air filter box

Sorry Gunnie, but it happens to most LPG powered vehicles if you muck around with the accelaerator in the starting process. I did it to my Fairmont, and blew the air box up. Frightenedbleepout of my wife who was asleep in the bedroom next to the garage, now that was pretty funny.

I don't think you can fix it, other than getting the car tuned by a gas specialist, and not touching the accelerator when starting.

HI there,
same problem with my 94GQ. New air box is something like $950....%&#

In Penrith there is a wrecker, Penrith Auto Wreckers, which has a few Patrols Ph. 02 4732 3499. Cost me $150 for the airbox a month ago.

Hope this helps.

We just got rid of our gas. It was a pain in the backside. The constant dedededededededede when you go to start it (all of you who have gas know the sound), it runs likebleepand you can't tow a thing.

We're back on petrol.

Holden v6's have the same problem, the v8s run good on gas though, hence the amount of v8 holden taxis...
Common fix for the problem was to drill a 20mm hole in the top of the airbox and put a rubber gromit in there, then if it backfires it will blow the gromit out and release the pressure instead of blowing the sh%^ out of the air box.

Gunnie, I'm assuming that as your Patrol is a 93 model it's a fuel injected version. I'm pretty sure that the air filter element in an aftermarket Ryco replacement is an A360 which I believe is also the replacement filter for most V6 commodores.
If this is the case, perhaps a commodore airbox could be modified to suit.
No guarantees but maybe it's an alternative option.
Regards Andrew.

Hi, i've got a '94 EFI 4.2 GQ converted it to gas in '95. When fitted they placed a valve just before throttle flap. Circular, about 20mm wide whith a thick rubber seal around it. Works well, if there is a blow back band lifts and releases gas. Pumped throttle once and what a bang, even smoke poured out, thought it was on fire. Never again. EFI's allways start on petrol so i increased the timer slightly, lot better. If car has been standing for a time i turn the key till fuel pump stops then start, no prob. Last point,one guy said get rid of the gas 1/ I couldn't afford to run on petrol 2/ runs just as well on gas,no differance

have a look at the 4.2 diesal they have a pre cleaner which sits in the front passenger side, you should be able to plumb that to the petrol. Col