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02 Corolla VVTI - Revs jumping when idle

  • 10-09-2011 8:21pm
    #1
    Left Field
    Registered Users, Registered Users 2 Posts: 28 ✭


    Hi,

    I have recently changed the air intake manifold in my 2002, 1.4 Corolla, (cracked baffle - common on Corollas apparently). After installing the new manifold, flushing and filling the collant and disconnecting the battery there is an issue when the car is idling.

    It is usually ok from a cold start but if left to idle for say 5mins, (I noticed when fillng the collant), the revs start to jump between 1100rpm and 1200rpm. Every second or two the rev counter jumps up to 1200 and then back down to 1100 - very strange.

    Does anyone know what this could be? The throttle cable is a little slack but I don't think this could be causing the issue as it does not affect the assemble when idle.

    Any thoughts would be appreciated.
    Tagged:


Comments

  • #2
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    1100 - 1200 is very high for it to be idleing anyway.

    Did you use a new gasket for the inlet manifold and throttle body and did you make sure that the sealing faces were completely clean?

    A missed or split vacume pipe is another possibility too.


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