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Old 25-06-2006, 02:48 PM   #1
tacticz
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Default AU I Xr6 LPG problem

hey guys,

started my car yesterday morning, running on empty (gas), slowly got to servo, filled the gas tank up, went to leave the servo, as i accelerated car started to backfire sounded like through the intake air box, now the car hardly idles on gas and soon as u put your foot down backfires through air box, switched it over to petrol idles 90 percent alright, but sort of stumbles under hardish acceleration,and idles high on petrol, the gas sytem brand is impco, i turned up the idle on the gas system little screw thing on the left hand side,just wondering if anyone may know or had this problem before.

thanks.
Dan

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Old 25-06-2006, 07:51 PM   #2
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At a guess your first backfire has created an air leak that is resulting in lean mixyures and backfires.
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Old 26-06-2006, 08:25 AM   #3
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As Turbotaxi said .. Being a gas/fuel system though , really it should have the spring type clips holding the airbox lid on, so in cases of hi-pressesure/backfires it can spit the lid up on the airbox to quickly release the backfire / instead of keeping the pressue within the system . Has your airbox got the spring type clips ?
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Old 26-06-2006, 08:36 AM   #4
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I'd also recommend you never let the gas tank run empty.
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Old 26-06-2006, 05:07 PM   #5
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Quote:
Originally Posted by AUII_SE_Ute
I'd also recommend you never let the gas tank run empty.
Second that!

A low/empty tank means a lean mixture. Running lean have can have dire consequences on your motor.
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Old 26-06-2006, 05:18 PM   #6
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Originally Posted by AUII_SE_Ute
I'd also recommend you never let the gas tank run empty.

Have done it by accident ... it's not fun
*mumbles* bloody fuel gauge *mumbles*
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Old 26-06-2006, 06:29 PM   #7
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Quote:
Originally Posted by bazz
Second that!

A low/empty tank means a lean mixture. Running lean have can have dire consequences on your motor.
Why is that bazz, the low tank equalling lean?

Also, what effects, backfiring, worn head etc, etc?

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Old 26-06-2006, 07:37 PM   #8
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mixture runs lean because an lpg system doesnt have a "fuel pump" so to speak, and relies on the liquid pressure from the tank.. and the tank empties, pressure begins to equalise and hence, less liquid flow to the converter and eventually (very near empty) a lean condition..
backfires? vacuum leaks, lean condition and ign. problems
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Old 26-06-2006, 09:56 PM   #9
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Quote:
Originally Posted by V8R
mixture runs lean because an lpg system doesnt have a "fuel pump" so to speak, and relies on the liquid pressure from the tank.. and the tank empties, pressure begins to equalise and hence, less liquid flow to the converter and eventually (very near empty) a lean condition..
backfires? vacuum leaks, lean condition and ign. problems
Cheers for that!

Mental note, refill gas tank before reaching quarter capacity!

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Old 29-06-2006, 08:57 PM   #10
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thanks guys for the info,finally took the car to a gas place and they said wasrunning lean,just happens some times over a period of time and the guy just "scraped the mixer" and it all is good took awhile for the cars computer to work out the mixtures but after 5-10 km's it runs fine only cost me $40 phew!
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Old 29-06-2006, 11:03 PM   #11
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hmmmmm, never heard that before, I always run the tank to empty, without fail. never had any problems along those lines either (well none that werent caused by something else anyway)
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Old 30-06-2006, 04:16 PM   #12
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Quote:
Originally Posted by tacticz
thanks guys for the info,finally took the car to a gas place and they said wasrunning lean,just happens some times over a period of time and the guy just "scraped the mixer" and it all is good took awhile for the cars computer to work out the mixtures but after 5-10 km's it runs fine only cost me $40 phew!
What kind of gas system do you have? Dual or dedicated! If dual, which mixer type?

Glad it's sorted!

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Old 30-06-2006, 04:52 PM   #13
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You have probably blown the vacuum port bung out of the manifold, where the PCV hose usually is. When LPG is fitted the PCV hose is usually re-routed to under the ISC and a bung is fitted over the original port. Have a look under the throttle body, between it and the rocker cover. If its idling high on petrol after a backfire, this is normally what has happened.
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Old 30-06-2006, 05:45 PM   #14
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Quote:
Originally Posted by robbo_yobbo
hmmmmm, never heard that before, I always run the tank to empty, without fail. never had any problems along those lines either (well none that werent caused by something else anyway)
Me three. Only issue I have is that as it's running out, the throttle can only be lightly touched, or it just loses all power.
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Old 30-06-2006, 10:58 PM   #15
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Quote:
Originally Posted by JC
Me three. Only issue I have is that as it's running out, the throttle can only be lightly touched, or it just loses all power.
Yea, thats the worst it ever gets for me when I run the tank dry, I run it out on purpose every time so I got an exact measure on my economy. :dj:
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Old 01-07-2006, 07:12 AM   #16
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Quote:
Originally Posted by robbo_yobbo
Yea, thats the worst it ever gets for me when I run the tank dry, I run it out on purpose every time so I got an exact measure on my economy. :dj:

I run mine dry cause i'm a tight *** and have no drama's just hit petrol and head for the servo.
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