EJ8 GSR-T

Hey everyone. I have a 98 civic, swapped with a turbo gsr motor. I am on a road trip right now from Houston tx to vancouver BC. I have made it to grants pass oregon but my car is having some serious troubles. The temp. goes way up and stays extremely high. Every so often it will flop down to normal and then just jumps around alot. I stopped today and had a new t-stat, radiator cap and coolant flush done. Still no luck. My next thought was head gasket problem but im thinking if that were the case it wouldn't cool down or fluctuate so much. The only thing i have done recently is change out my iridium plugs for coppers. Any ideas as to what could be doing this would be much appreciated!

marc-111

iTrader: (1)

how bout your radiator fan? is it working? try to jump it if it works......

slugo10

the fan is not going to matter at hwy speeds. I would change the temp sensor.

Unit44justin

Check to see if there are any leaks on the radiator.

EJ8 GSR-T

had a leak down test done, no leaks anywhere. The fan is working, i even jumped it for a leg of the trip to make sure that wasnt the issue. Both of the temp sensors are reading high. I just had one of them go out before the trip so i swapped it out, so im thinking its not the sensors. :-/

90_EX_Civic

stock gsr engine?

EJ8 GSR-T

no. built with forged internals and cams. the strange part is it runs just fine, i would think if there was anything serious wrong it would cough or sputter or something, just runs hot.

90_EX_Civic

dart block, or stock gsr block?

marc-111

iTrader: (1)

water pump???? probably it's gonna give in later on.......

90_EX_Civic

i was thinking in more the line if it's a dart block, the water ports and opening for the coolant are narrow, so it doesn't flow as well. or if he has a block guard, it might be a little bit to restrictive and he might have to make the holes in the block guard bigger.

EJ8 GSR-T

Its just a stock GSR block, with no block guard

Toonz08

there's lots and lots of reasons why a car would overheat, it may be one thing or a combination of a few. maybe there's air in the cooling system, the radiator might not be working correctly (or lots of debris on it), the radiator cap, a leak, old oil, water pump, ignition timing, exhaust system (check vacuum readings, pipes and converters), the radiator hose could of collapsed, even not having the 50/50 antifreeze can cause it to overheat. you might just have to eliminate what you think might be causing it to overheat one by one =/ gl

90_EX_Civic

okay, the what size radiator do you have? is is a have or a full size? and another advise id have to add is get a external water temp gauge. something to measure the temp better. cause re reading your post, but be okay but that one of your sensors or your cluster might be going wacko?