27 replies to this topic

[miniboy1971]

Thanks for joining the debate Sprocket !!

I've already re-sealed the join at the back box to cat pipe, so I'll have a closer look either side of the CAT and then the Y-piece....

If these are all ok, would it be worthwhile doing the diagnostics to check on the lambda and the rest of the set up ?

What would cause the engine to run lean ?

Cheers.

[Sprocket]

Test the lambda sensor is working before you do anything else after you seal any leaks in the exhaust.

[miniboy1971]

OK will do - thanks again.

[syholl]

The S-works kit only uses the standard air filter and the one that's in there has only done about 1500 miles, but I can change this no problem.

Are you absolutely sure, i had one, and it definitely had a K&N filter in place of the standard one...

[miniboy1971]

Yep certain.

I'd put a K&N filter in the casing before the conversion and they gave the K&N back to me when they swapped the filter box and put the standard one back in.

I've just checked the old JCG brochure that I've got for the S-works kit and its not listed as one of the parts.

[sirweste]

The K&N filter element is one of the parts the coopers fitted as part fo the conversion.

I have only failed emmissions once, and it was the one time i didnt take the car out and leather it for 30minutes before the test!

[miniboy1971]

The K&N filter element is one of the parts the coopers fitted as part fo the conversion.

I have only failed emmissions once, and it was the one time i didnt take the car out and leather it for 30minutes before the test!

The K&N wasn't fitted in mine, they actually took my K&N out and swapped it for a standard filter. The K&N is not listed as part of the S-works kit, but that's not to say things didn't change after mine was done.

[sirweste]

I have found that not everything they did is on the invoice to be honest. Fairly sure that (at least for the MPi's) the filter element was a "kit" part, used to be in the picture of all the kit parts on their website

[Portugal]

To Sprocket (the wise one)

I've went for the MOT and failed on the emissions.

But I've finally got the proper readings:

The first reading, the test guy revved the hell out of the engine just before, to try to lower the CO reading which was alot higher!
rpm: 0900
CO: 1,97
CO2: 14,1
O2: 0,05
HC: 0358
Lambda: 0,935

Second reading
rpm: 3250
CO: 3,57
CO2: 13,1
O2: 0,00
HC: 0299
Lambda: 0,893

I've looked at the Emission Failure diagram you pinned, but I'm still not 100% sure.
The symptoms are rich mixture with misfire on one cylinder.
Do I need to replace O2 sensors?
Does the above reading give a more clear answer?

Let me know, cheers Portugal

[Boycie]

I'm betting on a slight exhaust leak here, totally agree with Sprocket- there is no CAT problem with those readings...

Also, the air filter is not the problem.


EDIT- I'm obviously going mad.. CAT removes, what 3% CO? So those fast idle readings indicate it's not doing much..

Just noticed you say it has a misfire- you've gotta sort that first, it'll never get through on 3 pots! Look at plug/ coil pack etc.

Edited by Boycie, 07 March 2009 - 08:44 AM.

[Sprocket]

To Sprocket (the wise one)

I've went for the MOT and failed on the emissions.

But I've finally got the proper readings:

The first reading, the test guy revved the hell out of the engine just before, to try to lower the CO reading which was alot higher!
rpm: 0900
CO: 1,97
CO2: 14,1
O2: 0,05
HC: 0358
Lambda: 0,935

Second reading
rpm: 3250
CO: 3,57
CO2: 13,1
O2: 0,00
HC: 0299
Lambda: 0,893

I've looked at the Emission Failure diagram you pinned, but I'm still not 100% sure.
The symptoms are rich mixture with misfire on one cylinder.
Do I need to replace O2 sensors?
Does the above reading give a more clear answer?

Let me know, cheers Portugal

Does the car have a cat?

[Portugal]

Does the car have a cat?
[/quote]

Yes, it's got a cat.
It's 99 S works.
I check the exhaust over the weekend for leaks and seems OK?

[cambiker71]

Quick note to the mods
Can this topic be seperated as people are now getting confused and answering the wrong person due to the topic having been hijacked. Please people start a new topic if you have a problem, or PM the person you want advice from.

Miniboy1971,
It sounds as if the cat is fine but it's either (as already mentioned) an exhaust leak or the fuelling is too weak, which could be the lambda sensor playing up or something as simple as a very slight inlet leak, eg a vacuum pipe splitting.

Portugal
You first need to sort the misfire, the readings indicate the cat is doing nothing, and i suspect it will need replacement, but before you do, i have seen the emissions come into line when the engine has been retuned to run properly. Get it running properly first.