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everythings cool til i floor it

This is a discussion on everythings cool til i floor it within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by Cutlass it might be that SLP MAF Lean on both banks could be a MAF problem, low ...

  1. #21
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    Quote Originally Posted by Cutlass View Post
    it might be that SLP MAF
    Lean on both banks could be a MAF problem, low fuel pressure, or vacuum leak.
    pretty certain its not a vacuum leak and these codes were coming up before the maf but i have my original might change it back and still need to check my fuel pressure

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    Quote Originally Posted by heath26 View Post
    pretty certain its not a vacuum leak and these codes were coming up before the maf but i have my original might change it back and still need to check my fuel pressure
    both banks sounds like a)vacuum leak or b) that SLP MAF to me.

    Have you cleaned the MAF recently? If it's dirty it may not be reading properly causing the computer to retard the fuel causing your lean condition.

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    Senior Member Too Fast's Avatar
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    I'm thinking about the SLP MAF also. Do you have your old one? Or one you can borrow? Is it clean?

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    Quote Originally Posted by 35th-ANV-SS View Post
    both banks sounds like a)vacuum leak or b) that SLP MAF to me.

    Have you cleaned the MAF recently? If it's dirty it may not be reading properly causing the computer to retard the fuel causing your lean condition.
    as far as the vacuum leak i used half a can of carb cleaner srayed the hose off tb and pcv hose the tube between maf and tb and my intake gasket and found nothing and i cleaned the maf and tb with maf cleaner could it be a fuel filter issue?

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    Quote Originally Posted by heath26 View Post
    as far as the vacuum leak i used half a can of carb cleaner srayed the hose off tb and pcv hose the tube between maf and tb and my intake gasket and found nothing and i cleaned the maf and tb with maf cleaner could it be a fuel filter issue?
    I didn't go back and read the entire thread, but if you have a pressure gage you could check the fuel pressure at the rail. It should read 58 PSI.

    A fuel filter wouldn't be a bad maintenance item to replace anyway if you've never changed it. Pretty cheap and inexpensive and would rule that out.

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    Quote Originally Posted by 35th-ANV-SS View Post
    I didn't go back and read the entire thread, but if you have a pressure gage you could check the fuel pressure at the rail. It should read 58 PSI.

    A fuel filter wouldn't be a bad maintenance item to replace anyway if you've never changed it. Pretty cheap and inexpensive and would rule that out.
    no pressure gauge but fuel filter doesnt fix it gonna try old maf and if that does nothing then pressure gauge is next

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    Yeah I agree. Try the easiest, cheapest things first Keep us posted.

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    well i changed the fuel filter and it was so plugged i couldnt blow at all through it. that made my o2 sensors stop going off but the lean codes were still popping so i went back to my origanal maf and 100 miles later no codes so far

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    Glad to see you're up and running better!

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    Quote Originally Posted by heath26 View Post
    well i changed the fuel filter and it was so plugged i couldnt blow at all through it. that made my o2 sensors stop going off but the lean codes were still popping so i went back to my origanal maf and 100 miles later no codes so far
    Would it have thrown the codes by now? What are the fuel trim numbers now?

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    Quote Originally Posted by Too Fast View Post
    Would it have thrown the codes by now? What are the fuel trim numbers now?
    lt ft is running about 5 to 10% it was at 25%

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    Senior Member Too Fast's Avatar
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    ^^^Then it's fixed for sure. LT trims should be less than +/- 10%, with less than 5% ideal, as you probably know by now. Another case of an aftermarket MAF not working right with the LS1.

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    Quote Originally Posted by Too Fast View Post
    ^^^Then it's fixed for sure. LT trims should be less than +/- 10%, with less than 5% ideal, as you probably know by now. Another case of an aftermarket MAF not working right with the LS1.
    yes i did'nt want to believe it but its true at idle ft is 0 to -.8 and driving 70 they are about 8 or so. can a tune shop turn my fuel up to compensate for the aftermarket maf or did i just waste my money?

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    I don't know that answer, I think it's a yes. You could ask Frost, he's the respected LS1 tuner/sponser of this site. However, my guess is you wasted your $$$, shoulda checked with the mostly knowledgeable people here first LOL. That's the reason I joined this site in 11/06, I was asking about headers, specifically SLP, and a lot of people steered me away from that. I've really heard that the MAFs are a waste of money unless your over ~450 HP, and then most people will say to go with a speed/density tune.

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    o well i've wasted more money on girls than that maf will ever come close to lol

  16. #36
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    Good to hear you're on the road again.

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    Quote Originally Posted by heath26 View Post
    can a tune shop turn my fuel up to compensate for the aftermarket maf or did i just waste my money?
    yes there is a MAF calibration that can be adjusted so the MAF sensor output matches the what the computer needs to see.

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    Senior Member Too Fast's Avatar
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    ^^^Yes but why? I see no advantage to fixing your PCM's tune to match a bad output from a incorrectly reading MAF. Just keep the stock MAF, and spend that $$$ elsewhere.

  19. #39
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    ^^^ I agree. just wanted him to know its possible.

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    thanks everyone for all the help and info

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