2002 5.4 temperature sensors?
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Fleet Mechanic
Joined: Jul 2004
Posts: 1,988
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From: Travelers Rest SC
2002 5.4 temperature sensors?
Hey- Haven't been on here in quite a while- been busy building a house and shop!
I've had an overheating issue with a 2002 E-250, 5.4 engine. Really long story, and I think I just about have it wrapped up. In the process of working on it, I took out the ECT sensor (near the thermostat), and hooked up an aftermarket gauge. The stock gauge is useless; it stays in the normal range, then suddenly jumps to 'HOT' after it has overheated. I don't know if the gauge actually works this way, or if something's wrong.
The question is- Does the ECT sensor tell the computer what the engine temperature is? Apparently, it might also have a cylinder head sensor (CHT), and that might be telling the computer what's going on. I'd rather just keep the real gauge hooked up so that I can monitor the actual temperature, but I don't want my engine thinking that the engine has never warmed up. Anyone know if my engine has a CHT, and whether or not that's all I need for the computer? Does the factory gauge actually work as a gauge, or more of a fancy idiot light? Thanks in advance!
I've had an overheating issue with a 2002 E-250, 5.4 engine. Really long story, and I think I just about have it wrapped up. In the process of working on it, I took out the ECT sensor (near the thermostat), and hooked up an aftermarket gauge. The stock gauge is useless; it stays in the normal range, then suddenly jumps to 'HOT' after it has overheated. I don't know if the gauge actually works this way, or if something's wrong.
The question is- Does the ECT sensor tell the computer what the engine temperature is? Apparently, it might also have a cylinder head sensor (CHT), and that might be telling the computer what's going on. I'd rather just keep the real gauge hooked up so that I can monitor the actual temperature, but I don't want my engine thinking that the engine has never warmed up. Anyone know if my engine has a CHT, and whether or not that's all I need for the computer? Does the factory gauge actually work as a gauge, or more of a fancy idiot light? Thanks in advance!
Thread Starter
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Fleet Mechanic
Joined: Jul 2004
Posts: 1,988
Likes: 14
From: Travelers Rest SC
So the other sensor tells the computer what the engine temp is, right? What puzzles me is that the second the gauge jumps up to 'overheat', the engine goes into 'limp mode'. I had the opportunity to test this several times trying to nurse the thing home. Let it sit 20 minutes, and the gauge would be right back to normal. Drive a mile; bang, overheat, engine goes back into the safety mode. Does the sensor for the gauge give the 'overheated' signal, and not the CHT sensor?
I just want to be sure that I can drive the van without the ECT sensor without screwing up the engine control. Otherwise, I'll figure somewhere else to tap in to for the real gauge I added. If my engine thinks it's still cold, it will run really rich.
I just want to be sure that I can drive the van without the ECT sensor without screwing up the engine control. Otherwise, I'll figure somewhere else to tap in to for the real gauge I added. If my engine thinks it's still cold, it will run really rich.
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