always settles down.

I notice my auto takes way longer to cool down compared to my manual. When downshifting the manual, egts cooled down quick, the automatic, not so much. I would say to get to 300 deg, my 01 would usually only take 10 seconds or so. 03 takes maybe 20-30 seconds.
Honestly, yours seem like it is 100 deg off or more.

 

20-30 seconds to get to 300! wow If I were to wait for my gauge to read that I might as well not even shut down the truck when I go into stores.

Is it common to faul/break pyrometers? Do they need to be cleaned ever? I would have to check my records, which I dont have with me, but I have only had that pyro in there for a about a year.

 

That varies with temperature, and it won't really drop to 300 with the AC on and 90 deg temps, but with temps in the 50s or 60s like now, its about 20 or 30 seconds.

All 3 pyrometers I have had read about the same.

 

have you just noticed this since you have been in colorado? and where in colorado are you? I will promise elevation plays a pig factor in egts ideling or blasting up the mountains. I was working there few months ago and it would take a bit for it to cool down to get below 400 and thats when it was 0 outside. i would hit 1400* with the smarty on sw 3 going to work everymoring. but thats about 10,000 ft to 12,000 ft in elevation

 

I am in Aurora right now. I think the elevation here is about 5,400 ft. I go to school in Laramie, Wyoming and the campus there is at 7,200 ft. I notice it both in Laramie and here in Colorado. Lately it seemed like it was taking a little bit longer than usual to cool down but the last couple days it has seemed worse. Especially since the truck had not been started all day long, ran for about a minute and was only moved like 20 ft.

I am used to seeing some higher temps driving some of the mountain roads in wyoming. There is not much air up around 13,000 ft