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Sluggish acceleration?

This is a discussion on Sluggish acceleration? within the General Help forums, part of the LSx Technical Help Section category; I noticed yesterday my car is having trouble accelerating when I get on it. It wasn't nearly this bad before. ...

  1. #1
    Member onetroubledguy's Avatar
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    Sluggish acceleration?

    I noticed yesterday my car is having trouble accelerating when I get on it. It wasn't nearly this bad before. It feels really delayed and not responsive at all, like she needs to take a breath before going.

    What could be the culprit? I definitely need to add some oil - it's quite low. Also I have a clear lid right now and can see a lot of gunk in the MAF screen. Other than that not sure.
    Last edited by onetroubledguy; 03-07-2009 at 11:59 AM.

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    Clean your Air Filter, MAF and TB.

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    Veteran Hi-Po's Avatar
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    Ummm, if your quite low on oil... I highly suggest you stop doing that and put some oil in.

    Miles? Last plug change?

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    Sounds like you have a clogged/dirty fuel filter.

    Mine was doing the same thing about a month ago. I thought it was my fuel pump going out so I took it to my mechanic. He suggested I change the fuel filter and that I might get lucky and that be the problem instead of my fuel pump going out.

    I bought and had a new fuel filter put on and havent had any problems since.

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    Member egod's Avatar
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    Quote Originally Posted by onetroubledguy View Post
    Also I have a clear lid right now and can see a lot of gunk in the MAF screen. Other than that not sure.
    sounds like you answered your own question. All those sound like good suggestions. When mine was really sluggish i thought it was the clutch slipping but it turned out to be a loose spark plug wire. You can check and make sure with your hand or with the car running squirt down by the plugs with a water bottle and look for fireworks.

    Being low on oil however, would technically free up horsepower by providing less resistance on the crank. So it wouldn't cause your problem, some racers actually keep it a quart or two low.

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    Member onetroubledguy's Avatar
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    Thanks guys. I'm going to start with the cleaning the MAF screen, but might as well do filters/liquids/wires/plugs/hoses/etc while I'm at it. It's time for that.

    Quote Originally Posted by Hi-Po View Post
    Ummm, if your quite low on oil... I highly suggest you stop doing that and put some oil in.

    Miles? Last plug change?
    That's the thing...I'm religious about checking the oil and getting it changed. I don't know why it is so low. My oil change was maybe 2 months ago.

    Approaching 100k miles so I'm sure it needs some maintenance.
    Last edited by onetroubledguy; 03-07-2009 at 06:51 PM.

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    Take the screen off...

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    Member onetroubledguy's Avatar
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    Quote Originally Posted by ls1camino View Post
    Take the screen off...
    Just to check...good idea.

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    Member egod's Avatar
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    screen is there for a reason

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    Member onetroubledguy's Avatar
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    Quote Originally Posted by egod View Post
    screen is there for a reason
    I think he meant remove it temporarily to see if it's still having problems, although I do know people that left theirs off permanently.

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    Screen out of the maf?

    Stop doing this people. The screen is there for a reason. Stop changing MAF's. Stockers is good to 500+RWHP. Its not a restriction. Aftermarket MAFS show no gain, usually just a load of other problems.

    Check your oil every other fuel up. 1 QT low at 6500 rpm is an excellant way to spin a bearing a ruin your shortblock. Use good oil, not what the oil change place "suggests".

    Change those things and see if it helps.
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    Quote Originally Posted by egod View Post
    screen is there for a reason
    Then why bother with an Air Filter?

    Quote Originally Posted by onetroubledguy View Post
    I think he meant remove it temporarily to see if it's still having problems, although I do know people that left theirs off permanently.
    I have mine out and I've never had a problem.

    Quote Originally Posted by Hi-Po View Post
    Screen out of the maf?

    Stop doing this people. The screen is there for a reason. Stop changing MAF's. Stockers is good to 500+RWHP. Its not a restriction. Aftermarket MAFS show no gain, usually just a load of other problems.

    Check your oil every other fuel up. 1 QT low at 6500 rpm is an excellant way to spin a bearing a ruin your shortblock. Use good oil, not what the oil change place "suggests".

    Change those things and see if it helps.
    Basic Fluid Dynamics...it IS a restriction. A fluid system is only as effective as its smallest part. So when you're running a stock MAF (78mm diameter) with your 90mm Intake/TB, you're not getting the full potential out of your induction system.

    Note: I advocate getting rid of the MAF altogether and running Speed Density.

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    Member onetroubledguy's Avatar
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    Actually my oil wasn't as low as I thought, so that's good. And this car has only had mobil 1 synthetic in it.

    I looked at the screen again and it is really clogged. I think that's the problem. I will clean it tomorrow when I install my lid.
    Last edited by onetroubledguy; 03-07-2009 at 09:23 PM.

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    Member egod's Avatar
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    camino is right, f*ck the air filter, as long as your running your maf screen.

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    I would highly suggest keeping the screen as well or waiting till you have a tune. It does change the maf tables from what I have read from the tuners on here.

    its always a heated discussion.

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    Quote Originally Posted by egod View Post
    camino is right, f*ck the air filter, as long as your running your maf screen.
    Not what I meant.

    You have an Air Filter there for a reason, so why have a screen on the MAF? Nothing should be getting by your filter anyway.

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    Dude, the screen on the MAF is not used as a secondary filter for the air. When I learn more about doing SD I will surely go with it. I have HPtuner Pro, but I need to learn alittle more about tuning VE tables. Sure, the stock MAF on a 400 ci+ engine is somewhat a restriction... but unless you tune for a aftermarket MAF, I gurantee it changes your tune(for the worse).
    Last edited by Hi-Po; 03-08-2009 at 08:55 AM.

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    Quote Originally Posted by ls1camino View Post
    Not what I meant.

    You have an Air Filter there for a reason, so why have a screen on the MAF? Nothing should be getting by your filter anyway.
    i was being sarcastic i know what you mean, but you know the stories of people finding shit on their maf screen, i know i have. I just like the extra protection.

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    Quote Originally Posted by ls1camino View Post
    Not what I meant.

    You have an Air Filter there for a reason, so why have a screen on the MAF? Nothing should be getting by your filter anyway.

    You need to sell your car and buy a fucking moped. The maf screen is there to keep airflow in a direct path and not having it turbulating through the sensors. Taking it out may give you a "I think I feel the difference" thought, only because it leans out the comp, dumping more gas, but truly does nothing as a "performance" gain.

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    As stated a million times before. The screen is there for a reason(and its not for a secondary air filter!). Taking it out, and "porting" your MAF is worthless IMO. If you feel a power gain, its all in your head. I barely felt a power gain swapping from a shitty LS1 intake to a FAST 92 PTM 92 on a CNC'd headed, full exhuast 6.0 . Leave the damn MAF alone.

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