Mitsubishi Challenger 2000: LPG Backfire problem
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Asked by Bob Randall
ONE of the reasons we bought our Challenger in 2000 was that Mitsubishi was the only maker of this size four-wheel drive to give us a guarantee in writing that fitting LPG was OK. We had the dealer fit the Impco system. From time to time we have had a small backfire that has dislodged the aluminium grille, just in front of the air sensor. Our local Mitsubishi dealer just refits the old grille. Their price to replace the system is $860 as it is not supplied separately from the whole metering device. We consider that far too expensive for such a small problem. Is there a cheaper alternative to the factory part we could use?
Answered by CarsGuide
24 May 2007THERE is something wrong with your car that is causing the backfire. It's not unusual with a vapour-mixer system like yours, but it shouldn't occur if the engine and, particularly the ignition system, is in good condition and set correctly. The explosion is caused by the LPG/air mixture in the intake manifold igniting, and it's usually because of a stray spark. Check the condition of the spark plug leads and go right through the engine settings and make sure that are correct.
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