78 replies to this topic

[pete l]

So. Brand new Bosch lambda and it's still too high. .99% co.
I saw the HC reading and it was 470, if that means anything to anyone.
There are no leaks, I've sprayed easy start all around the inlet and no engine note change.
The old lambda was a bit sooty. The spark plugs are too.
All sensors are new and within spec so what would cause this ???
Anyone ???
Pete.

[pete l]

I've pinched the file line and no change on the emissions, the engine then stalled.

[genpop]

catalytic converters can die as well.Sometimes they are empty.Screw it off at one end and have a look into it, there are pictures on the internet how it should look like.

[Bat]

Hi,

With the HC that high you're running rich, just need to find out why. What are you seeing on lambda voltage with the T4 now?

[cian]

What are the emissions requirements in France?

Uk - for an mpi .3% co
Hc 200ppm

Edited by cian, 16 July 2018 - 07:31 PM.

[tmsmini]

How does the T4 reset operate? With the ACR you can reset the learned values to default values. Has it be driven enough to relearn the new sensor values?

Terry

[pete l]

The cat is in one piece, I had a look through when I put it on.
Cian, I think you'll find that for an moi the limit is around 0.3%
Bat. The lambda on T4 is doing the same thing but it does say it should go up over 2.4v and down below 1v.
Tmsmini. I have deleted all learned values. Not really driven it much, probably about 10 miles in all.

[paulg027]

I hope you have got to the route of the problem.

 

For what it's worth, if your having idle speed issues, it might be worth checking if your MPI has had the Rover factory recall done regarding Rover tech bulletin 0043, an easy modification to do and available through Mini Spares/Mini Sports etc (YMQ105690) but symptoms normally point cooling fan being on continuously, but idle speed also affected.  There are also some easy ways to reduce emissions slightly prior to MOT time and good practice: oil change, oil filter change, air filter change all helps to reduce emissions.

[tmsmini]

You say all the sensors are new, does that include the idle air control valve and its hoses?

 

What about the purge valve, is it functioning properly? If it is open, would it cause a lean condition which might result in the ECU compensating for that?

Edited by tmsmini, 17 July 2018 - 12:48 AM.

[pete l]

The iacv is fine, I have two and both are fine and correctly setup, its currently on 27 steps. There are no air leaks.

What is the purge valve ?????

[Wiggy]

Sure this isn't mechanical? Leaking exhaust valve, or something?

[pete l]

No idea Wiggy. How do I test ?

[Wiggy]

Compression test, or preferably a leakdown test.

[pete l]

What's a leakdown test ?
And where's the purge valve that someone mentioned ?

[Bat]

Hi,

Easy one first, the purge valve is on the triangle reinforcement panel right hand side as you're stood in front of the car looking under the bonnet by the wiper motor. Remove the hose that goes to the engine and plug it up.

A leak down test involves filling each engine cylinder with compresses air and then monitoring the gauge to see if there are any leaks.

Cheers