7MGTE ISCV Position

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Thread: 7MGTE ISCV Position

  1. #1

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    7MGTE ISCV Position

    My 87 Turbo is currently idling at lower than stock RPMs (500). So, checked all my vacuum lines, both metallic and rubber which look to be all good. I pulled my ISCV and was surprised that it was fairly clean, even the inside chamber after I removed the 3 bolts. There was some black soot and carbon but a few wipes inside of ISCV and where it bolts to intake manifold cleaned everything up.
    Check valve and rubber O-ring were also cleaned up.
    Doesn't the ECU close ISCV when the engine is shut-off? I'm not sure if my ISCV is in the closed position since the tapered "plug" is not touching the opening of the mounting flange. It looks like the plug needs to travel another 3/16" or so outwards before closing up the opening.

    I had started the engine earlier before removing the ISCV and made sure that ISCV made the clicking sounds when the engine is shut-off ( which it did for about two seconds).

    Can you all look at my ISCV picture and let me know if this is indeed the closed position?
    Thanks in advance.

    edit: I also went ahead and checked resistance at the ISCV connections and they are all within spec according to TSRM.

    Last edited by OldBonus; 04-09-2019 at 02:42 PM.

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  3. #2
    7M Fanatic sixpack's Avatar
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    Have you checked the throttle closed stop position, or how much crap is built up in your throttle ?
    (procedure is in the TSRM)
    Throttle stops wear, and throttle butterflies gunk up.

    Also, how did it get the iscv get so clean ?
    Did someone take it apart ?

  4. #3

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    Quote Originally Posted by sixpack View Post
    Have you checked the throttle closed stop position, or how much crap is built up in your throttle ?
    (procedure is in the TSRM)
    Throttle stops wear, and throttle butterflies gunk up.
    Thanks for the reply. I'll go check on the throttle and report back.

    Quote Originally Posted by sixpack View Post
    Also, how did it get the iscv get so clean ?
    Did someone take it apart ?
    That's what puzzles me since I know the previous owner didn't do a good job maintaining this car. So, I'm not sure if it was taken apart and the previous owner did not mention it among things done to this car.

    For what it's worth, this car has a little over 125k miles on the odometer.

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  6. #4

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    Quote Originally Posted by sixpack View Post
    Have you checked the throttle closed stop position, or how much crap is built up in your throttle ?
    (procedure is in the TSRM)
    Throttle stops wear, and throttle butterflies gunk up.
    Quote Originally Posted by OldBonus View Post
    Thanks for the reply. I'll go check on the throttle and report back.
    This is what greeted me when I pulled my intake tube

    Thanks for pointing me in this direction sixpack!
    By the way, throttle butterflies didn't have any crap built up




  7. #5
    90T 3p141592654's Avatar
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    Those couplers are typically cracked and hard to spot. The ISCV will be fully OPEN at shutoff. That is why you get a momentary fast idle on startup. Yours looks to be open as it should be.

  8. #6

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    Quote Originally Posted by 3p141592654 View Post
    Those couplers are typically cracked and hard to spot. The ISCV will be fully OPEN at shutoff. That is why you get a momentary fast idle on startup. Yours looks to be open as it should be.
    Thanks for confirming this!

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