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2001 7.3.... 650 mile drive each way, unloaded... truck ran fine there, but about half way back on the return trip I noticed my EGT would not come down below 800* and on flat ground if I tried to maintain 65mph it was creeping up into 1200* range. I pulled over and left truck running while checking for anything obvious that would cause it. Stopped for gas after nursing it for awhile, turned motor off. Restarted motor and it ran perfect again the entire way home.
Just got back from a trip pulling a 6000lb load 200 miles each direction... there was no problem... on the way back I stopped for food and turned the motor off. Turned it back on and got on the freeway and noticed the same problem as before... the ONLY thing I could think of when comparing to the previous time this happened was the restart. So I turned the key off while rolling straight and flat and turned the motor right back on and everything was perfect again even in desert temps and steep grades.
Any scenarios where this isn't just a bad gauge? When I was reading the high temps, the gauge appears to be functioning perfectly, except it's "zero" is at like 300-400*.
In theory a EGT gauge gets its movement voltage solely from the thermocouple probe, on a "cold" start the needle should always read near ambient. I dont see how a restart would affect anything on one unless the input wire is shorted inside on the illumination voltage wire
Was thinking this could be a possibility because of the way the gauge resets itself and zeroes out. Before I replace it, I was just curious if something else could be causing the symptoms I'm seeing.
Originally Posted by Wesley Green
In theory a EGT gauge gets its movement voltage solely from the thermocouple probe, on a "cold" start the needle should always read near ambient. I dont see how a restart would affect anything on one unless the input wire is shorted inside on the illumination voltage wire
I used to have the same problem with the same gauges, it seemed to be linked to talking on an old Nextel phone mostly using the two way radio. Since work went to using iphones I haven't noticed the problem. Not sure how or why it would mess with the gauge, but that was my observations. I still have the same gauges and no issues in a long time. When it would happen, I would restart at the next traffic light and all was back to normal.
A few years ago the microprocessor in my EGT gauge (ISSPRO EV2) wigged out and would act similar to what you describe. Although, instead of reading high and the needle moving, it would just freeze at 300 degrees sometimes and sometimes it was fine. I called ISSPRO and their tech service sent me a new gauge free of charge and that gauge has been working great ever since.
I believe the issue is with the gauge. If you like, You can ohm out the wires between the gauge and the sensor, once it is found. Remove the plug on the sensor and the plug on the back of the gauge and check for wiring integrity. Move the wires around a bit and keep checking for integrity. This will give you a pretty good indication of the wires or the gauge is at fault, but my money is betting on the gauge is faulty.
I appreciate all the responses! I was able to confirm it is a gauge issue.
While towing last week the same thing happened... gauge was showing super high EGT temps. I keyed ignition off to reset the gauge, and I saw it doing weird things while it was trying to zero itself out... this time it went to 1600* and stayed there solid. Keyed the ignition off again and it reset back to zero successfully and started working normally again.
I've sent an email to Pricol and tried calling their US number, but no response and I have not been able to actually get anyone on the phone... from what I am seeing, they don't even make these consumer gauges anymore?
SO, I need to replace it with something else, and while I'm at it, I'd like to add a boost gauge, which means I need to replace my double pillar gauge pod with a triple.
Recommendations for new EGT/Boost gauge and pillar gauge pod?
...While towing last week the same thing happened... gauge was showing super high EGT temps. I keyed ignition off to reset the gauge, and I saw it doing weird things while it was trying to zero itself out... this time it went to 1600* and stayed there solid. Keyed the ignition off again and it reset back to zero successfully and started working normally again...
I've seen this very same behavior on a gauge with a bad electrical connection from the probe. Repairing the connection cleared the problem right up.
I appreciate all the responses! I was able to confirm it is a gauge issue.
While towing last week the same thing happened... gauge was showing super high EGT temps. I keyed ignition off to reset the gauge, and I saw it doing weird things while it was trying to zero itself out... this time it went to 1600* and stayed there solid. Keyed the ignition off again and it reset back to zero successfully and started working normally again.
I've sent an email to Pricol and tried calling their US number, but no response and I have not been able to actually get anyone on the phone... from what I am seeing, they don't even make these consumer gauges anymore?
SO, I need to replace it with something else, and while I'm at it, I'd like to add a boost gauge, which means I need to replace my double pillar gauge pod with a triple.
Recommendations for new EGT/Boost gauge and pillar gauge pod?
Glow shift gauge pods are very reasonable. I use Autometer gauges, everyone has their preferences....
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