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Thread: Violent Throttle Body Explosions

  
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    jm-darcy's Avatar
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    Violent Throttle Body Explosions

    Hello all,

    What could be causing massive back fires in my throttle body when I try to start the car? The first time it happened, it blew my airbox open! They are violent explosions and the whole air intake and indeed inside the cam cover all stink of fresh fuel?

    Any ideas? I am at a loss. I have just replaced the head gasket so the car has been in many pieces.

    The HT leads are definitely on correctly.

    I have just performed a compression test and got good readings. Surely this means that the valves are working and that the physical timing is correct?

    That just leaves electric timing.

    Does anyone have any other inputs or ideas?

    Any advice or thoughts would be welcomed.

    Darcy

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    LEE69's Avatar
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    Sounds like the timing is 180 deg out.

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    Enigma ???'s Avatar
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    What above said but as far as electric timing don't think so more mechanical as above said

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    dannysport18's Avatar
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    What engine do you have

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    It is the X20XEV engine. The weird thing is that I have had her running for a few minutes. I then stopped the engine, and when I tried to re-start, that is when the explosion happened. I had changed nothing. Is it even possible for the engine to run if the timing was 180° out?

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    I would look at the Timing on the Cam an crank see if its all ok

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    I believe the timing is okay. I have checked, double checked and triple checked and it looks bang on. If the timing was off, surely the compression test would show poor readings? Also, there is the fact that she ran. If timing was off (or indeed it was 180° out), surely she wouldn't go?

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    sdbutler10's Avatar
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    the timing is out mate on the crank sensor. it probley damaged or dead. i had this on my old astra and it did the same thing urs has.
    888
    No. 32

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    I have changed the crank sensor for a new one as I thought that may be the problem and the old on was very tired (bare wires). Could it be cam sensor instead as I am yet to change that?

    Even if it was the crank sensor (i.e. new one is not working), would it not go into limp mode and still run without back firing?

    Thank you for your help, I really hope to get to the bottom of this.

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    andys sri-t's Avatar
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    id say plug leads on wrong or the timing is out
    never drink and drive .you might spill your drink
    **** n/a turbo is the way

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