Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[DESIMUS]

Hey guys recently fitted a full after marker stainless steel exhaust system to my 99 3LTR MV6 AUTO with LPG conversion but its now running very lumpy and backfiring on the gas she runs not too bad on petrol but still not right engine managment light was on so first thing i did was replace the lamda sensors light is now off and it made a difference shes runnin a little better but still not right its like the mixtures all screwed up any ideas welcome.

[Paul M]

Need more details on the LPG system, if it's backfiring I suspect it's a single (or dual) point system rather than sequential injection. Not really the ideal system for this engine, it may need a tune-up to deal with the changed flow characteristics caused by fitting the exhaust. How is it running on petrol? If it's not right on petrol then you're best getting that sorted first otherwise you'll be trying to work around problems that are outwith the scope of the LPG system.

[DESIMUS]

All i can tell you is that the lpg was done from new by a subcontractor for vauxhall i cant rember the name of the company that did it but if someone said it i think i would and its not too bad on the petrol but just dosent seem quite right still a little lumpy

[Paul M]

If it's not running 100% on petrol then get that sorted first, as many LPG systems piggyback on the petrol ECU and sensors, so any problems there will be exacerbated when running on LPG even if there's nothing wrong with the LPG system itself. It may still need a tune-up depending on the system and how adaptive it is.