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Illegal LPG conversions actually used to be fairly common in my country, mostly relying on home LPG bottles and no vaporizer, yet the intake manifold would often freeze. The only car converted to use CNG (yet still capable of using gasoline) on which I saw the intake manifold freezing was a mid-'90s "baby Camry" Corolla which an uncle of mine used to own, with the 7A-FE engine. Such uncle used to claim cars older than '97 were better suited for a CNG conversion because they're not legally required to be fitted with an electronically-controlled (always more expensive) conversion kit, yet a multi-port CNG injection would've been better suited to the 4A-FE anyways...
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