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Leanin out in cylinder 7 & 8

This is a discussion on Leanin out in cylinder 7 & 8 within the GM Trucks forums, part of the Vehicle Specific category; Ok, GM has a serious issue...The last two cylinders are leanin out, messin up my sparkplugs... Are there any solutions ...

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    Need Sand ??? Naf's Avatar
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    Question Leanin out in cylinder 7 & 8

    Ok, GM has a serious issue...The last two cylinders are leanin out, messin up my sparkplugs...

    Are there any solutions to this?

    Could i just put in injectors that are slightly larger? IE if there are 26# injectors, i put 27# or 28# on just the last two...

    thank you for you're time

    Naf

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    Quote Originally Posted by Naf View Post
    Ok, GM has a serious issue...The last two cylinders are leanin out, messin up my sparkplugs...

    Are there any solutions to this?

    Could i just put in injectors that are slightly larger? IE if there are 26# injectors, i put 27# or 28# on just the last two...

    thank you for you're time

    Naf
    Latest news, there was some dirt in the fuel rail, however, not enough to cause the leanin...

    Anyone have answer to my question though???

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    Ok,

    I got tiresome of waitin, i went into my tune and increased the VE by 4% and the MAF by 2.5%...So far no issues, but i am going to keep an eye on it...

    I will be installin Bosch +2 and Morosso's new 9.75" wire set for the trucks once i get them..And at a later date the MSD coils i once had on...

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    Quote Originally Posted by Naf View Post
    Ok,

    I got tiresome of waitin, i went into my tune and increased the VE by 4% and the MAF by 2.5%...So far no issues, but i am going to keep an eye on it...

    I will be installin Bosch +2 and Morosso's new 9.75" wire set for the trucks once i get them..And at a later date the MSD coils i once had on...
    I would have the injectors flow tested. You should not be having cylinders leaning out on a stock motor. Sand as you know will screw up injectors easily.
    Fuel filter, pump sock may need to be replaced and the tank might need to be flushed out.

    Hope it helps.

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    If i have sand in the fuel rails, i have more problems to look for...

    As it is, i am loggin my current tune and making small adjustments to the VE and MAF...Hopefully i will conquer this lean issue... We shall see

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