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Calais backfiring

Asked by Bob Mulley

My VS V6 Holden Calais has started to backfire occasionally through the Air Filter Box. The installer told me to fit new spark plugs and leads, which I have done, but it is still happening. Could it be bad or dirty LPG?

Answered by CarsGuide

19 Apr 2012 Graham Smith

The backfire you are hearing is the gas igniting in the intake manifold, which is quite common with cars running on LPG. A random spark usually causes it, and the plug leads usually cause that. It's not the LPG. I'd take it back to the installer and get his help.

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