Question about 1999 Land Rover Discovery
The car was converted to run on LPG, and this problem has occured since doing this.
LPG backfires can be caused by electrical issues, so first thing to do is check the plugs & leads. I'm also told that it can be more prevalent depending upon whether it's a single point or multi point conversion.
Posted on Feb 25, 2010
If an inlet valve stuck or has a crack - it may ignite the rest of the gas/air mix - causng a backfire into the airbox.
This may be temporary or a permanent- recurring problem. Only by taking the head off can you check valve conditions and that all springs and guides are good.
This is the most likely cause - pre-ignition from a slow to close valve.
Posted on Feb 04, 2009
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