LPG Discussion Forum

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bendyone · #1 Post by **bendyone** » Mon Dec 22, 2008 10:46 pm

My Jeep passed it's MOT today without any problems. 75000 miles
Crypton gas analysis
CO level 0.00% (max 0.20)
HC level 8ppm ( max 200)
Lambda 1.01 (max 1.03)
CO level at idle 0.00% (max 0.30)

They said that it was tested running on petrol but with the co levels I thing it must have been on gas.

Active_Lad · #2 Post by **Active_Lad** » Tue Dec 23, 2008 1:26 am

They may have been referring to presentation rather than running. The vehicle must be tested using the fuel on which it is presented, so if you happen to be in Petrol at the time, they should test it on Petrol. But if the system has automatically switched over to Gas during testing, they may actually have inadvertently tested it running on Gas. If you inform the station that it's an LPG conversion and that it's presenting on Gas when you arrive, they should test it as such.

I think it's generally a moot point because if they think you're on petrol and you're on gas, the readings will just come up very lean (but still pass). It's the other way round that you might get a problem.

martin rowe · #3 Post by **martin rowe** » Tue Dec 23, 2008 8:51 am

an LPG converted vehicle does not have a 'catalyst' emission test for MOT, just a basic non cat test ie, CO less than 3.5%, HC less than 1200ppm.

jalfrezigazee · #4 Post by **jalfrezigazee** » Tue Dec 23, 2008 10:37 am

martin rowe wrote:an LPG converted vehicle does not have a 'catalyst' emission test for MOT, just a basic non cat test ie, CO less than 3.5%, HC less than 1200ppm.

thats only if you have the log book changed at the DVLA though as the DVLA computer tells the MOT place what test to carry out so I am told

martin rowe · #5 Post by **martin rowe** » Tue Dec 23, 2008 1:17 pm

Its the tester who inputs the type of fuel for the test, quite right that it is test as presented, so if presenter tells the station its lpg, then it only has a basic emission test. DVLA & VOSA dont seem to work that closly.

Rosanbo · #6 Post by **Rosanbo** » Sat Dec 27, 2008 8:20 pm

Best to present it on LPG (and tell them) because there will be no high revs test done, for the cat, like they do for modern petrol cars.

It never used to be the case that the car had to be DVLA registered as LPG, before they would agree to test it "as presented" for an LPG test. Things may have changed now.