Help please. Gauge reading 260+ but ECU temp sensor never goes over 215???? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 06-19-2017, 07:02 AM   #1 (permalink)
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Help please. Gauge reading 260+ but ECU temp sensor never goes over 215????

New problem. Looking for some help understanding this situation please. Last weekend in 110+ degree weather, my temperature usually floated between 200 and 215 when Iím crawling. It would only hit 220 unless itís a long climb and comes back down quickly once I crest the hill or back off the throttle. No problem. Twice this weekend the gauge randomly went seemingly out of control and eventually hit 260(?)+ for an hour or so. It floated around between 230 and the A in Auto Meter. AT THE SAME TIME, the temp sensor for the ECU (I monitor with my Ipad) never broke 215. The engine didnít feel hot. Coolant never boiled over. No limp mode. Didnít run any different. Nothing I did to get the temp down as quickly as possible go it to go below 240. Then as randomly as it went out of control, it went back to reading normal again. So either the gauge just went crazy for a while (itís a mechanical gauge, so there thereís no possibility for a short), or I have a legitimate hot spot in the head where the temp sensor is (passenger side rear head). Iím trying to understand how this is possible and what I need to do about it. The front steam ports are hooked up properly, but the rear ones are still plugged (OEM configuration). No visible leaks or problems. Any help is appreciated.
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Old 06-19-2017, 11:23 AM   #2 (permalink)
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What's the vehicle? Engine?
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Old 06-19-2017, 11:29 AM   #3 (permalink)
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Probably just a lil bit of air on the system. The leaning and tilting the truck can make it float around and get trapped. In a new pocket.

Fillit up and crack the sender loose. Till it leaks a bit. Treat it like you would a fresh motor start up
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Old 06-19-2017, 12:09 PM   #4 (permalink)
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What's the vehicle? Engine?
Sorry. 6.2 L92 in a LJ.
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Old 06-19-2017, 12:10 PM   #5 (permalink)
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Probably just a lil bit of air on the system. The leaning and tilting the truck can make it float around and get trapped. In a new pocket.
That's what the consensus seems to be as I ask around this morning.
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Old 06-19-2017, 12:41 PM   #6 (permalink)
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My buddy had a hell of a time air bleedi,g his fresh start ls. Diisconnect the steam hose on the head and pump coolant out by cranking the motor.
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Old 06-19-2017, 01:21 PM   #7 (permalink)
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From what i gathered, the ECM reads the temp from the front of the drivers side head and your temp gauge is reading from the rear passenger head. Pretty sure the hottest reading will always be from that rear port on the passenger side (the internet told me this was the case). When comparing my temps in the app, i get a 20-25 degree difference when compared to the gauge.

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