BXProject

Post by **Vanny** » 29 Feb 2008

got a little bored earlier so nipped to the nice MOT man (the one i wouldn't trust with a barge pole) and had him run an emmisions test on the valver (and yes the machine was on and heated up), with results as follows;

IDLE

Hydrocarbons - 94ppm
Carbon MONoxide - 2.49%
Carbon DIoxide - 11.76%
Oxygen - 2.61%
lambda - 1.039

2000 RPM

Hydrocarbons - 252ppm
Carbon MONoxide - 0.39%
Carbon DIoxide - 13.97%
Oxygen - 1.39%
lambda - 1.051

Target IDLE

Hydrocarbons - <100ppm
Carbon MONoxide - 0.8 < 1.5%
Carbon DIoxide - >13.0%
Oxygen - ??
lambda - 1

so, well it would pass an MOT, but i'm a little worried about the high CO2 on idle (suspect an issue with the exhaust manifold) and now i want the injectors tested and reconned and might set about the spare AFM with a scope and get it calibrated right up and see how that goes down.

I actually have two emisions testers of my own, neither of whcih actually work which sucks!

Philhod · Post by **Philhod** » 29 Feb 2008

What`s wrong with the CO2

Looks ok to me ............

CO reading is a bit high though

How many miles has it done since a rebuild

Those readings spell not quite warmed up enough... if the motor`s done a few miles

Post by **Vanny** » 29 Feb 2008

sorry meant CO rather than CO2

engine was rebuilt by chris in the summer (do you not bother to read naything on this here forum, or even the website), possibly getting on for 7500miles, certainly not a hell of a lot as i cant afford to run it at the moment. Try only to go on 20minute minimum runs, and id had an oil change 200 miles ago.

At the time of the test the engine had been running for over a half hour (in town) and as i drove into the test back the fans where on full chat so i'd say it was plenty warmed up.

I do believe there might be a leak between exhaust manifold and the downpipe though. I'd like to say its not down on performance or ought but i wouldn't know what it should be!

docchevron132 · Post by **docchevron132** » 01 Mar 2008

A high CO but normal CO2 and fair lambda would tend to indicate a leak on the exhaust side of things.

The first of the TU engines with oxygen sensors are renowned for failing MoT's on emissions (high CO). It's rarely a problem with the sensor itself, but the welded joint around the thread for the sensor that cracks.

I know your car hasn't got a pussy, but the same applies..

Philhod · Post by **Philhod** » 01 Mar 2008

Vanny wrote:- Doc rebuilt it last summer.........

Do you not bother to read naything? on this here forum......

ERR .............well....I only joined in November....

And yes, having completed so little of your liverpool miles....I fully concurr with Doc.

Never welded any Lambda bosses though.

petrol engines!!!

Post by **Vanny** » 01 Mar 2008

well i know that feeling, i'm desperate to get back in a diesel, there much more satisfying than a petrol!

Shame they don't do weld in smog sensors

David · Post by **David** » 01 Mar 2008

2.5% CO isn't that high tbh. All you need to do is tweak the AFM a touch (16v uses a flap-type airflow sensor doesn't it?) and it'll be fine.

if it was 4% then I'd be concerned. Likewise if it was 0.5% that would be too low.

Looking at your 2000rpm reading, that looks suspiciously lean. I'd always want to see the Lambda reading at 0.95 rather than 1.05 and the CO at 2% rather than 0.2% to ensure longevity from the engine and no flat-spots.

Slightly rich mixture is always preferable to slightly lean, and doesn't necessarily mean you'll get any worse fuel economy. In fact, if your mixure is too lean (and Lambda at 1.05 suggests it might be) you may be loosing a few MPG.

Philhod · Post by **Philhod** » 02 Mar 2008

Er ....where were you this pm David I thought you were coming up! Vanny is stopping over at mat`s, as is Smiffy I think the Doc is leaving somewhere in the early hours.
I took my son in law, Derek and my grandson Liam, so had a driver and we just got back about an hour ago as Dek is working tonight.We had a good afternoon yakking, followed by a chinese and several liquid refreshments

We`ll probably meet later in the year as I am determined to get to one of the "events" this year.

docchevron132 · Post by **docchevron132** » 03 Mar 2008

Vanny wrote:well i know that feeling, i'm desperate to get back in a diesel, there much more satisfying than a petrol!

Diesel more staifying than a valver?????

Have you gone quite mad?

So does this mean Jazz will be returned once more to the Turbo of D variety??

smiffy · Post by **smiffy** » 03 Mar 2008

docchevron1472 wrote:
Vanny wrote:well i know that feeling, i'm desperate to get back in a diesel, there much more satisfying than a petrol!

Diesel more staifying than a valver?????

Have you gone quite mad?

Actually, I prefer the turbo D I've just bought to the 16v....it feels nicer, and more relaxing to drive!

docchevron132 · Post by **docchevron132** » 03 Mar 2008

I have both of course.
And whilst I love the TD like a child, I miss the valver so much it actually hurts a bit.
Yes it's loud, aggresive, expensive to run, firm, tempramental yadda yadda yadda, but it's just....... I duno, it's just great.
A 16V to me will always have an edge over any other BX, that said, I'd never get shot of the TD, and I'd sell the valver before the TD went anywhere but thats got nothing to do with the engine in it and more to do with the history I have with that car.
Maybe oneday TFB will have a 16V engine in it aswell...

cough, cough