Rough idle on warm start.

[ainarssems]

That is running rich. Cannot be vacuum leak in intake as that would cause lean running. Most likely bad lambdas or air leak in exhaust near lambdas causing them to have false readings.


Check the extensions of attachments are supported. You might want to zip them and the post here if not supported.

[graynada]

Thanks for the reply.

The exhaust was picked up for a leak on the front (of 3) box although this is not too near the lambda. While we are on the exhaust I only really get it blowing out of one pipe at the back. Could I have a blockage that is upsetting the lambdas, bearing in mind both play up and I have no discernible loss of power?

The files I am trying to up load are of a correct type and well under the 10Mb limit. The error message I get is:

http://forum.a8parts.co.uk/newattach...anageattach&p=

There seems to be a problem on this server.

If loading does not finish properly, please stop the request and re-submit the form.

I could email them if that would help

[ainarssems]

I am sending e-mail in PM, will take a look later as I am leaving house shortly.

[graynada]

Email on its way. Many thanks any help greatly appreciated.

[ainarssems]

I have imported logs in excel and made graphs in the attached file. Click through the sheets to see graphs.

Looks that lambda 1 stops working after the while or gets very lean on that bank.

Bank 2 is running very rich at start, could be that because of blocked exhaust that side is not breathing properly and getting less air in cylinders and because of that bank 1 is getting more then half of the airflow which could result in lean and therefore lambda stops responding in that side.

You need to sort out exhaust first then do another log. Or drop exhaust and do the log without exhaust if you don't feel like spending money before definitely identifying faults.

[graynada]

Thanks for that I think I'm going to need an exhaust anyway so that looks like the best option, get that done and see where we are.

[ainarssems]

There is a good chance one of catalysts have fractured and a piece is blocking exhaust.