Maybe things are running now because it is warmer. Lpg will litterely freeze in the tank when winter and your pulling fuel. Also a little water/ice in the gas will mess it up. Also sometimes the wrong grade of LPG is pumped. If it isn't showing any misfires this is good. Explore your code reader, when the truck runs good compared to when it is bad. Document your PID's so you can compare them. Vacuum is the number one problem on most, along with the VCT's.

 

Hmm, I traveled 500kms with the truck but no problems whatsoever. Only difference is that I drived on flat roads, not in the mountains anymore.

Trouble codes + freeze frame after ful reset and this trip:
DTC: http://dl.dropbox.com/u/11020819/Fault2.txt
Freeze Frame: http://dl.dropbox.com/u/11020819/freeze%202.txt

I don't get it anymore.. The truck used to shudder and was sometimes very rough.. now it's perfect. Maybe fuel or temperature related like you said.

 

It's good to hear you are running ok now. Look to freeze up of vacuum or fuel next winter. Also air pressure drops with altitude and engine power fuel mixture changes. At sea level 14.7PSI at 5000' elavation 12 psi. Compression also drops. This will bring about huge losses in power under LPG. Check off road for 4x4 problem at engagement grinding. That would point to vacuum control problems or slight/major misalignment due to the accident? Maybe a hub grobbled out.

 

Hmm, only thing I didn't tested was cruising at high speeds. When crusing at 60mph, no problems, but from 70+ it looses power... Accelerating from 70 to 80 was very hard according to my dad. Will test it soon on both LPG and gas...

 

x2 It's good to read your running okay now

 

Lpg systems used to offer different springs to compensate for different altitudes. The system is atmospherically controlled so the air pressure would effect the fuel mixture on fuel mixer systems. Now it is internally adjusted by the puter. You have an atmospheric PSI sensor. Look to its pid at different elevations to see if it is accurate.

 

Here in the Netherlands I'm at sealevel, when I travel abroad I'm maybe 300-400mtr above sea level. Does that couple of meters really matter? I have travelled a lot of times before, always good, but since Januar it's bad like this.

It hasn't happened since I'm back by the way. But I don;t trust this truck. Now everything is perfect, it accelerates like a rocket... but what if I travel abroad again? It's totally random, totally random. No nasty OBD codes yet since the ecu reset.

Maybe try to change the transmission fluid? Is that something I can do by myself (hehe, I have to, because there aren't any american dealerships in the neighbourhood :P )

 

You will need to order a drain plug kit for the pan. Pull the pan and filter, instal the kit and then you can drain it again in a few months without the expensive flush.