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engine got wet, rough @ low rpm ?

This is a discussion on engine got wet, rough @ low rpm ? within the External Engine forums, part of the LSx Technical Help Section category; after a heavy rain last week and run through some deep pudddles I'm running rough at low rpm. It clears ...

  1. #1
    Junior Member
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    Black
    1999 WS6 Conv.

    engine got wet, rough @ low rpm ?

    after a heavy rain last week and run through some deep pudddles I'm running rough at low rpm. It clears out when get over 2K rpm. It is worse with the a/c running. When it first started it would run rough if I left the pedal in the same position say at 2200 rpm then goose it to clear it out. Comes and goes. Clear at WOTor heavy acceleration.
    If we had a rotor & cap thats were I would look... it feels just like that. Any advice ?
    ________________________________________
    99 WS6, Black Vert M6
    Lid, K&N, PPTB, PRC 2.5 heads, Comp Cam 228/.588 112 lsa w/ suporting mods, 96mmNW TB,102mmFast, Pacesetter LT's, ORY, Magnaflow, Tune, 4:10's, Aurburn Posi, LS7 Clutch, B&M shifter, Stano/ Koni , 18" C6 rims, 295/30 Kumho tires.

  2. #2
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    funny thing. my white car does that as well. while using my hptuners i found my right front o2 sensor was pegging completely rich. water is getting into the connector and shorting it out. when the o2 sensor pegs full rich, the PCM pulls all the fuel for that bank. this causes it to run rough until the fuel trims reset.

    i would start looking at the connections.
    Last edited by mrr23; 06-09-2009 at 09:00 PM.

  3. #3
    COTM July '09
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    BLK/BLK w/CGM Stripes
    2010 Camaro 2SS/M6

    I had my 02 sensors start acting up when I went through a deep puddle once and it did the same thing

  4. #4
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    dark blue
    2000 pontiac trans am ws6

    i did the free ram air mod....during heave rain, big ass puddles...my air filter got wet and it choked the crap out of engine...running rough, random miss fires...but just for that day though

  5. #5
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Had the same issue. Changed plugs/wires/ cleaned the coilpacks/connections and it went away...

    Still need to grease/clean/replace the 02s

  6. #6
    Junior Member
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    1999 WS6 Conv.

    Thanks, I think that will do the trick.

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