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Thread: GZE, dead mid to top end

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    Senior Member ae86 slide's Avatar
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    Default GZE, dead mid to top end


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    Ive recently gotten my 86 going, there is still a vacuum leak (it keeps hunting for idol) which i still need to find. Everything else seems ok, timing is perfect, fuel pressure is good (adjusted the regulator to sit at 32psi at idol). And as far as i can tell ECU is fine.
    It hesitates to rev down low then revs well for a bit (about 1500 revs) then just goes dead.

    If anyone could give me an idea of what to check i would very much appreciate it.

    Cheers guys, Jase

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    What condition are the plugs in?
    Are you getting a strong spark?

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    Senior Member ae86 slide's Avatar
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    good question, ill check them tomorrow. Also its an AE101 for a bit more info.

    thanks.

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    Site Supporter Javal's Avatar
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    Quote Originally Posted by ae86 slide View Post
    Ive recently gotten my 86 going, there is still a vacuum leak (it keeps hunting for idol) which i still need to find. Everything else seems ok, timing is perfect, fuel pressure is good (adjusted the regulator to sit at 32psi at idol). And as far as i can tell ECU is fine.
    It hesitates to rev down low then revs well for a bit (about 1500 revs) then just goes dead.

    If anyone could give me an idea of what to check i would very much appreciate it.

    Cheers guys, Jase
    Well, first off i'd find that vacuum leak.

    Then if it's still actually misfiring, i'd check your ignition system.
    You can have any brew you want... as long as it's a Datsun / Corolla / What is that?

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    you need to fix the vacumn leak first

    and its idle

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    Senior Member ae86 slide's Avatar
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    roger, will do. Didnt realise this could be messing with it so much,

    thanks again guys.

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    Site Supporter Javal's Avatar
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    Quote Originally Posted by ae86 slide View Post
    roger, will do. Didnt realise this could be messing with it so much,

    thanks again guys.

    Absolutely!

    Had a bloke i know with similar problems to yours on his GZE - turned out he had a MASSIVE vacuum leak from his s/c inlet pipe which he'd made himself. His welding left alot to be desired.
    You can have any brew you want... as long as it's a Datsun / Corolla / What is that?

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    Senior Member ae86 slide's Avatar
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    Well, i searched high and low, but no leak was found, also tried spraying water on suspect areas (ment to momentarily seal the leak).
    But i was speaking to someone tonight and they told me almost all ze's hunt for idol a bit.
    And i drove it the other day and it felt quite good, one thing that has me stumped though is that when i turn the ignition off it tries to run for a bit, is that another sign of a vacumm leak?

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    Senior Member Hen may possibly be a nut's Avatar
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    Check all the obvious things like timing, cam timing, error codes, vac leaks again etc etc. There could be a number of reasons why it runs on, or runs badly.

    4AGZEs have a long inlet post-throttle, this means idle control is slow. Adding a frontmount cooler makes this problem worse. So sometimes the engine can "fall through" idle when clutching in from a few revs. You can up the idle speed a little or just cope and get used to toeing it a little as the revs fall. It can also result in hunting idle. On the stock computer some people seem to have hunting issues, others don't. With aftermarket ECUs the idle is a bit of a pain to tune nicely, but can be done.

    Hen

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    Senior Member ae86 slide's Avatar
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    Yeah really not fussed about the idol, its a track only car anyway so its going to be full throttle or none. I will stop looking for a prob that doesnt exist, thanks for the help lads.

    Jase

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