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    #1

    Ongoing idle problem

    So I have searched around but have yet to come to a good conclusion. Here are the facts.

    -bought the car with the idle fixed and 1500 rpm's (did not pulse up and down at all)
    -Took it to a shop and they did some type of fuel injection cleaning and it began to pulse up and down in rpm's from about 750-1750
    -Checked out ICV and decided to clean it up some and reinstall. I searched and found out that the valve should actually pulse a little upon turning the key to the car to accs. It DID pulse (I could feel it vibrate).
    -Idle did not change
    -Shut car off and came back 30 minutes later and the car would idle at 3K now (was not pulsating)! Would not go back down after a few seconds. I am guessing that I should check the idle control screw on the throttle body next. Maybe the icv is working now but I just need to adjust the idle screw to compensate for the working valve?


    I am testing a ICV from a friends car tomm. but what else should I check? I believe I tested the icv wire correctly and it read 4 ohms. I tried to check the icv and the gauge went off the scale (btw any good volt meter reference guides to work with? I am a pretty big noob when it comes to this stuff).


    Any ideas on what else I should check out?
    Tags: None
    #2
    that screw isn't an "idle screw". it's a throttle stop. unless it's been messed with before, I'd leave it alone.

    it really sounds like your ICV is just toast.
    Build thread

    Bimmerlabs

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      #3
      It could be that the ICV is good, but someone has futzed with the throttle stop or the TPS could be misadjusted or bad. If you can feel the ICV buzzing with the ignition on there's a good chance that the ICV is ok, assuming it isn't sticking.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

      Comment

        #4
        Originally posted by jlevie View Post
        It could be that the ICV is good, but someone has futzed with the throttle stop or the TPS could be misadjusted or bad. If you can feel the ICV buzzing with the ignition on there's a good chance that the ICV is ok, assuming it isn't sticking.
        Thanks to the both of you above for your comments!!!!!

        Once I cleaned the valve you could actually feel the valve open and close with a little tap so I I dont think it would be more of a sticking issue. When I had my inspection done I do think they were messing with that screw. I was thinking about it today and I came to the conclusion that even if the idle was set really high with the valve not working I would have really noticed the 3k rpm because it was still trying to oscilate between 750 and however high the idle was set to maybe (just a random guess). So im thiking maybe the valve is fine now but all that has to be done is just play with that screw until a normal idle is met which should be pretty steady. I will try this tommorow when I get back to the car.

        As for the tps sensor, im going to have to check into this because I have never messed with one before.

        Thanks for the advice. I think its pretty obvious that I am pretty inexperienced when it comes to working on my own car but hopefully I can learn something from you all and help any others in the future with my own experiences. Thanks Again.

        Comment

          #5
          Update!!!!

          So I went to start my car today and it was bouncing from about 1500-2000 rpms. Got to the guys house to check out the icv he had and checked the ohms on it. It read about 10-11 ohms or something in that area. Upon putting it on the idle then only jumped from about 750-1200 rpms. We then started checking all the componets and on the tps sensor we noticed that it was COVERED it what apears to be years of slude. I take off the harness and notice that the inside has what I thought was oil or some old liquid on the inside. I cleaned it out as best as I could. We then proceeded to test the harness placing the possitive prong of the voltmeter on the center of the harness and placing the negative prong on one of the other 2 female parts of the harness and noticed no conductivity at all really. So we were thinking its probably the switch. Plugged the wire back into the sensor and now the car hovers around 2k at idle with really no bouncing of the rpms at all.

          Any ideas on next steps to take?

          Comment

            #6
            Ah yes the oil soaked TPS syndrome...

            As the engine gets some age on it oil vapors get pulled into the throttle body. Some of that oil will seep down the butterfly shaft and into the TPS. Eventually causing failure of the TPS. It would have been a better design to locate the TPS on top of the throttle body, but that's hindsight.

            When I replace one I drill a 1/8" hole directly below where the butterfly shaft goes. Then oil won't collect inside of the TPS.
            The car makes it possible, but the driver makes it happen.
            Jim Levie, Huntsville, AL

            Comment

              #7
              Originally posted by jlevie View Post
              Ah yes the oil soaked TPS syndrome...

              As the engine gets some age on it oil vapors get pulled into the throttle body. Some of that oil will seep down the butterfly shaft and into the TPS. Eventually causing failure of the TPS. It would have been a better design to locate the TPS on top of the throttle body, but that's hindsight.

              When I replace one I drill a 1/8" hole directly below where the butterfly shaft goes. Then oil won't collect inside of the TPS.
              Ahh, never heard of this.

              If there was liquid in there would you guess a tps failure then?

              I will look into drilling that hole. Thanks!

              Comment

                #8
                have you checked your oxygen sensor? it could just be a bad 02 sensor and thats an easy fix

                Comment

                  #9
                  Originally posted by klayvon View Post
                  have you checked your oxygen sensor? it could just be a bad 02 sensor and thats an easy fix
                  See, that was my first idea I had since the whole idle issue came about after my car was shooting out someawful stuff when they were cleaning out my fuel injectors. Only problem with this is that there is no longer a wobbly idle ever since I wiper off the tps sensor. Now its just high idle again unless that too could lead to a high steady idle.

                  How would you go about checking one just in case?

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