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Thread: Urgent help needed

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    Snowboard Man Club Member cainhead's Avatar
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    Urgent help needed

    Hello,

    Just on my way to visit my sister in hospital when I noticed the car seemed to be over revving. It wasn't too apparent until i pulled up to some lights and the car was revving to about 2500 on its own. I check the pedal wasn't stuck and it was fine. I managed to get the car to the hospital. The AFR shows 10 whilst its revving as I guess the extra throttle is making it inject more fuel. I disconnected the battery just to see if the ECU (AEM V2) was having a funny five minutes but when tried to start it again it nearly fired but didnt until i pushed down a little on the gas pedal. I cant see anything in the engine like a disconnected pipe or anything but have noticed a very slight coolant drip from the main pipe right behind and just about the block.

    Could it be the idle control? Im pretty stuck as I cant leave the car here and i live about 7 miles away.

    Any ideas very much appreciated.

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    Me? Post? Never! Club Member
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    I'd start with the Throttle Position Sensor. The link gives a procedure with screwdriver, ohm meter and feeler gauges to test it out. Here is an easy to follow video to check the feed and variable signal voltage from the TPS.
    Last edited by rider; 12-04-19 at 16:26.

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    Snowboard Man Club Member cainhead's Avatar
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    Quote Originally Posted by rider View Post
    I'd start with the Throttle Position Sensor. The link gives a procedure with screwdriver, ohm meter and feeler gauges to test it out. Here is an easy to follow video to check the feed and variable signal voltage from the TPS.
    thanks for the link, thats a good start. Just a thought, is it common for this to just change mid drive?

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    Snowboard Man Club Member cainhead's Avatar
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    Just got the car home. Had a little look around and the throttle body and the the throttle stop lever (circled in picture) seems to have a lot of play. It spins and doesn't seem secure. I take it the throttle stop screw touches the lever pushing it down slightly when throttle is closed.

    I'll do the multi metre check in a second.
    Attached Images Attached Images

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    Do Luck owning Club Member Swampy442's Avatar
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    You'd expect if it was holding revs at 2500 the AFRs would be at 14 odd, not 10, 10 is max boost full throttle stuff. Id say thats a start point
    I would gladly pay you £10 to never log onto this forum again, and I am serious. Scott M

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    Snowboard Man Club Member cainhead's Avatar
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    Quote Originally Posted by cainhead View Post
    Just got the car home. Had a little look around and the throttle body and the the throttle stop lever (circled in picture) seems to have a lot of play. It spins and doesn't seem secure. I take it the throttle stop screw touches the lever pushing it down slightly when throttle is closed.

    I'll do the multi metre check in a second.
    Quote Originally Posted by Swampy442 View Post
    You'd expect if it was holding revs at 2500 the AFRs would be at 14 odd, not 10, 10 is max boost full throttle stuff. Id say thats a start point
    Sorry I don't follow. Are you saying the AFR is reading wrong therefore sending the wrong signal to the ECU.

    - - - Updated - - -

    Quote Originally Posted by cainhead View Post
    Just got the car home. Had a little look around and the throttle body and the the throttle stop lever (circled in picture) seems to have a lot of play. It spins and doesn't seem secure. I take it the throttle stop screw touches the lever pushing it down slightly when throttle is closed.

    I'll do the multi metre check in a second.
    Quote Originally Posted by Swampy442 View Post
    You'd expect if it was holding revs at 2500 the AFRs would be at 14 odd, not 10, 10 is max boost full throttle stuff. Id say thats a start point
    Sorry I don't follow. Are you saying the AFR is reading wrong therefore sending the wrong signal to the ECU.

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    Do Luck owning Club Member Swampy442's Avatar
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    14 is the ideal fuel/air ratio, anything less than that, say 10 is rich, anything above that, say 16, is running lean.
    I would gladly pay you £10 to never log onto this forum again, and I am serious. Scott M

    Quote Originally Posted by Chris Wilson View Post
    I did terrible things to girls I had only just met, and they loved it.

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    Snowboard Man Club Member cainhead's Avatar
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    okay still pretty lost, the car starts really lumpy for about 10 seconds then smooths out and idles fairly normally, but AFR is constantly reading 10 until i blip the throttle and it rises to about 12 then goes back to 10. i connected the ecu to my tablet (standard aem software) and noticed with the engine off when i press the accelerator down the throttle percentage rises and falls as you would expect which says to me the ecu is getting a normal throttle reading.

    could the wide band sensor have gone? Why would the afr read as if im on full throttle/boost?

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    Me? Post? Never! Club Member Style's Avatar
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    Sounds like a sticky idle control valve. Cars just pissing in fuel as it has no air control and can’t hit its targets?
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    Snowboard Man Club Member cainhead's Avatar
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    Quote Originally Posted by Style View Post
    Sounds like a sticky idle control valve. Cars just pissing in fuel as it has no air control and canít hit its targets?
    yes its firing out black smoke whilst it trying to settle so its certainly seems to be over fuelling. Just found a guide to cleaning the IACV so ill try that first

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    Snowboard Man Club Member cainhead's Avatar
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    Quote Originally Posted by cainhead View Post
    yes its firing out black smoke whilst it trying to settle so its certainly seems to be over fuelling. Just found a guide to cleaning the IACV so ill try that first
    Managed to clean the IACV and no joy. It's there anyway to test these?

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    Me? Post? Never! Club Member Style's Avatar
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    Quote Originally Posted by cainhead View Post
    Managed to clean the IACV and no joy. It's there anyway to test these?
    Is the ECU showing anything for it when plugged in? I think it’s meant to make a clicking sound when you turn off the engine. Maybe see if you can hear it doing that to rule it in our out?
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    Snowboard Man Club Member cainhead's Avatar
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    Quote Originally Posted by Style View Post
    Is the ECU showing anything for it when plugged in? I think itís meant to make a clicking sound when you turn off the engine. Maybe see if you can hear it doing that to rule it in our out?
    Not sure on the clicking my exhaust is pretty loud (hks ti) plus it's in my garage so doubles the echo. Car is really spluttering and firing out a lot of black stuff.

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    Me? Post? Never! Club Member Style's Avatar
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    Quote Originally Posted by cainhead View Post
    Not sure on the clicking my exhaust is pretty loud (hks ti) plus it's in my garage so doubles the echo. Car is really spluttering and firing out a lot of black stuff.
    o2 sensor may be on the way out like you say. I'm having a sort of similar problem y'see so it would be good to get to the bottom of it for both our sakes lol
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    Could be a stuck open injector - you should be able to test the injector outputs with the ecu software.

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