High Emissions?

[markley]

Can anybody advise what may need doing to clear my high emissions causing failure on MOT please.
I have a petrol/lpg bongo 1996 model. It seems to be running okay otherwise.
Any advice welcome

[Simon Jones]

Can you let us know what figures are? The emissions test covers a number of parameters, any of which can be too high (or too low).

[rita]

Can you let us know what figures are? The emissions test covers a number of parameters, any of which can be too high (or too low).

I think the clue is in the title..

"High Emissions"

[rita]

markley ,what fuel was the engine running at the time of the test.?

[mikeonb4c]

Can you let us know what figures are? The emissions test covers a number of parameters, any of which can be too high (or too low).

I think the clue is in the title..

"High Emissions"

Is it? Ya got me there Rita

[New Forest Terrier]

No great scientific understanding understanding of this but on the 2013 MOT my V6 with LPG, initially failed on emissions on LPG. A total shock because the emissions had always been fine. I took it back to the LPG installers. They tested it on their machine found the emissions fine, but gave it a tune up anyway. I took it back to the MOT test station and they claimed it had failed again on LPG but had just squeaked through when the turned it over to petrol. Various dire warnings about this being its last MOT pass as it deteriorated so much.

For the 2014 MOT I took it to a Bongo friendly garage. I had done nothing to it in the year, apart from an oil change. I just wanted details of what seemed an inevitable failure. It went straight through with no emissions problems. According to the LPG installer there is apparently a trick to getting a petrol Bongo past its emissions test especially the earlier ones. The Lambda kicks in with a delay after it appears to be at the correct temperature. You wait and the emissions will suddenly drop. At that point it is ready to test. The LPG place knew that and so did the Bongo friendly place where it had been tested more recently. The other MOT station got a pass by luck as they were testing too soon. The final pass being on petrol simply meant it was changed from LPG at the point the emissions were about to fall. Changing the Lambda does not speed things up.

The only other possibility was that the testing machine had not been set up correctly the one time.

[New Forest Terrier]

http://www.igmaynard.co.uk/bongo/forum/ ... =3&t=67824

Look at this thread on the same problem. Find a Bongo friendly garage for a re test. They just do not perform like a modern car. Quirky like all Bongo's. Mine is a 95 so would be similar to your 96.

[Simon Jones]

Can you let us know what figures are? The emissions test covers a number of parameters, any of which can be too high (or too low).

I think the clue is in the title..

"High Emissions"

As you seem to be in the know, perhaps you could let us all know whether it failed on CO, HC or Lambda? The causes of any of those being high will be very different.