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Thread: went to start disco had back fire through airbox now wont start could it be air flow

  1. 29th June 2011, 03:25 PM #1
    krazy kiwi
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    went to start disco had back fire through airbox now wont start could it be air flow

    am running strate gas in 3.9 disco when cranking over it back fired through the airbox now it just cranks over and wont fire could it be the air flow meter
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  2. 29th June 2011, 05:58 PM #2
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    bee utey
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    Quote Originally Posted by krazy kiwi View Post
    am running strate gas in 3.9 disco when cranking over it back fired through the airbox now it just cranks over and wont fire could it be the air flow meter
    The air flow meter does nothing while its running on gas. Look for hoses fallen off around the back of the manifold. I have seen the main intake hoses split in half too. If you are running Impco (puke) they are prone to shattering internally on a backfire, quite common. Which system are you running?
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  3. 1st July 2011, 11:22 AM #3
    krazy kiwi
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    sorry for the late reply my internets been down for a few days. not sure if its impco system as cant see name on mixer but what i can see is m9-2 model 200 on the top is a sticker that has 200 ca on it if that helps
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  4. 1st July 2011, 08:09 PM #4
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    Quote Originally Posted by krazy kiwi View Post
    sorry for the late reply my internets been down for a few days. not sure if its impco system as cant see name on mixer but what i can see is m9-2 model 200 on the top is a sticker that has 200 ca on it if that helps
    Yup Impco model 200. Unscrew the lid (5 screws) and see if the lid or the diaphragm are damaged. I've got a couple of spares if you get desparate.
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  5. 2nd July 2011, 11:55 AM #5
    krazy kiwi
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    ok so i managed to get the disco home to work on it today as it had been at the truck yard i work at i had to tow it home as we left the yard i crabbed 2nd gear let the clutch out it back fired twice through the air box then started i drove it home (it ran fine)got home pulled the mixer off and its fine no cracks in the top or the diaphram and now it starts on the key again anymore ideas would be good please as i dont want it to happen again and realy want to fix it. Ive just spent $2500 getting a new clutch a tune up and fix oil leaks well it still leaks oil and im about ready to sell it (or have a big bonfire)
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  6. 2nd July 2011, 04:54 PM #6
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    Look, it all sounds like ignition problems. Firstly make sure your plug gaps don't exceed 0.7mm. Secondly set the ignition timing to 10 degrees BTDC at idle. Thirdly make sure your dissy cap is totally clean and dry inside and outside, and in good condition. 4thly don't have the plug leads in tightly tied bunches, keep at least 10mm air between them where possible. 5thly check ALL connections around the ignition coil are clean and tight. I can't stress enough how important good electrical connections are for ignition on gas. If this doesn't do it you probably need to replace/upgrade the ignition amp and coil.
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