What's my problem? (car is weak)

[mayes]

Hey guys,

I have a VT II that is duel fuel. About 6 months ago it became rather impossible to drive it on petrol, ran really rough...had no power, and could barely reach 60kmph. I didn't have money at the time to fix whatever it was, so i just ran it on LPG since, and it was fine. But now performance has dipped a bit on LPG also... doesn't accelerate as good as it used to, struggles to go 80+ kmph or uphill, and occasionally stalls when at low revs (e.g going into a really slow tight corner under braking)

But now i do have some money, and i want to look into this...

These are the error codes i am getting (driven on LPG):

56: Lean Condition under Load
57: Injector Power supply voltage variation
64: LH Oxygen Sensor Lean
65: LH Oxygen Sensor Rich
76: Air/Fuel ratio variation between left/right banks

Fun facts: car has done about 250,000km, and in the last 6 months i have replaced the oxygen sensors, fuel filter, spark plugs and ignition leads.

Any help, much appreciated. Thanks!

 

[Jxfwsf]

The good news, all those will be linked to the LPG, get the lpg tuned properly as i'm guessing it's been a while.

All will be seen on an out of tune lpg system (all can be seen on a properly tuned system also as the ecu/pcm doesn't control the LPG flow and doesn't get the feedback it's expecting).
56: Lean Condition under Load
57: Injector Power supply voltage variation
64: LH Oxygen Sensor Lean
65: LH Oxygen Sensor Rich
76: Air/Fuel ratio variation between left/right banks

56 will be linked to how the lpg system is installed, the injectors need to be turned off when LPG is selected, it's usually a pain to get deep enough into the loom to cut the power at a good point so most installers cut it at an easy point and the ecu/pcm gets the power to monitor cut in the process, nothing to be to concerned about.

The bad news, I'm going for a dead fuel pump or blocked fuel filter on the petrol issues.

 

[cor3yz]

Getting a lpg service would be a good start. A vapour system like the one I assume you have should be around $77. This will retune the gas mixtures and a professional will notice any faults.
The petrol side of things sounds like the injectors are filthy. When you run on gas all the time the petrol becomes stale and creates a varnish like substance inside the injector rails. This will require a good flushing and Injector reco/clean. Replacing the pump may be necessary too.

 

[mayes]

Okay sweet, thanks guys. Sounds like a LPG service will be a good starting point.

What would the going rate be for replacing fuel pump and/or injectors?