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Thread: Significant drop in RPM with headlights ON!

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    Default Significant drop in RPM with headlights ON!

    Asalam o alaiqum,

    As per the title, I get a significant drop of 300 RPM when I turn on the headlights and the RPM comes to down to 500-450. In day times when there's no need of lights RPM stays and 800-750. Other than that whenever I stop at signals or with idle car but in start position headlamps and dashboard lights go dim and backups up when the accelerator is being pressed.

    Engine specs are: 4E Toyota engine
    Car: Toyota AE90
    Radiator Fan: Direct connection.

    What I want to ask is this because of some faulty sensor or its just normal? Moreover I also need genuine wiring of 4E Toyota engine with engine check light capability.

    Thanks


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    Check your alternator
    Turbo lag is like foreplay. You know it's coming. And it's gonna be good.

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    there quite be 2 reason for that,
    1. Low battery
    2. Generator is not functioning properly

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    ELS wire from ecu is not connected with ur tail lights, connect ELS (electric load signal) wire from ecu to lights ( positive wire )in dash or tail lights , with that ecu will come to know that lights r switched ON , it will raise rpm automatically
    dont forget to add a 10A fuse in between
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    but only in case if it is a efi motor
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    ELS dissconection could be the 1 reason. If it was previously working fine then cleaning of IAC(Idle Air Control) valve may solve the issue.
    Exploring Machines is my Passion...

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    Quote Originally Posted by born2hurt View Post
    Asalam o alaiqum,

    As per the title, I get a significant drop of 300 RPM when I turn on the headlights and the RPM comes to down to 500-450. In day times when there's no need of lights RPM stays and 800-750. Other than that whenever I stop at signals or with idle car but in start position headlamps and dashboard lights go dim and backups up when the accelerator is being pressed.

    Engine specs are: 4E Toyota engine
    Car: Toyota AE90
    Radiator Fan: Direct connection.

    What I want to ask is this because of some faulty sensor or its just normal? Moreover I also need genuine wiring of 4E Toyota engine with engine check light capability.

    Thanks
    Ur car's Electric load signal wire is not connected from ECU to the headlamps wiring. This is the only reason for which ur car is unable to maintain idling.

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