Swithed to a hotter t-stat, now.. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C&C Chevy · 12-16-2005, 01:07 PM

the truck is running like dog poop. Idles rough and the the coolant temps are all over the place. How would switching out a 180 stat for a 195 stat cause all this?

I'm guessing the computer is trying to adapt to the new stat??

beaterC10 · 12-16-2005, 01:15 PM

Quote:

Originally Posted by C&C Chevy

the truck is running like dog poop. Idles rough and the the coolant temps are all over the place. How would switching out a 180 stat for a 195 stat cause all this?

I'm guessing the computer is trying to adapt to the new stat??

Unless you have TBI, you won't have a computer.

**Captkaos** · 12-16-2005, 01:37 PM

That is weird, the '87 takes a 195 stat.

C&C Chevy · 12-16-2005, 03:57 PM

Quote:

Originally Posted by beaterC10

Unless you have TBI, you won't have a computer.

Se my sig.

capt., 180 stat is all I've ever used in the truck. I was under the impression that 195's were for colder climates.

Anyway, I put a 180 stat back in and the truck is running better.

piecesparts · 12-16-2005, 04:59 PM

doesn't sound like a T/stat to me. It sounds like you have water in that high priced gas that you have. I used to switch to a 195 T/stat for winters and then I got rid of the older truck. I live North of you about 300 miles and I run 180 degree T/stats all of the time. If you don't have a heating problem (due to a really big radiator) then you should not have to swap out the T/stat. If your heater is plugged, then changing will help some. As for your running rough, check for a good spark and then run some gas line treatment in the tank. If it has a EFI setup then put in some injector cleaner. ( The coolant temps are all over the place) Did you use a "Super Stat". If not then what you are experiencing is the T/stat full closed and then it "POPS" off of it's seat and then it is full open. (Run hot then run cooler) A "Super Stat is made to modulate better and then the temp is more controlled. Check with any Auto parts outlet They carry them under their name usually. We have NAPA, Carquest, and O Reilly's around here.

stueber68 · 12-16-2005, 05:04 PM

The computer controls fuel mixtures by reading engine temprature. The factory is a 195. Now, if a hypertech chip is installed in the ECM it requires a 180.

12-16-2005, 01:07 PM	#1
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Swithed to a hotter t-stat, now.. the truck is running like dog poop. Idles rough and the the coolant temps are all over the place. How would switching out a 180 stat for a 195 stat cause all this? I'm guessing the computer is trying to adapt to the new stat?? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

12-16-2005, 01:37 PM	#3
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: Swithed to a hotter t-stat, now.. That is weird, the '87 takes a 195 stat. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

12-16-2005, 04:59 PM	#5
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: Swithed to a hotter t-stat, now.. doesn't sound like a T/stat to me. It sounds like you have water in that high priced gas that you have. I used to switch to a 195 T/stat for winters and then I got rid of the older truck. I live North of you about 300 miles and I run 180 degree T/stats all of the time. If you don't have a heating problem (due to a really big radiator) then you should not have to swap out the T/stat. If your heater is plugged, then changing will help some. As for your running rough, check for a good spark and then run some gas line treatment in the tank. If it has a EFI setup then put in some injector cleaner. ( The coolant temps are all over the place) Did you use a "Super Stat". If not then what you are experiencing is the T/stat full closed and then it "POPS" off of it's seat and then it is full open. (Run hot then run cooler) A "Super Stat is made to modulate better and then the temp is more controlled. Check with any Auto parts outlet They carry them under their name usually. We have NAPA, Carquest, and O Reilly's around here.

12-16-2005, 05:04 PM	#6
stueber68 1968 C20 Vortec Beast Join Date: Jun 2005 Location: STILLWATER,OKLAHOMA Posts: 483	Re: Swithed to a hotter t-stat, now.. The computer controls fuel mixtures by reading engine temprature. The factory is a 195. Now, if a hypertech chip is installed in the ECM it requires a 180. __________________ Ugly or not it still kicks a**!



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