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Gas Cap/Vapor Canister and Gas Mileage

This is a discussion on Gas Cap/Vapor Canister and Gas Mileage within the General Help forums, part of the LSx Technical Help Section category; Yeah, at IATs above low freezing, our cars (LS1s) will go into closed loop at 92degF if everything is ok....

  1. #21
    TunedbyFrost.com Tuner Frost's Avatar
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    Yeah, at IATs above low freezing, our cars (LS1s) will go into closed loop at 92degF if everything is ok.

  2. #22
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    The thermo gauge stays at just below 160 while driving. Like 150 or so.

  3. #23
    Senior Member Too Fast's Avatar
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    Do you have hot heat, or is it just warm? If it is just warm, suspect your thermostat if you have no leaks. Our t-stats are 185? I don't know what our stock 'stat is. 185 or 190 or so, not 160.

  4. #24
    Member 180ls1's Avatar
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    Hey FROST thanks for the replies.
    I am not trying to hyjack a thread but i got 2 o2 sims from the previous owner could i use the o2 sims on my front o2's? Because i have a nearly stock 1999 m6 camaro with 94K on the clock and i cant break 20mpg (quite a bit of highway driving) and i just seafoamed it. I am going to do plugs, plug wires and maybe the front o2's sound good?

  5. #25
    TunedbyFrost.com Tuner Frost's Avatar
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    you ABSOLUTELY CANNOT run sims on the front O2s. The front O2s are always the first culprit in line for bad mileage.

  6. #26
    Member 180ls1's Avatar
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    Quote Originally Posted by Frost View Post
    you ABSOLUTELY CANNOT run sims on the front O2s. The front O2s are always the first culprit in line for bad mileage.
    what o2 sensors do you recomend for a daily driver? i am not going to do anything crazy with my car at least for a while. Any sponsor that will have the best deal? Thanks
    1998 Firebird Formula WS6... few things done.

  7. #27
    TunedbyFrost.com Tuner Frost's Avatar
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    stock replacements

  8. #28
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    If you water temp sensor is messed up it will not throw a code but the guage will read low. The one on my 98 messed up and was telling the cpu it was like 35 degrees outside in the 90+ degree summer heat. And it was running very rich. It wasn't even $20.00 at the GM dealership and ran a whole lot better after replacing it. The mechanic picked it up on a Tech 2 handheld.
    TSP 347 SB, TSP Stage 2.5 PRC LS6, TSP MS4, Performabuilt Stage 2 4L60E, Yank PT4000, 4.11s, Fast 90/90, FTRA Cold air intake+all the free mods, Dynatech Supermaxx Exaust System, DMH Cutouts, Hooker Catback/FTRA Tips. Tuned by RPM/Garner NC. 11.28@119

  9. #29
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    Quote Originally Posted by Banshee1967 View Post
    The thermo gauge stays at just below 160 while driving. Like 150 or so.

    I am an idiot..I meant to say just below 185..

  10. #30
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    Quote Originally Posted by 180ls1 View Post
    what o2 sensors do you recomend for a daily driver? i am not going to do anything crazy with my car at least for a while. Any sponsor that will have the best deal? Thanks
    I have a pair of brand new GM Delco O2's I picked up a few days ago. I got them through a friend who works for GM and got them for employee pricing. They are the correct harness lengths and part numbers. I was committed to buying them but had not picked them up yet. When I removed the old O2, the bunghole stripped and had to have a new one welded in and picked up a pair of Bosch's across the street cause I didn't want to damage anything.

    Let me know if you, or anyone wants them

    Tom

  11. #31
    Senior Member Too Fast's Avatar
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    Quote Originally Posted by Banshee1967 View Post
    I am an idiot..I meant to say just below 185..
    Well, that sounds normal. That falls within our "accurate" gauges. Still would be nice to see what the PCM is actually seeing, tho. And to check what the other sensors are reporting to it also.

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    Update...

    Replaced both O2's with Bosch, properly filled up the tank. Where I was at 1/2 tank last week with 100 miles, I am now at 208, 54 city miles remainder freeway.

    I have not changed the charcoal canister yet..But is next after a few tanks.

    Will post the final mileage in a few days.

  13. #33
    Senior Member Too Fast's Avatar
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    Sounds like you found the problem, ie, skewed O2 sensors.

  14. #34
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    did you need a special tool to remove the hose that connects to the Canister Purge Solenoid?

  15. #35
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    It's been a while since the last post.

    Did the canister replacement work???

    I've been reading and have the same issues, I changed both front O2's but no improvement on gas mileage either. I also did a tune up and nothing changed. Guess that at 158xxx miles there's a lot more to do.

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