Thread: Thermostat stuck affecting gas mileage?

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  1. #1 Thermostat stuck affecting gas mileage? 
    cbehrenwald1988
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    Default 05-14-2013
    I just bought a 2004 Grand Prix and noticed I'm not getting very good gas mileage (18 mpg driving @ 65 mph). The check engine light came on a couple times briefly so I took it to autozone. The reading came up that my thermostat was stuck open and overcooling my engine. I was wondering if the engine being over cooled would affect my fuel economy due to the engine not getting up to temp to properly burn gas. Anybody else have a similar problem or input?
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  2. #2 Re: Thermostat stuck affecting gas mileage? 
    Scottydoggs
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    Default 05-14-2013
    sure would, change the t stat, its 10 bucks. get a 195 deg one. it may come with a new o ring, if not buy one as well.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Thermostat stuck affecting gas mileage? 
    dsmuts
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    Default 05-14-2013
    Yep run a 180* if you plan on modding a lot.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
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  4. #4 Re: Thermostat stuck affecting gas mileage? 
    SlowNA06
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    Default 05-14-2013
    Quote Originally Posted by dsmuts View Post
    Yep run a 180* if you plan on modding a lot.
    Or don't. And honestly, for $10 and 10 minutes of your time, it's a bridge to be crossed when necessary.
    Irridium spark plugs last 100k mi and work just as well as copper. Copper is a waste on N/A and only lasts 15k mi. Don't use Platinum.
    Use 195* tstat unless you can thoroughly explain why not; 99.9% don't need a lower temp.
    Almost any oil filter, ever, is of higher quality than ACDelco. Spend $6+.
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  5. #5 Re: Thermostat stuck affecting gas mileage? 
    dsmuts
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    Default 05-15-2013
    I just like my engine to run cooler so I always run a 180* but it's more personal preference than anything.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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