Thread: Car getting horrible MPG

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  1. #1 Re: Car getting horrible MPG 
    SE Level Member BANDIT's Avatar
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    The SeaFoam is like 13 bucks a can here in Canada, worst you can do is put it in and it cleans up your fuel system, but look at the butterfly in the plenum, that's where most of the build up was, on mine anyway.
    Good luck.
    04 GP GT Bone stock, just like me! 09 G8 GT...oh yeh!!!
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  2. #2 Re: Car getting horrible MPG 
    SE Level Member Mercenary's Avatar
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    Dunno just going by codes and what they say to check. What do you mean by ICM?
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  3. #3 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    If your coolant temp sensor is reading low the computer will dump a lot of fuel in thinking it is cold.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  4. #4 Re: Car getting horrible MPG 
    SE Level Member Mercenary's Avatar
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    Quote Originally Posted by 01GTP View Post
    If your coolant temp sensor is reading low the computer will dump a lot of fuel in thinking it is cold.
    So how do I check that/fix it?
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  5. #5 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    Do you have a multi meter?
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  6. #6 Re: Car getting horrible MPG 
    SE Level Member Mercenary's Avatar
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    not nearby.
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  7. #7 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    The only way I know how to check it is to measure the resistance at certain temps the resistance will drop the hotter the sensor is.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  8. #8 Re: Car getting horrible MPG 
    SE Level Member Mercenary's Avatar
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    Would it be worth it just to replace the sensor?
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  9. #9 Re: Car getting horrible MPG 
    Donating Users Mikey's Avatar
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    Quote Originally Posted by Mercenary View Post
    Would it be worth it just to replace the sensor?

    Change it. I did and my similar problem went away!

    Change the cat too.
    Last edited by Mikey; 04-07-2010 at 10:22 AM.
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  10. #10 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    Take it out and take it to auto zone they can check it with an ohm meter.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  11. #11 Re: Car getting horrible MPG 
    SE Level Member Mercenary's Avatar
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    Cool, I'll try that. Can I drive the car without it? Do I just need a simple ratchet and socket to get it out?
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  12. #12 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    No you could not drive the car with it out, It goes into a water jacket and when you pull it out you will lose some coolant. I it is in the LIM below the throttle body, I have my LIM off right now so I can go check and see how it comes off.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  13. #13 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    You unplug the wire going into it, then you need either a deep 3/4" socket or wrench to get it out. You will just need to see what will work.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  14. #14 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    I would try replacing your t-stat first, it may be stuck open. They are only like $6 vs. $40 for the sensor.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  15. #15 Re: Car getting horrible MPG 
    SE Level Member Mercenary's Avatar
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    Yea I already have 180 T stat just have to put it in. Kinda my first time workin on a car since high school so I'm a lil rusty with where everything is.
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  16. #16 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    If you have the plastic engine cover on take it off. The upper radiator hose goes into the t-stat housing. It has two 10mm holding it down. No gasket on it just the rubber o-ring. It is in the bottom right of the LIM as you are looking at it from the front. Then disconnect your batter for 15 min or so to reset the codes to see if it comes back.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  17. #17 Re: Car getting horrible MPG 
    SE Level Member Mercenary's Avatar
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    ok will do, I'll let ya know what happens
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  18. #18 Re: Car getting horrible MPG 
    SE Level Member BANDIT's Avatar
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    Hey guys, just signed up. My ABS service/Traction Control light came on, so thought I'd look around. Not that I'm asking here, I'll go look around later, but the gas mileage thread caught my eye, so here's my two cents.
    Anyway, just got my 04 GT2 a couple of months ago and had the same issues plus hard starting and stalling. So, I put a can of SeaFoam in a new tank of gas, took off the air tunnel between the air filter and intake, it was black and sticking. Cleaned it up, and then sprayed some top end cleaner in let it sit for about 5 minutes then put it back together and started it up. Purred like a kitten. Just for the hell of it, the next day disconnected the vacuum line from the air tunnel and set up a syphon hose so that when started the 1/3 can of Sea Foam in a container got sucked into the intake.
    Now, a couple of months later it still runs great. Just came back from a weekend at the races, filled up the car with 62.5 litres of gas, reset the odometer and drove fairly sensibly 115-125 km/hr on the highway. total distance 840 km on a tank, which when converted to MPG = 36mpg Canadian and about 32 MPG U.S.
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  19. #19 Re: Car getting horrible MPG 
    The mod from over yonder TheOtherNick's Avatar
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    He has a coolant temp problem that is causing his bad mileage, but yes seafoam works good for cleaning out the engine.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  20. #20 Re: Car getting horrible MPG 
    SE Level Member Mercenary's Avatar
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    ok, I finally got some free time to replace the T stat and unplugged the battery. I just got done a lil while ago so I don't know if it fixed my problem or not.
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