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Old 03-07-2012, 05:27 PM   #1
Scooby Specialist
Member#: 305343
Join Date: Dec 2011
Chapter/Region: VIC
Location: Abbotsford, BC
1996 WRX STI Wagon
Dark Mica Blue

Default Coolant Temp Sensor compromised?

Recently I undertook the task of tracking down a hesitation issue. To be as descriptive as I can it's as if the car is being hit by gusts of wind, most prominent when cold and just cruising away (still happens at WOT on the highway). Anyway I currently have the intake manifold off and am replacing anything and just about everything that looks in poor shape.

Naturally now would be a good time to check the CTS and im kind of glad I did as the sensor was coated in a sort of sticky yellow paste. The photo below shows the tip cleaned off while the rest of the sensor is still covered in the unknown substance.

My question is, does this look normal? Never had a CEL for the CTS and besides the random hesitation, the car seemed to drive well (albeit maybe a little rich). Either way the sensor has been replaced but I was more or less curious if anyone else has come across this. Going to be sure to put subaru approved coolant and probably some conditioner in.

Engine = EJ20K, stock, 70,000km.

Sorry about the novel, wanted to be sure I got all the information in there.
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Old 03-07-2012, 10:06 PM   #2
Elbert Bass
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.

Not sure if they are valid specs for your car (I only have access to US model specifications) but the temp sensor should measure 2,000 to 3,000 ohms at 20 degrees C, 700 to 1,000 at 50C, and 300 to 400 ohms at 80C. If it measures in those ranges then the coolant sensor is NOT your problem.

The slime is normal and does not affect the sensor operation.
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Old 03-18-2012, 08:34 PM   #3
Scooby Newbie
Member#: 243590
Join Date: Apr 2010
Location: Windsor, vt
07 forester


my 04 2.5rs n/a fluctuating temp gauge overheat changed therm and rad cap better for few days but them temp fluct again and rad fans seem to cycle late changed cts now fans don't come on and temp red lines after couple minutes operating at idle . gonna pull therm and verify opening. any suggestions?
Have excellent heat inside through entire process before and now.

Last edited by 47businesscoupe; 03-18-2012 at 08:40 PM.
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