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[pigtown]

The diagnostic by the MOT station said change both lambdas at £400 to fix it. I did (not at £400) and it didn't. that was Nationwide (now halfords)!

Changed the MAF and the car is running much better on petrol BUT it still failed emissions.
Lambda is ok now 1.01 but CO level now high 0.7% (limit 0.3%)  (This was 0.01% when the lambda wasn't working)!
Other gases are:
HC 119ppm, CO2 13.83%, O2 0.82%

Could this be a dead cat as per Lazy Docker?

[pigtown]

Anyone experience of the Cats on ebay for £120?

[RobG]

PM Daz http://www.omegaowners.com/forum/YaBB.pl?num=1298493103

[Bent valve]

Replacing parts on a hunch will only cost money, and wont resolve the issue.

It will eventually, and he might get lucky and replace the right part first time

[Kevin Wood]

A mixer setup will never keep a more sophisticated petrol ECU happy by directly using the Lambda sensor outputs to control LPG mixture. I'm guessing the LPG fuelling has been out for some time and this has perhaps killed the Lambda sensor and cat.

In addition, it results in silly values in the block learn tables of the ECU meaning running on petrol is then affected.

I would run it exclusively on petrol until after it has passed the test.

With the Lambda value at the exhaust gas now somewhere near correct another italian tune-up might wake the cat up (I would say a fast motorway / main road cruise is the most effective way to wake a cat up). Failing that a second hand one from a breaker is probably the best route as aftermarket ones tend to be poor quality.

Beware the new cat might go the same way if the main problem is not addressed, but it does require further diagnosis to be sure what's going on. Get it through the test on petrol and then, once it's back on the road, we need to take a look at the live data and see what's going on.

Kevin

[pigtown]

Thanks for the late night (early morning) reply Kevin!

I did give it another Italian tune up before getting it retested but the CO level was high (it was ok before the MAF change but was running very weak). I have ordered an aftermarket cat from Europarts for just under £200 (Ouch)! Due for delivery tomorrow. I need to change it quickly as I have been using my sister's car and she's getting a bit p****d off being without a car!

As you say it has probably been out for a while and that may have killed the cat. It has been lumpy on petrol start up for a long time now and it appears the MAF has cured that and also brought the lambda values in. I didn't do anything about it before as it ran good on lpg.
Can the block learn values be reset by disconnecting the battery? That might give a better starting value than the existing.

Once it's through the MOT and legal perhaps we can arrange a time when you can take a look?  I work in Newbury so not so far to get to you from there.