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Coolant temp sensor voltage source


Proven Member
Nov 3, 2004
Raleigh, North_Carolina
I would like to know where the coolant temperature sensor gets its power from. For some reason I'm not getting any voltage to my coolant temperature and I think that's the cause of my car running like s**t and not producing any power. I've replaced piston rings, bearings, head gasket (cometic), etc and my compression is in the 160's, I've replaced the turbo (evo 16g), I've checked for boost leaks numerous times and wherever I had leaks I've fixed them (injector insulators, shaft seals, isc flange), I've replaced everything ignition related (plugs, wires, coil pack, power transistor). I've tried adjusting my ignition timing to the right point but with the CAS all the way over to the left, I still can't get my base timing below 9 degrees btdc at 750rpm. I'm sick of my car feeling really sluggish and not producing any power, it makes boost just fine but the rpm's climb really slowly and there isn't much pull.


Proven Member
Jan 29, 2003
Worcester, Massachusetts
It gets power from the ECU. The sensor works by making resistance based on it's temperature. If your not getting any power through it check the plug pull it apart and make sure the wires didn't break inside or corrode really bad.

You must be timing the car wrong if your getting 9* for your base setting. It might idle fine like that but your ECU is going to advance the timing too much you might be causing knock if that's what your timing really is. check this site out for info on timing
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