Ford Falcon: LPG Backfiring

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My AU3 LPG Ford Falcon, which has done 270,000 km backfires occasionally. It has had a reconditioned head fitted, also a new gas converter, new leads and spark plugs. It usually does it at traffic lights with the air-conditioning on, but not when the mechanic has it. He says everything checks out fine. Any ideas?

Answered by CarsGuide

21 December 2010

Graham Smith

A random spark in the inlet manifold usually causes backfiring and the most common cause of that is a faulty spark plug lead. The mechanic would struggle to find it if it only happens occasionally, and when he’s not around. I would fit new spark leads, and make sure they are a good quality, even though you say you have fitted new ones.

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