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mellinator2k

14 November 2018 01:18 PM

Car temp sensor dropping to 0 under boost

Hi Guys

I have a gc8 sti v3. The temp sensor gauge in car seems to drop near zero at times under boost/at speed. When I let off boost the temp seems to head to the middle again.The temp gauge drops at a controlled speed - it does not do it erratically like an electrical issue would.
I do have a new thermostat which opens a little earlier, but the car was doing this even before that was replaced.
Could it be a temp sensor issue?
Just trying to logically understand why it happens, if it is common and how I fix it

peter zippy reid

14 November 2018 01:33 PM

Not be better getting a mechanic to look at it as you have changes the stat and its just the same
if your in the halfway go see john in flemington industrial estate

mellinator2k

14 November 2018 03:51 PM

cheers mate, what is the name of his business?
You in the Cambuslang area aye?

peter zippy reid

14 November 2018 03:55 PM

I work in halfway and have used john on all my 6 imprezas
J D Auto Repairs
Unit 1 Flemington Industrial Estate Hamilton Road
G72 7TN Cambuslang

Vxr2010

14 November 2018 04:52 PM

I take it the car is running ok , no hg issues , i’m thinking possible old battery is every thing else electrical suffering ? poor earth ? poor alternator ? try a voltage tester , 12v or so when off , cranking around 9.6 plus under load, and 14 or so when charging

mellinator2k

14 November 2018 08:17 PM

Thanks for garage info - always good to know I have a garage near by which is trusted and has worked on Subaru’s!

Car runs great - can I ask why you suggested possible head gasket? Doesn’t not do it while revving at idle only revs at speed

Vxr2010

14 November 2018 08:49 PM

I remember when my hg went coolant temp was all over the shop , i assume when air was where coolant should have been so it had no coolant to test the temp of so gauge showed cold , i’m sure if car is running fine then it’s ok , i’m still thinking battery charging related issue

mellinator2k

14 November 2018 09:02 PM

Cheers mate! Funny enough I am thinking of putting in a very light weight battery. Car is a weeeknd car on a trickle charger. Anyone got any battery suggestions?

Vxr2010

19 November 2018 11:20 AM

Any updates on your fault ? i would just do a standard battery even more so if it’s trickle charged , i have two cars garaged on trickle charge and have just left batteries as they are , the trickle charger is on for 2 to 3 hours a day as it’s on a timer

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