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Acceleration problem!!! o2 sensor?

This is a discussion on Acceleration problem!!! o2 sensor? within the General Help forums, part of the LSx Technical Help Section category; and there is no real way to check this unless I replace those hoses on the fuel pump? Ughh...lol. Im ...

  1. #41
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    and there is no real way to check this unless I replace those hoses on the fuel pump? Ughh...lol. Im removing the cat just to see if that does anything. a lot of people I've talked to about the issue have no idea where to begin with this problem haha





  2. #42
    Moderator 35th-ANV-SS's Avatar
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    My guess is you have a crack or pinhole in the accordion hose on the fuel pump you aren't seeing. Your fuel pressure should not drop like it did.

    I will also suggest you don't drive the car until this is resolved, unless you want to be replacing the motor as well. You are running lean (not enough fuel) and that will destroy an engine quickly.
    It's on jackstands.

  3. #43
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by SuperSSguy View Post
    Will running lean cause hi or low Nox levels? and other then a meter how would you know if your running lean?
    Your engine will have a loss of power in the upper RPMs since it's starving for more fuel. Also, multiple misfires due to not enough fuel.

  4. #44
    Senior Member JayTA98's Avatar
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    this is what I saw on my pressure gauge when I had a pinhole in my corrugated fuel line.

  5. #45
    Senior Member JayTA98's Avatar
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    and here was the pinhole leak.


  6. #46
    Member SuperSSguy's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    Your engine will have a loss of power in the upper RPMs since it's starving for more fuel. Also, multiple misfires due to not enough fuel.
    Humm...No loss of power in upper RPMs in fact it hauls ass passed 80+ MPH seems to love the air from the CAI and the LT`s in that higher RPM/MPH range though id like it to pull harder and faster (dont we all ) and NO no misfires at all.. Also i should have had it tuned when i put the cai and lt-headers on it. After tune (coming soon) its supposed to really haul ass...so we will see.I havent pulled a plug in a while and know thats a so so indicator of how your engines running but the tune will fix all that so no worries.I can feel that the engine has more in it,to me anyway ?. Thanks.
    Last edited by SuperSSguy; 07-06-2013 at 08:48 PM.

  7. #47
    Member herculesrider1's Avatar
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    Cool information...I have 170,000 miles on mine, and don't know if the MAF sensor has ever been cleaned. I will try that tomorrow...thanks, even though this thread is two years old!!!! I'
    m having the same acceleration issues as the original post, but with mine, when I depress to WOT, it runs great...mainly it's low rpm hesitation....

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