Nct emissions help!

Liamofitz18

Have a 05 mk2 focus failed emissions 3 times on high idle co's firs time it was 0.23 with a vacumme leak second time was 0.31 and third time was 0.30 the 3rd time i done an engine flush changed the oil and filter.plugs.air filter.leads.coilpack.fixed a vacumme leak.diptain.fresh fuel and still failed also got the exhaust checked theres no leaks or blows. Its a 05 mk2 ford focus 194k on the clock. Its has me at my whits end any advice greatly appreciated.
Thanks in advance

George Dalton

Post the rest of the emissions readings. Especially the lambda at high idle.

Liamofitz18

George Dalton wrote: »

Post the rest of the emissions readings. Especially the lambda at high idle.

Ill do it in a bit just on the way to work now 😂

Liamofitz18

Is there a way off posting up a picture off the sheet ?

Liamofitz18

If not heres the result:

High idle lambda 1.01
High idle (3,200 rpm) CO 0.30 vol%
HC 102ppm
Engine oil temp 89

George Dalton

It needs a cat I would say.

Liamofitz18

Ill go hunting for a cat so haha. Would the lambda be nackered aswell? A friend failed emissions twice even with a good cat and changed his lambda and it passed

Liamofitz18

Also when it had a vacumme leak the first time i put it through the co's were 0.23 den fixed the leak and they went up haha. Seems weird to me and would the rad fan always on cause emissions problems ?

George Dalton

The vacuum leak would have caused it to run lean hence the lower CO figure. Then once you fixed the leak the lambda came into spec but the CO increased due to the slightly richer mixture.

There’s nothing wrong with the lambda sensor. It looks like a straightforward case of needing a cat.

Liamofitz18

Ill try get a cat would welding in a second cat do the same job cant find a normal bolt in 1 for my budget

Liamofitz18

!!! Just a quick update !!!

I got a brand new cat welded in and put it back through the nct and it failed on emissions again they have gone up 🙠there now: co 0.46 vol% at high idle. Anybody any insight on this at all as its wrecking my head 😑 was told could be a faulty coolant temp sensor and its causing the car to run rich because it cant tell the cars brain that its warmed up ?