Outer Limits 4x4 Board

Hey guys , I just installed a safari snorkle on my GQ , but am having some problems running on gas.Its a 93 petrol efi, and seems to run fine on petrol but not gas now , and also when on gas the air filter light on the dash is coming on. Any help would be appreciated, shane......

try turning the air ram around the other way...

There are heaps of threads on this so do a search, but from my recolection this was the main consensous(sp?)...

Dave

the air filter light comes on when there is a greater pressure difference across the filter, like when it is partially blocked.
sometimes gas systems don't like snorkels because the ram effect when moving (air being pushed down the snorkel) or the restriction of a much longer intake runner.
the convertor takes an air pressure reference from a vent on its body.
this vent should have the same pressure reading as the air intake, but it doesn't
you can insert a barb into convertor and run a 5/8 hose to the snorkel, this becomes a balance line. it works, i've done it!
can also turn the head backwards like dave says,
have it dynod find the rich/lean spots and adjust, then drive on the road with an incar mixture meter to check results.
take it to a reputable gas tuner and say wtf???
david.
do a search as well you lazy mofo

thanks for the info guys , will try a searh now .....

have been searching ,and came up with nothing ??

Bagsy

There is a tread on this on works BB. I'll have a look and post the details.

In short it has something to do with the differential pressure across the mixer that gets screwed up when the vehicle is fitted with a snorkel. I check but from menory the fix is to plumb a hose from the mixer port open to atmosphere to a point in your intake system. Can't remember if it should be before or after your air box. Will check and post the detail tomorrow night.

Cheers
Ben.

thanks ben...

the hose works best when it references the air pressure as it enters the motor/carby/throttledody/gas mixer.
i imagine it would be just before the gas is introduced to the intake as long as that point was also before the petrol was introduced (KABOOM)
basically the line equalises the pressure between the convertor and the intake point of the gas.
david

Run a balance hose from convertor to dirty side of aircleraner.

Bazzle

yeah what bazzle and modman said.

only way is to put a balance pipe in. its cheap and easy. all you need is a barb and a bit of rubber hose/fuel line. cost you about 10 bucks.

thanks guys , will sort this out on the weekend. much appreciated, shane...

Bagsy

As promised the whole thread is below. But it looks like you have got the info anyway.

Cheers
Ben

> -----Original Message-----
> From: Pete
> Posted At: Monday, 24 May 2004 13:17
> Posted To: 4wd
> Conversation: LPG
> Subject: LPG
>
> Thanks all for your replies. Paul has had the same problem as I am
> experiencing and Michael has the solution. Where exactly did the upstream
> vac hose get attached? I can get one on the inlet to the air cleaner very
> easily, would that be a good spot?. I have a '92 80 series.
>
> Thanks.
>
> -----Original Message-----
> From: eddy
> Posted At: Monday, 24 May 2004 10:54
> Posted To: 4wd
> Conversation: LPG
> Subject: LPG
>
> Yep as below fixed mine. It used to stall (after snorkel fitment) when
> clutch de-pressed. Eg. changing gears at speeds in excess of 20kph. Took
> it to LPG guy in Penrith and he did as below. Runs like a dream now.
>
> Eddy
>
> -----Original Message-----
> From: Dopo
> Posted At: Monday, 24 May 2004 9:29
> Posted To: 4wd
> Conversation: LPG
> Subject: LPG and snorkel
>
> Pete
>
> On the gas regulator / mixer you have a line that sensors atmospheric
> pressure. Should be just an open pipe that just comes out of the
> regulator. It comes from one side of the diaphragm. The other side of
> the diaphragm sensors vacuum from the engine intake.
>
> When you put a snorkel on the vehicle, you are getting ram air at the
> inside of the aircleaner which upsets the pressure balance in the
> regulator / mixer.
>
> Run a rubber hose from the open line on the regulator to the upstream side
> of your aircleaner box. So between the snorkel and aircleaner box. You
> will need to fit a suitable union at the aircleaner. Clamp all
> connections.
>
> This balances the pressure being senored at the diaphragm and will ensure
> the regulator / mixer works correctly.
>
> Some LPG installers will set up the system this way even without a
> snorkel, to take into account blocked air filters. I never let my air
> filter get that bad )
>
> Dopo
>
> -----Original Message-----
> From: Pete
> Posted At: Monday, 24 May 2004 7:57
> Posted To: 4wd
> Conversation: LPG
> Subject: LPG
>
> Anyone out there in 4WD land have a LPG powered truck with a
> snorkel? If so did you have any trouble with the LPG side of life working
> in conjunction with the snorkel.
>
> Thanks.
>
> Pete. R.