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Thread: Throttle body clean - HUGE BANG!

  1. #1
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    Default Throttle body clean - HUGE BANG!

    Did a full service today...

    Before I changed plugs, cleaned filter etc, I decided the clean the throttle body etc, with carb/injector cleaner, the same way I always did on my old Vec B.

    I disconnected the airbox, MAF etc and sprayed carb cleaner into the throttle body, but where on my Vec B I could rev the engine myself by pulling the cable, I had to signal to my girlfriend to press the accelerator pedal to keep the revs up as they dropped. Unfortunatly she didn't get it quite right, and the engine stalled. I got her to restart, but there was one God-almighty BANG as the engine turned over!

    Everything seems to run ok, but I'm very curious as to what caused the huge bang (it was as if someone had fired a gun in the garage!).

    Any ideas?

    I'm wondering if maybe the carb cleaner condensed in the inlet manifold, and then exploded when the engine tried to fire again... Thankfully I don't think there's been any damage, but I'd like to know what on earth happened!

    Cheers!

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    Full Member chrisvectra's Avatar
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    it back fired bud lol
    VXR IS FOR LIFE NOT JUST FOR THRILLS !



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    Full Member Leemarksmith's Avatar
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    Its just unburnt fuel or what your spraying thats ignited down the exhaust system...

    My mate used to do this all the time in his corsa on purpose through town.

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    Regular Member SignumPhil's Avatar
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    As long as the bang didn't damage the cat.....

    Phil

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    Regular Member Maverick's Avatar
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    If your going service a car then great, it saves a few ££££ etc, but what I can't get my head round is when people take things apart and clean them when there is not a fault.

    There has been so many stories about throttle bodies/EGR valves etc being cleaned out when they are not playing up, then problems arise afterwards.

    I am a firm beleiver that if it ain't broke then don't fix it.

    I had my Signum in the dealers yesterday to have the hand brake replaced, apparently it didn't get dome by the supplying dealer when the modified part was issued.

    I asked if it is worth checking out the EGR valve, and if it had the latest version, I was told that it was the EGR software that was modified and mine is running the latest version of the software, and as for cleaning, it's not playing up so don't mess with it.

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    Regular Member Stuarty's Avatar
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    Surely cleaning out the egr is good practice as your preventing a build up of crud in there that in time will more than likley cause issues?

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    Regular Member nikroc's Avatar
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    Prevention better than cure?..

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    Regular Member Sean-2.2Direct's Avatar
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    Quote Originally Posted by nikroc View Post
    Prevention better than cure?..
    Yes it is mate

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    Quote Originally Posted by Sean-2.2Direct View Post
    Yes it is mate
    +2. As I see it, thats what serviing is all about.

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    Quote Originally Posted by SignumPhil View Post
    As long as the bang didn't damage the cat.....

    Phil
    Yep!

    The bang occurs when unburnt fuel hits the hot CAT (200+ degree's).

    It's ok on something with no CAT (generally non fuel injected), but it cat cause serious damage to your CAT, unburnt petrol (not only the bang itself) destroys the ceramic materials.
    It can also destroy your lambda sensor.

    My Westfield backfires a lot when I back off the throttle, this is because it's twin 40 webbers are still pumping fuel in as the engine slows down, the fuel runs into the exhaust and explodes. This is just a sign of an overtuned classic engine (Ford x-flow from 1979).
    Infact if I hold the throttle at the point where the main jets are just opening, it'll do this all the way down the road

    Newer cars that do this, generally do so because the owner thinks it's cool to wreck his car. It damages the CAT (although they tend to remove them until MOT time), the lambda, the valves and it ruins the synthetic engine oil (reducing lubrication) because some of the excess fuel has nowhere to go but to wash down past the piston rings.
    Unless the whole engine has been rebuilt for performance, it's not a good idea.

    Good news is, just doing this once is unlikely to cause any real damage!
    Last edited by Birchy63; 15th January 2010 at 13:56.

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