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[wayneywoo]

I've still got my original downpipes and cat up the shed.  Replaced due to the flexi pipe splitting.

I noticed with the patent part that the two bolt holes on the downpipes don't line up properly and I'm curious if the original cat will make a difference.  The replacement is quite a bit smaller?

But, to re-use the original cat, I need to replace the 9" or so flexi pipe.  Does anyone know where this flexi pipe could be bought?  I've seen on ebay but not too sure.  Off the shelf from anywhere?  I'm in Hemel Hempstead, HP3.

[Welung666]

You can buy the flexi section on eGay, you'd need a 51mm diameter and 100mm long. Just get it welded in to replace the old one. I'd do it for you as I've done a few but it's a long way to come for a bit of welding.

[wayneywoo]

You can buy the flexi section on eGay, you'd need a 51mm diameter and 100mm long. Just get it welded in to replace the old one. I'd do it for you as I've done a few but it's a long way to come for a bit of welding.

Thanks for the offer guy!  I wouldn't want you to travel all that way.

Can jubilee clips not be used at either end with a section that is slightly oversized?

[wayneywoo]

UPDATE:

Removed the throttle body and gave it a good clean along with the IACV.  Plenty of carbon build up.

Also cleaned the breather jet.  This was completely blocked.

Just need to order the gaskets for the IACV to throttle body and throttle body to inlet.

Can't wait to put it all back together but I'm still not sure how this will affect the emissions other than maybe idle?

I've seen a few posts on the 'net and when they have complained of emissions, it's been a new cat that's fixed it.  That's why I'm keen to get the original cat back on!

Has anyone else had good results regarding emissions just but cleaning the various parts and pipes? 

[wayneywoo]

Is it well serviced, breathers nice and clean, throttle boy clean etc?

hmmm......not sure Mark 

It will occasionally stall at idle...

There is your starting point then 

Guides in the maintenance section?

Yes:

Throttle body:

http://www.omegaowners.com/forum/YaBB.pl?num=1207387811

The other bits

http://www.omegaowners.com/forum/YaBB.pl?num=1194007453

Do both, its pointless just cleaning the ICV

Well, after putting it all back together, the idle is nice and smooth and all seems ok (not sure compared to before but anyway).

Will now get the emissions re-checked.

BTW....I didn't have any error codes and thought, just to check all was ok, I took off the air temp sensor plug and ran the car.  Re-checked with the paperclip and now I get error code 0110 which apparently is "Air Temp Voltage High" so I can presume all was ok before.

Question, how can I clear the error codes.  I did have a code before pointing to a faulty O2 sensor.  That code must've cleared itself over time (having replaced the sensor!)?  Did I read correctly that twenty ignition turn on's clears any error codes?

Thanks for all the valuable input guys!

[wayneywoo]

Help 

Just been to get the emissions checked (this time I replaced the air filter, left it out the first time)...

Fast Idle Test:

CO  - 0.717 (Higher than first time?)
HC  - 147
Lambda 1.015

Second Fast Idle Test:

CO  - 0.518
HC  - 192 (200 fail! few times went above 200!)
Lambda 1.013

Natural Idle

0.577 (.5 pass)

The testers opinion was a new cat.

Does the lambda at around 1 mean that the mixture is at the ideal (stoichometric or what ever it is) and so whats coming out the engine is fine, just the cat isn't converting enough CO?

Blast....blast.....blast!!!

[henryd]

mot lambda spec is 0.97-1.03 but 1.00 is ideally where it should be.I see that you have replaced the 02 sensor but with what make ?,I have had many problems over the years with fuel parts 02 sensors and generally find genuine or ngk are the best

[wayneywoo]

mot lambda spec is 0.97-1.03 but 1.00 is ideally where it should be.I see that you have replaced the 02 sensor but with what make ?,I have had many problems over the years with fuel parts 02 sensors and generally find genuine or ngk are the best

Hey Henry,

Both the Lambda sensor and the cat/downpipes were changed just over two years ago.  The lambda I got from AutoVaux and the cat/downpipes from a local motorfactors.

I've read elsewhere some guy who had a Vectra with the X20XEV engine and his CO emissions went down from around 0.7 to 0.005 with a new cat.  Is it this simple (and expensive  :-/)

[mantagte]

changed my cat last month due to high emissions
got cat from http://www.buypartsby.co.uk/catalytic-converter-buy.php
retested car emissions were perfect

[henryd]

was the car really well warmed up prior to the test as I see that your second fast idle test is quite a bit better than the first

[wayneywoo]

changed my cat last month due to high emissions
got cat from http://www.buypartsby.co.uk/catalytic-converter-buy.php
retested car emissions were perfect

This *seems* the way forward...

was the car really well warmed up prior to the test as I see that your second fast idle test is quite a bit better than the first

I gave the car a good blast up the motorway before going to the testing station.  Admittedly, the car sat with the engine off for a good few minutes before being tested...

I can see the CO is considerably lower on the second test but the HC are way high, higher than the first test.  Would me re-fitting the air filter do this as the first test, I removed the air filter completely.