Bad news today
 

Hi all, got bad news today my car went in for its mot and an oil service plus a couple of other job. My mechanic rang me to say the car failed on a number of things the most shocking was the co2 emissions. He had to put in two bottles of cat clean to get it to pass the test and it did just about. He said that it might not pass next time. It is an after market stainless system so do I go back to company I bought it from for there advice, but as it has been 2 years not sure what advice they could give. Plus I have had the car remapped so my gut is saying that it might be the cause of the issue because when I got it done the guy said the fuelling was to rich at the top end so brought it back down BUT I did find I could smell it being really rich on start up when I was using premium fuel so could that have an effect on the cat, but now start to us regular and the smell is much less . I also average 3 hours of driving a day mostly at motorway speeds so the cat gets nice and hot. Where do I go from here?
Many thanks Chris.

Where was it remapped mate Is it a mafless remap
Mick

I have the petrol v6. Even the re map is nearly 2 years old as well.

http://dynamic-ecu-tuning.co.uk/

Used this company.

Well Chris, here are my suggestions:

1. Get your ECM returned to factory settings.
2. Use 95 RON unleaded. The KV6 was designed to run on it so using anything else is a waste of money.

If unburnt fuel has been entering your catalytic converter then you might have to renew it.

Simon

Will a t4 session return the car to factory settings.

Yes the original tune can usually be re-applied using T4 ;)

Russ

Given where you live Charlie, it's a shame I don't still work on Walmgate Road as I could have sorted this out over a cup of coffee..........

However I do know a man who is not a million miles from you who could assist, and if you would like me to pass on your number, drop me a PM ;)

Brian :D

A big thankyou to everyone for your quick and helpful replies. Things were very frosty at home all evening between the miss and myself over the car. At least there is light at the end of the tunnel to save money, before I have to throw more money to fix the problem.

Lets just check some other bits before jumping to conclusions.

Engines run rich on startup so as to combat fuel vaporisation and condensation issues. If it's still rich after a couple of minutes then check for Lambda sensor issues (Sensor 1) , this sensor should adjust the fuel back to Lambda 1. If it doesn't then it could be...

1) Sensor has failed/too old and tired to correct mixture properly
2) There's a combustion issue. An incomplete combustion could read lean (due to excess air in the exhaust gas) so the ECU adds fuel to fix this "lean" problem hence a rich smell.

This post is very interesting to me. My diesel van has been causing horrendous problems over last few months. E m l came on with message “faulty anti pollution”. A diagnostic check revealed faulty Maf, which I replaced, and a leaking injector. I have since had the van to a diesel specialist and had the injectors cleaned and new seals and copper washers fitted. It stopped the leak, but the van still chucks out white smoke on cold start and emits a foul fumey type smell. I am suspecting that the cat has failed,as I had another one of these vans a few years ago,(Citroen Dispatch), but the older shape. I had a load of trouble with that at the end of my ownership, lost power and awful smell. After much investigation and advice from a local garage, I disconnected the cat, and took van for a run, result was it ran normally. Sadly with this van I can’t do that test as the cat comes straight off the manifold and is a one piece exhaust. I have booked van in to the same firm that did the injector work for further tests.