Thread: Thermostat Questions

Too cold of thermostat will not cause a misfire. Keep looking for other causes, plugs, wires, etc.

What car are we talking about? If your 98 GP was running on 7 cylinders, it's definitely not stock.

Originally Posted by Scimmia

Too cold of thermostat will not cause a misfire. Keep looking for other causes, plugs, wires, etc.

What car are we talking about? If your 98 GP was running on 7 cylinders, it's definitely not stock.

Sounds like a force of habit nascar term, unless he's driving a nascar spec grand prix.

Misfires don't easily go away and can do more harm down the line. Since you have the scanner it tells you which cylinder and from there check the plugs and wires, possibly fuel injector if the first two checks didn't fix it. If it's only one cylinder misfiring then you don't have a coil problem.

Originally Posted by mycutlassblue

We had it hooked up to the scanner after my check engine light was on for a miss.. I ran for about 4 miles on 7 cylinders then the car warmed up and it stopped. So we hooked the scanner up to it to see which cylinder it was. The scanner said my car was at 80* Celsius (I googled it) and thats 176* Fahrenheit. So I would say that I do have a 180* thermostat. Guess based on the comments I have been reading on here I will go with a 195* thermostat when I replace all of my hoses. Anything is better than the 10 mpg I am getting right now.

Couple things, you only ran the car for 4 miles. How do you know it was completely warmed up? If you have the scanner on it, you should be able to watch the coolant temp rise from cold and heat up. When the t-stat opens, the temp will start to drop. You t-stat temp is going to be very close to where the coolant temp stopped rising and started dropping.

FWIW, if you are worried about it, a t-stat is $8 and takes all of 5 minutes to change.

Stupid question, but where is the T-stat located please and thank you

Originally Posted by mycutlassblue

ok I don't know why all of a sudden everyone is jumping into the whole hating thing. I had a bad plug wire. That problem was fixed before I even posted this thread I was just stating that we had it hooked up to a scanner in response to the first response I got on this thread. I drove the car 8 miles. The car was very well heated up. The car was on 7 cylinders for about 2-4 miles because of the bad plug wire. When the wire warmed up it would catch the contact. So thanks to everyone that answered about whether changing the thermostat would increase mpg and if it would change performance and not getting off topic and saying something like "if you are that worried about it a new thermostat only cost about 8 bucks and takes 5 minutes to replace."

The only reason I asked is because we are getting ready to do the intake gasket on it and I wanted to know. So I thought I would get the info about it before trying the higher temp thermostat that way I'm not replacing it for no APPARENT reason.

5 cylinders

Originally Posted by mycutlassblue

ok I don't know why all of a sudden everyone is jumping into the whole hating thing. I had a bad plug wire. That problem was fixed before I even posted this thread I was just stating that we had it hooked up to a scanner in response to the first response I got on this thread. I drove the car 8 miles. The car was very well heated up. The car was on 7 cylinders for about 2-4 miles because of the bad plug wire. When the wire warmed up it would catch the contact. So thanks to everyone that answered about whether changing the thermostat would increase mpg and if it would change performance and not getting off topic and saying something like "if you are that worried about it a new thermostat only cost about 8 bucks and takes 5 minutes to replace."

Wow, someone is a little sensitive. I didn't notice anyone jumping on you. And I, being the one who made the comment about changing the t-stat, was surely not hating. Just here to help you out, bud.

Originally Posted by mycutlassblue

Well I may be, but this thread was just about getting the info on whether I should keep it or use the 195 When we do the intake gasket tomorrow. I'm new to the SC V6 and just wanted to see who all had noticed a difference or not you know? Cause for me if something isn't broke I don't want to replace it unless it will help performance. This case seems to not hurt performance and increase my gas mileage hopefully. I can only fit about 12 gallons into my gas tank and the manual says the car has an 18 gallon tank. So I'm trying to get the most out of those 12 gallons.

I promise you it's bigger than 12 gallons.

I run mine to about 14.6 gallons before I really worry about filing up. The tank holds a couple more than that, as well...

The boost problem has nothing to do with the thermostat either. That's a problem with the bypass valve solenoid. Make sure it's all plugged in and has a vac line running to the bottom port on the bypass valve actuator.

There's still plenty of fuel left after E, if you run out you'll get 17 gallons but that's not good for the fuel pump. If it's sucking gas what mileage are you getting?