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Thread: b18c1 having problem with new p72 ecu

  1. 04-01-2011, 10:06 AM #1
    iuvo114
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    Default b18c1 having problem with new p72 ecu

    i just replaced my p28 with virgin p72, the car felt idle good but had no idea about vtec when i drive it just not kick in @.@ plzzzzzzzzzzz help !!!!!
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  2. 04-01-2011, 10:18 AM #2
    Starrfire
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    any codes? and do you have everything wired up like Knock sensor and Iab's? Does it still have the stock manifold or an aftermarket single runner one?
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  3. 04-01-2011, 02:54 PM #3
    gerardojdm
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    What car is the GS-R to begin with? Did VTEC work before?
    resize pic
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  4. 04-01-2011, 04:52 PM #4
    Tech5
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    Most likely it's the knock sensor as the P28 don't search for a signal for that sensor as the P72 does .
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  5. 04-01-2011, 06:51 PM #5
    RBS
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    Quote Originally Posted by Tech5 View Post
    Most likely it's the knock sensor as the P28 don't search for a signal for that sensor as the P72 does .

    knock sensor on OBD1 cars dont disable vtec, i had no knock with my GSR in 95 civic/unchipped p72. vtec worked.



    maybe the OP original p28 was chipped, and now with a unchipped ecu it is looking for sensors the chip eliminates
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  6. 04-01-2011, 08:44 PM #6
    *EFilliated*
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    The info is no were near enough for people to try and help
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  7. 04-01-2011, 10:02 PM #7
    mitch lab
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    was vtec working before in the p28 ecu?
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  8. 04-01-2011, 10:48 PM #8
    Tech5
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    Quote Originally Posted by RBS View Post
    knock sensor on OBD1 cars dont disable vtec, i had no knock with my GSR in 95 civic/unchipped p72. vtec worked.



    maybe the OP original p28 was chipped, and now with a unchipped ecu it is looking for sensors the chip eliminates
    wrong

    P28 and JDM is the only ecu's that don't look for the signal

    p30 USDM and P72 USDM do so you have to have a knock sensor
    Last edited by Tech5; 04-02-2011 at 12:35 AM.
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  9. 04-01-2011, 11:13 PM #9
    im_hung
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    Quote Originally Posted by *EFilliated* View Post
    The info is no were near enough for people to try and help
    ^x2...
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  10. 04-02-2011, 12:14 AM #10
    RBS
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    Quote Originally Posted by Tech5 View Post
    wrong

    P28 and JDM is the only ecu's that don't look for the signal

    p30 USDM and P72 USDM do

    nononononononono, i meant with a knock or without it should not disable vtec.
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  11. 04-02-2011, 12:37 AM #11
    Tech5
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    Quote Originally Posted by RBS View Post
    nononononononono, i meant with a knock or without it should not disable vtec.
    It does if you use P30 USDM or a P72 USDM so with these two ecu's you need a Knock sensor ....If you use a p28 then it will not which is a favor ECU that most use anyways. So why run a P72 anyways?

    Also if his butterfly wire isn't hooked up that could also be a issue
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  12. 04-02-2011, 01:19 AM #12
    RBS
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    Quote Originally Posted by Tech5 View Post
    It does if you use P30 USDM or a P72 USDM so with these two ecu's you need a Knock sensor ....If you use a p28 then it will not which is a favor ECU that most use anyways. So why run a P72 anyways?

    Also if his butterfly wire isn't hooked up that could also be a issue


    oh Josh, you are so missing the point lol


    basically what i meant was even though a p30 and p72 search for knock sensor, it does not affect vtec; from my experiences that is
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