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Are you having problems with your 1995 Holden Calais? Let our team of motoring experts keep you up to date with all of the latest 1995 Holden Calais issues & faults. We have gathered all of the most frequently asked questions and problems relating to the 1995 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.
IT SOUNDS as if the chips are caused by stones and other debris thrown up by other cars. There's nothing much you can do to protect it, other than use a car-bra. If you don't want to do that, I would touch up the chips so they're not so obvious, and keep your car waxed and polished so the stones and other things tend to slip off the surface.