'01 Clio 1.2 16v LPG
Hi all, thanks in advance for your help.
I have a 2001 1.2 16v Clio which has a Prinns LPG conversion. It runs okay on both petrol and LPG, I think it is a bit down on power top end when on petrol, but fine on LPG. However it only returns 30mpg. Doesn't matter if I am doing 70mph on the motorway, 50mph on a single carriageway or town driving at rush hour or if I use petrol or LPG.
I have searched the forum and many people are saying that the coolant temp sensor could be at fault, or a lambda sensor. I have had my usual garage check these out, and the coolant sensor reads fine, as does the precat lambda, but they said the post cat lambda is giving unusual readings. They have said this is unlikely to be the cause of the poor economy, is that correct?
Unfortunately they are EXTREMELY anti LPG, as such, they have advised me that the LPG system is faulty and interfering with the readings from the lambda sensor :S or the valves have burnt out, and I am loosing compression through the exhaust valves.
After some help really on where to start? Just so you all know the car is serviced every 10k miles by me with 5w30 fully synthetic oil, just had new air filter, spark plugs and coil pack. The cat does have a metallic rattle from inside it, but there were no issues with the emissions at MOT nor is there any management lights on the dash. The car is running on Continental EcoContact tyres all round which are only 1000 miles old and set at 34 front and 32 back.
Could the post lambda sensor be causing the issue?
Should I test or change the coolant temp sensor anyway?
Anything else it could be?
I have a 2001 1.2 16v Clio which has a Prinns LPG conversion. It runs okay on both petrol and LPG, I think it is a bit down on power top end when on petrol, but fine on LPG. However it only returns 30mpg. Doesn't matter if I am doing 70mph on the motorway, 50mph on a single carriageway or town driving at rush hour or if I use petrol or LPG.
I have searched the forum and many people are saying that the coolant temp sensor could be at fault, or a lambda sensor. I have had my usual garage check these out, and the coolant sensor reads fine, as does the precat lambda, but they said the post cat lambda is giving unusual readings. They have said this is unlikely to be the cause of the poor economy, is that correct?
Unfortunately they are EXTREMELY anti LPG, as such, they have advised me that the LPG system is faulty and interfering with the readings from the lambda sensor :S or the valves have burnt out, and I am loosing compression through the exhaust valves.
After some help really on where to start? Just so you all know the car is serviced every 10k miles by me with 5w30 fully synthetic oil, just had new air filter, spark plugs and coil pack. The cat does have a metallic rattle from inside it, but there were no issues with the emissions at MOT nor is there any management lights on the dash. The car is running on Continental EcoContact tyres all round which are only 1000 miles old and set at 34 front and 32 back.
Could the post lambda sensor be causing the issue?
Should I test or change the coolant temp sensor anyway?
Anything else it could be?
