Are you having problems with your 1997 Holden Calais? Let our team of motoring experts keep you up to date with all of the latest 1997 Holden Calais issues & faults. We have gathered all of the most frequently asked questions and problems relating to the 1997 Holden Calais in one spot to help you decide if it's a smart buy.
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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.