CCCMikey
Active Member
- Joined
- Oct 17, 2009
- Messages
- 244
- Reaction score
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- Location
- Black Mountain NSW
- Members Ride
- VS '95. LPG. 513,000KM
G'day all 
Recently I've had issues with seeming to 'lose all power' for about 1/4 of a second now and then, only on LPG. It's quite sudden when it happens, as if the ignition had been turned off briefly, and causes a fair shudder going from cruising to nothing to cruising in that brief period. So I've stopped using LPG for now.
I've fired up TunerPro RT to have a look at what's happening when I switch to LPG. This might not be a very accurate test as I did it fairly quickly before needing to head out. Looking back at the logs tonight, two things seem to stand out.
One is that the LH oxygen sensor (Green) lags well behind the RH oxygen sensor (Blue). I'm assuming they should be about the same?
The other is that both sensors crash down heavily I think once I enable LPG. (Enabled by hand over 1400rpm.) There was a low pressure warning logged in the LPG computer's diagnostics section as well. I think that means it'd be running fairly lean. Possibly the filter needs changing (not done in ten years) or the pressure reducing gadget that heats the LPG is due for a service.
Any thoughts on this? It's at 532,000km now and I've never changed any sensors etc since I've owned it at 180,000. I'm thinking it's so lean that it might just fail to spark briefly, but I am also thinking because it's so sudden that it might be electrical in nature. I'd need to do a rolling test I think (not parked) to see if I can capture an event; but don't want to blow anything up either!
I probably should also mention that at idle there's a repetitive slight chuffing sound from the exhaust, so perhaps a valve isn't terribly healthy. The whole thing is getting a bit old!
Recently I've had issues with seeming to 'lose all power' for about 1/4 of a second now and then, only on LPG. It's quite sudden when it happens, as if the ignition had been turned off briefly, and causes a fair shudder going from cruising to nothing to cruising in that brief period. So I've stopped using LPG for now.
I've fired up TunerPro RT to have a look at what's happening when I switch to LPG. This might not be a very accurate test as I did it fairly quickly before needing to head out. Looking back at the logs tonight, two things seem to stand out.
One is that the LH oxygen sensor (Green) lags well behind the RH oxygen sensor (Blue). I'm assuming they should be about the same?
The other is that both sensors crash down heavily I think once I enable LPG. (Enabled by hand over 1400rpm.) There was a low pressure warning logged in the LPG computer's diagnostics section as well. I think that means it'd be running fairly lean. Possibly the filter needs changing (not done in ten years) or the pressure reducing gadget that heats the LPG is due for a service.
Any thoughts on this? It's at 532,000km now and I've never changed any sensors etc since I've owned it at 180,000. I'm thinking it's so lean that it might just fail to spark briefly, but I am also thinking because it's so sudden that it might be electrical in nature. I'd need to do a rolling test I think (not parked) to see if I can capture an event; but don't want to blow anything up either!
I probably should also mention that at idle there's a repetitive slight chuffing sound from the exhaust, so perhaps a valve isn't terribly healthy. The whole thing is getting a bit old!
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