Random Temperature Changes
Thread Starter
|
Junior User
Joined: May 2006
Posts: 74
Likes: 0
From: Orlando, FL.
Random Temperature Changes
My typical idle temp is somewhere in the range of 360-380 when the truck is hot. On occasion, maybe 1/20 starts it idles around 600 and the temp won't drop. If I turn off and restart, it is fine. Any ideas on if a system is failing, or if it is just the gauge acting up? (Autometer Cobalt Gauges)
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 11
From: Arizona
Well if it is turned off it should be closed, don't know if anything that would pull it open. Could be the EGT probe is defective or there is a loose ground to the gauge. Also you may want to call and ask Matt his opinion.
Does the idle speed change and does it do it with the engine warm, cold or both?
Does the idle speed change and does it do it with the engine warm, cold or both?
Thread Starter
|
Junior User
Joined: May 2006
Posts: 74
Likes: 0
From: Orlando, FL.
It does it both warm and cold, if it's going to do it, the temp shoots up the minute I start the truck. Idle stays the same, power is fairly normal, maybe a little bit weaker when running hot.
Postmaster
Joined: Apr 2004
Posts: 2,654
Likes: 0
From: Bossier City, LA
It is probably NOT the thermocouple. When they start going bad, they jump over the entire range. (just changed one Wed. night on one of my compressors) They will jump back and forth. IE Temp usually ran ambient on the stage that was floated in the compressor 85-95 deg F it would jump from 87 to 196, then to 95 then to 148 ect. ect. The shutdown was set at 300 deg, and it spiked there several times, hence the reason for me getting called out. I would check the gauge ground, but again it would act much the same way if the ground was bad. I would check the connections on the thermocouple and at the gauges, 99% of the time you will find the problem at the connector.
Junior User
Joined: Jan 2007
Posts: 99
Likes: 0
Originally Posted by blackhat620
Well if it is turned off it should be closed, don't know if anything that would pull it open. Could be the EGT probe is defective or there is a loose ground to the gauge. Also you may want to call and ask Matt his opinion.
Does the idle speed change and does it do it with the engine warm, cold or both?
Does the idle speed change and does it do it with the engine warm, cold or both?
Trending Topics
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 11
From: Arizona
Originally Posted by LiftedBlackHD
If it is gunked up, gases can flow through it even when closed. The "gunk" won't allow it to fully close.
Also if the EGR valve is stuck partially open you will have other driveability concerns and symptoms.
As mrxlh said, check the connections at the gauge and thermocouple.
Last edited by blackhat620; Jun 23, 2007 at 02:08 PM.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
