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Thread: Famous for engine knock-Corolla 1984 but why?

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    Default Famous for engine knock-Corolla 1984 but why?

    Its every mechanic's statement "Corolla 84 ka 8 valve wala boht knocking karta hai, bekar engine hai, is may fault aya hai"

    But I wonder why?

    I am also a victim of similar issue, as I own a Corolla AE80 with 2A engine (wohi 8 valve wala). And it knocks as hell. Checked timing several times, but no solution. Upon retarding timing, knocking decreases but pick goes away.

    Can anybody tell me what is the solution? or can confirm whether the statement is true. Special response request from Xulfiqar bhai.
    Prepare for the worst, Hope for the best.

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    Maybe A Congested Combustion Chamber Or Design That Cause Carbon Deposit Or High Temp Can Cause It.....!

    Higher Comp Ratios Can Be The Cause As Fuel Is Also Not Good Of Quality Here.....!

    Xulfiqar Can Explain It Further More In Details .....! Those Are Quiet Few Models I Have Seen Here....!
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    Excessive carbon deposits causing pre ignition maybe. Try colder heat range plugs.
    Keep a cool head and wear seatbelts!

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    Thankx brothers. Good suggestion with plug's heat range. I will check them today.
    Prepare for the worst, Hope for the best.

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    Quote Originally Posted by spectra View Post
    Excessive carbon deposits causing pre ignition maybe. Try colder heat range plugs.
    Plug is DENSO W16EX-U. Checked from DENSO Site, it say it is the correct plug. Manual also says the same plug.
    Prepare for the worst, Hope for the best.

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    check distributor vacuum advance system, maybe it is keeping it advanced unnecessarily. I have same car in family and it never gave such issues even on adulterated fuels we have here.
    Keep a cool head and wear seatbelts!

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    you need to use colder plugs - 20 heat range in ND and 6 in NGK, make sure the distributor centrifugal advance is smooth and good - rotate the rotor arm and let go, it should snap back - if its mushy you need to overhaul the distributor.

    btw - firstly make sure the vacuum advance pod is good and goes to the correct vacuum port in the carburettor, secondly make sure you set the timing correctly

    The crazy knock is also caused by engine hot spots, meaning if your cylinder head cooling galleries are badly rusted internally. Clean it out
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Try W20Ex-U

    Try Dizzy Functioning As Stated.....!!

    There Are Many Reasons Of It......I Never Even Listen Local Mechanics MYTH As Most of Them Are Just A result Of Their Sheer Foolishness..
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    Thankx Xulfiqar bhai.
    I anyways have to change plugs bcuz they are old enough to be replaced.
    VAC Advance will be check during weekend.
    Cylinder head galleries cleaning, have to think about when to open it.

    Quote Originally Posted by Xulfiqar View Post
    you need to use colder plugs - 20 heat range in ND and 6 in NGK, make sure the distributor centrifugal advance is smooth and good - rotate the rotor arm and let go, it should snap back - if its mushy you need to overhaul the distributor.

    btw - firstly make sure the vacuum advance pod is good and goes to the correct vacuum port in the carburettor, secondly make sure you set the timing correctly

    The crazy knock is also caused by engine hot spots, meaning if your cylinder head cooling galleries are badly rusted internally. Clean it out
    Prepare for the worst, Hope for the best.

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    for galleries cleaning, do a cooling system flush. Liqui moly is god. after that use a good coolant Pyro if available in Karachi is good for old cars.
    Keep a cool head and wear seatbelts!

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