Mot Fail On Emissions

[kenboss53]

I'm in desperate need of some REAL expert advice....

 

1995 Galaxy Aspen 2 litre, 85K miles, full engine rebuild 25K miles ago, recently failed on emissions;

 

Fast Idle Test states:

CO at 2.435 - FAIL, HC at 100 - PASS, Lambda at 0.991 - PASS.

 

MOT station suggests blowing CAT through with air-line to clean out and re-test. Read through some past postings on this forum and was alarmed that someone else with a similar problem had spent about

[ridway]

You've terrified me, similar mileage, and MOT imminent. So much so I've taken a print of your post and give it to my next door neighbour. He's Workshop manager at the local ford dealer. I know you have little faith in the franchise brigade, but maybe the back door approach may bring some suggestions. He says theres plenty of info in your post and he will let me know tommorrow when he's had a chat with the man who operates the diagnostic jobby. He seems to have some confidence in him; he says that he is one of the old school who can relate modern techniques to old methods; fingers crossed.

 

Rich

[charles]

CO reading seems to me extreme high for this engine. check you EMU fault codes with the Ford equipment

[kenboss53]

I have arranged for the mobile diagnostics guy to check the vehicle again. He can't get here until Monday though, so the saga continues....

This all started with a 'cheap' Galaxy with what sounded like noisy tappets. It turned out to be piston slap requiring a recon. engine and now, 6 months later, this nightmare. So much for me and my bargains.... haha

[seatkid]

You shouldnt have changed the Lambda probe in the first instance......

 

Unless I'm mistaken:-

 

Lambda reading of around 1 +- a little is normal and shows that closed loop control is working i.e. Lambda probe is working and correct mixture is being acheived. High CO is then down to faulty CAT.

 

Now you have a new CAT but your Lambda is wrong (and CO is out) - either the new "universal???" Lambda sensor has been damaged fitting the new CAT, or the wiring is damaged or is it simply disconnected?

 

Fitting a Lambda Sensor

 

Torque Setting

  M18 Sensors: 35Nm to 45Nm

  M12 Sensors: 18Nm to 23Nm

 

Do not use an impact wrench or air tools

Avoid twisting or coiling of the lead wire as the sensor screwed in

Remove the protection cap just prior to fitting

Do not expose the sensor to oil, coolant, grease, water etc.

Do not use leaded fuel, silicone or metal based additives

 

Is everything else connected - EGR etc...?

 

Could also be that the ECU has given up trying and is running in limp home mode.

 

Could you refit the old Lambda?

 

How much do these retests costs?

 

Dont worry about 1litre in 2000 miles - it should improve.

 

Rings etc. shouldnt effect CO.

[kenboss53]

mmmmm good point! I'll check the wiring to the new Lambda in the morning (if the rain stops long enough) It may well be that the exhaust guys have damaged the connection when fitting the CAT. Good point, thanks.

The other thing I was wondering; I disconnected the battery when fitting the new Auxillary Air Pump. I read on another thread that the adaptive engine management takes about 50 miles to 're-learn' the system etc. Could this effect the emissions? Just a thought.

[kenboss53]

....forgot to say; have thrown old Lambda away... :)

Presumably if there is a fault with the EGR it will throw up a fault which will be seen by the guy coming out on Monday to re-run the diagnostics? Same with ECU?

Have only had emissions tested when taken for MOT tests. I could check on cost of only checking emissions.

Thanks for your input.

[Guest Martyn]

Hiya,

 

Sorry to be quick on this but i'm just off home from work...

 

This all sounds too familiar to me...had the same problem.

 

See my previos post.

 

Hope it helps?

 

Regards Martyn (2.0L GLX AUTO '96 P)

 

http://www.fordgalaxy.org.uk/Forum/index.p...findpost&p=3682

[kenboss53]

Thanks for the reply Martin. The part you refer to is the Auxillary Air Pump which I have already replaced at a cost of

[Guest Martyn]

<_< Glad you got it sorted !!

 

Regards,

 

Martyn