why did my airbox explode when I bumped started my beetle convertible ?

2004 VOLKSWAGEN BEETLE
70,000 MILES
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P.D.GALE
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The battery was flat and we bumped off the car in reverse. There was a loud bang and smoke poured out of the bonnet. On inpection the airbox had been damaged and the battery cover. I had to buy new parts and battery which came to £283

Regards Paul Gale
Oct 19, 2011 at 8:56 PM
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MHPAUTOS
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If you tried to start with a poor battery the injectors will still inject fuel and poor coil voltage will not ignite the mixture, with the booster battery you have had a massive inlet back fire, this is the unburnt fuel laying in the manifold and igniting, i would say this has caused your damage, under normal running conditions this will not happen.
Oct 27, 2011 at 7:27 AM