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help with studdering

This is a discussion on help with studdering within the Computer & Tuning forums, part of the LSx Technical Help Section category; When cruising at about 1500 rpms. My car bucks hard. The tune is 3 years old and used to be ...

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    Member RealLiveMD's Avatar
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    help with studdering

    When cruising at about 1500 rpms. My car bucks hard. The tune is 3 years old and used to be perfect. It is as if something is removing all the fuel for milliseconds at a time. My foot is on the throttle. The car goes ...then all fuel is lost for milliseconds then goes... then all fuel lost.. then goes. At WOT there is no problem. The o2 sensors have been changed and read well. the fuel filter is new. spark plugs new. battery cable new. battery new, connections checked. grounds checked. I thought it was an electrical problem because it seems that if I turn on my blinker after during the studder. It blinks slowly, then speeds up when everything sorts itself out. No codes are being thrown except my tps light is on( however this is recent and the problem is old). The dashboard does not go haywire as if the battery connection is gone, and the radio never skips a beat. Any suggestions

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    Impounded
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    My issue like this was caused by the TPS.. it eventually got worse and worse.

    Check your grounds.

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    Member RealLiveMD's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    My issue like this was caused by the TPS.. it eventually got worse and worse.

    Check your grounds.
    The grounds have been checked. Did your tps eventually make your car studder until it cut off? My Tps reads well on my microedge, I can observe all increments of .05

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    Quote Originally Posted by RealLiveMD View Post
    The grounds have been checked. Did your tps eventually make your car studder until it cut off? My Tps reads well on my microedge, I can observe all increments of .05
    Yeah it would die when the torque converter unlocked when i was slowing down.I think it caused a lot of issues.

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    Member RealLiveMD's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    Yeah it would die when the torque converter unlocked when i was slowing down.I think it caused a lot of issues.
    now I'm getting a MAP code. The shop doesn't seem to know why.

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    Member RealLiveMD's Avatar
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    changed the tps and maf. the car is still doing the same thing. Disregard the blinker. I fixed it. It was a dreaded bulb problem

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    Veteran 0rion's Avatar
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    what map code are you getting? Have you checked lines for a vacuum leak?

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    Quote Originally Posted by 0rion View Post
    what map code are you getting? Have you checked lines for a vacuum leak?
    got to check with tuner for exact code. I was under the impression that it was just one code for MAP. I took it to the shop to have everything looked over. Exactly which lines should i be checking. The tuner said that a vacuum leak wouldn't be so sporadic. I can potentially drive the car an hour without a problem then... jerk jerk jerk. I can power it through by stepping on the throttle to WOT.

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    That is the same thing my car is doin. still dont know what it is

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    threw a p0107 code. Can this be fuel pump?

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    Quote Originally Posted by RealLiveMD View Post
    threw a p0107 code. Can this be fuel pump?
    bad wire, connector, or sensor... (MAP of course). Has nothing to do with a fuel pump.

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    After months, and hundreds of dollars at different shops, I found a vacuum leak. There was a vacuum hose that ran pass my battery to the ac/heater vac tank. The acid corroded the hose. Problem fixed. The beast is back.

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    Quote Originally Posted by 0rion View Post
    what map code are you getting? Have you checked lines for a vacuum leak?
    Quote Originally Posted by RealLiveMD View Post
    After months, and hundreds of dollars at different shops, I found a vacuum leak. There was a vacuum hose that ran pass my battery to the ac/heater vac tank. The acid corroded the hose. Problem fixed. The beast is back.
    glad you got it fixed.

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    Quote Originally Posted by RealLiveMD View Post
    After months, and hundreds of dollars at different shops, I found a vacuum leak. There was a vacuum hose that ran pass my battery to the ac/heater vac tank. The acid corroded the hose. Problem fixed. The beast is back.
    Pic of this? I'm having similar prob. Changed PCV lines. Where is this other vacuum line?

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    runs from back of manifold down passenger firewall, snakes by battery bundled with a bunch of wires and connects to a tank sitting under the battery location.

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    Quote Originally Posted by RealLiveMD View Post
    runs from back of manifold down passenger firewall, snakes by battery bundled with a bunch of wires and connects to a tank sitting under the battery location.
    Thanks. I will check it!

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    Still no luck. I want to offer a $100 reward to whoever could tell me the problem so I can repair it and enjoy my car I can't wait to buy another car some days.

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    Veteran 0rion's Avatar
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    Quote Originally Posted by TedsB4Csled View Post
    Still no luck. I want to offer a $100 reward to whoever could tell me the problem so I can repair it and enjoy my car I can't wait to buy another car some days.
    did you change ALL the pcv hoses? Normally that pcv hose likes to crack on the backside of the hose right where it turns to go into the intake.

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    did you check the hoses that go to your AIR or used to go to your AIR?

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