Quote Originally Posted by ghosthunter View Post
Have you tried using hotter rated sparkplugs than what you already have in your engine? Since your driving style sees more idling, your current sparkplugs might be too "cold" which results in fouling.

Regular hotter sparkplugs are cheaper than special iridium sparkplugs anyway.

Note to other auto-lpg users: sometimes other cars run better with colder sparkplugs. It plainly depends on the engine and your driving style/habits.
It's not more of the long idling I guess, when I drove to airport at high speed last Tuesday, real hard fouling came day after it so it must be a colder spark plug to be use.

Bad thing is when I called up Denso distrubutor they would not have the colder plug this month. I'm force now to use their one grade colder Iridium. P600 x 4

Innova (1TR-FE) and Fortuner (2TR-FE) uses long reach plugs even NGK and Bosch don't have much lineup for these kind of plugs.