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  • washed off engine, idles like crap and threw a code

    i washed off my engine, which ive done a couple times before and its never thrown a code, i thought it was my IAC again because the rpms would go up to 2 grand when in nutral and park, it sounds and feels like it has a missfire when in park and idleing at light but when driving it sounds normal then after i drove it again the check engine light came on so i hooked up the scanner and it said throttle position sensor, so i opened up the hood and let it sit outside all day almost (90 degrees out) and went and started it again and it was doing the same thing, so i left the hood open went to dinner, car show, and then to get some ice cream and came back and started it up and the check engine light was off but it still has a missfire, and it still idles between 700rpm and 2000rpm like it did when the IAC was bad, any suggestions?

  • #2
    i have no idea, but that definitely would have been easier to read with some punctuation marks :-)

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    • #3
      Sounds like you got some water where it wasn't supposed to go. Might have gotten some dirt or something in your IAC's plunger.

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      • #4
        sorry tucking thats your public schooling for ya, and cleaned the IAC, its still acting up, im thinking the missfire could be from water in the dist cap?
        Last edited by playinmud; 07-08-2007, 12:28 AM.

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        • #5
          Pull the cap and rotor and spray it out w/wd40. Heck, might be a good time to just change them out anyways. Hope that works.

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          • #6
            Had the EXACT same problem as you a couple of months ago. Washed the engine, got the check engine light, then idled like crap between 700-2000 rpms and missed alot under acceleration.

            It WAS the throttle positioning sensor. I replaced it and the check engine light went off and idled normally again. Be carful though, I had to break some of the plastic to get it off and stripped some stuff because of corrosion. I also found that the rubber seal that was supposed to be there on the sensor was totally missing.

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            • #7
              Originally posted by Jeepis
              Pull the cap and rotor and spray it out w/wd40. Heck, might be a good time to just change them out anyways. Hope that works.
              complete tune up in december when i bought it because the previous owner said he had no clue when the last time it was done,


              jwa1r2t3, how much did you pay for one? i only asked one parts store but they wanted $60, the guy i talked to was like "oh **** thats an expensive sensor"

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              • #8
                Wouldn't hurt to check whether moisture got in there anyway. New or old, a wet distributor cap is a wet distributor cap.

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                • #9
                  jeepis it was dry, is the throttle position sensor also causing it to missfire? the check engine light is off but the idle still jumps up and down and it missfires every once in a while

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                  • #10
                    Ok, hmm, probably a sensor then. Do you think the water pressure caused a plug wire to come slightly loose? I'm out of ideas.

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                    • #11
                      checked all that when i took off the dist cap to check for water i guess tomorrow ill buy a throttle position sensor and hope it fixes it

                      i dont get why it never threw a missfire code though
                      Last edited by playinmud; 07-08-2007, 10:29 PM.

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                      • #12
                        Mine does that even if I friggin mist it! I drive through it for a day and it usually goes away after that. Wherever that water is going dries off after it gets hot once or twice.

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                        • #13
                          i drove it for a good 15 mins after i washed it off and then i brought it back and washed the outside and then when i went to go move it again it started acting up

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                          • #14
                            Keep us posted on what the problem actually was. Good luck.

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                            • #15
                              Check your MAP - manifold air pressure sensor (think it's on the firewall over the valve cover - maybe???) not supposed to get it wet. I cover mine when I wash down the motor. If it's like mine the harness that plugs into it will be green and there is also a vacuum line from the manifold to it.

                              GOOD LUCK!

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