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NOT fail on emissions #667112
14/10/20 11:06 AM
14/10/20 11:06 AM
Joined: Sep 2016
Posts: 694
Chester, UK
Grumpy2 Offline OP
Talk Morgan Regular
Grumpy2  Offline OP
Talk Morgan Regular

Joined: Sep 2016
Posts: 694
Chester, UK
Well it failed! Tester thinks it’s the MAF. Both CATs read the same so likely to be inlet side.

Is MAF adjustable/cleanable/ replicable

94 plus 8 3.9 Efi

All help gratefully received

Thanks

[Linked Image]


94 plus 8 in Westminster Green - I think!
Re: NOT fail on emissions [Re: Grumpy2] #667115
14/10/20 11:19 AM
14/10/20 11:19 AM
Joined: Feb 2010
Posts: 1,084
SimonH Offline
Has a lot to Say!
SimonH  Offline
Has a lot to Say!

Joined: Feb 2010
Posts: 1,084
Speak to John Eales
J E Developments
01455 202 909


Simon @ Sifab.co.uk

Sifabtemporary@gmail.com
Re: NOT fail on emissions [Re: Grumpy2] #667118
14/10/20 11:48 AM
14/10/20 11:48 AM
Joined: Sep 2014
Posts: 1,855
London
MOG 615 Offline
Talk Morgan Enthusiast
MOG 615  Offline
Talk Morgan Enthusiast

Joined: Sep 2014
Posts: 1,855
London
I do have a spare AMS/MAF which you are welcome to "borrow" if nothing else can be found. It is untested so there is some risk , but I purchased it as a spare a few years ago. However I am away from this weekend for a week , so won't be able to help much after tomorrow.

Last edited by MOG 615; 14/10/20 11:51 AM.

Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
Re: NOT fail on emissions [Re: Grumpy2] #667140
14/10/20 03:08 PM
14/10/20 03:08 PM
Joined: Dec 2017
Posts: 1,114
Evergreen, Colorado, USA
britmog Offline
Has a lot to Say!
britmog  Offline
Has a lot to Say!

Joined: Dec 2017
Posts: 1,114
Evergreen, Colorado, USA
Years ago when living in California my 94 +8 failed the SMOG check, I cleaned the MAF with a sensor spray cleaner bought off the shelf from the local auto store. Worked a treat as it passed the next day and for ever more!!!!


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: NOT fail on emissions [Re: Grumpy2] #667165
14/10/20 04:41 PM
14/10/20 04:41 PM
Joined: Jul 2011
Posts: 717
I
IcePack Offline
Talk Morgan Regular
IcePack  Offline
Talk Morgan Regular
I

Joined: Jul 2011
Posts: 717
Assume it is the Max Lambda. Just confirm they are using max allowed 1.05 as per Driver & Vehicle Standards Agency In service exhaust emission standards for road vehicles (eighteenth edition ?).
I have noted that most MOT stations use a max of 1.03 for my 4/4, but the above publication quotes 1.05, the same as the V8s.
If you note the same, you can download the publication from Gov Website. Sorry don't have the link, but that is where I got my copy. The copy always goes to the MOT station, just in case. On Monday my 4/4 passed but at 1.03, so OK.
Oh Lower is quoted as Min 0.9


4/4 Ivory 4.1:1 axle, Jaguar XE R-Sport.
Re: NOT fail on emissions [Re: Grumpy2] #667175
14/10/20 05:31 PM
14/10/20 05:31 PM
Joined: Aug 2013
Posts: 13,865
Salisbury, UK
Peter J Offline
Formerly known as Aldermog
Peter J  Offline
Formerly known as Aldermog
Member of the Inner Circle

Joined: Aug 2013
Posts: 13,865
Salisbury, UK
I had a similar problem with the Roadster.
In the end I had to buy a new Ford air flow sensor, cleaning didn't help.
Once the new one had been fitted I had a close look at the old one. They work, I understand, by measuring the temperature drop across the heated wire caused by the air flow. The old one had what seemed to be almost glazed on gunge at the two ends which I think acted like an insulator.

The BMW V8 in the Plus 8, at the same age must use a different way of measuring air flow, the MOT results last year gave a Lambda of 1.006, the max limit shown is 1.03, as mentioned above.
So why don't they use 1.05 if that is in the D&VSA documents?
A perfect Lambda result is 1.000.

The CO was 0.03 %, limit is 0.2%
Hydrocarbons 12ppm, the limit is 200ppm.

So the engine seems to work as designed.


Peter,
V8s are best....
Tarka the 'Otter Mog....2014 Plus 8
AMG C63 Estate.


Re: NOT fail on emissions [Re: Grumpy2] #667180
14/10/20 05:49 PM
14/10/20 05:49 PM
Joined: Sep 2016
Posts: 694
Chester, UK
Grumpy2 Offline OP
Talk Morgan Regular
Grumpy2  Offline OP
Talk Morgan Regular

Joined: Sep 2016
Posts: 694
Chester, UK
Thanks all for the above. I’m going to have a look tonight.

JE tried to help but were not too successful

There are some replacements available for Range Rover 3.9s for not too much money on eBay (£80), but they may or may not help

I understand it’s possible to adjust something with a screwdriver but without an emissions meter it’s not easy to know if that does anything or not.

Think I’ll clean it and see if that helps, my MOT guy is pretty good and ‘gets’ older cars

Get the Morgan vibes come in my way....—__—__—__

Thanks chaps


94 plus 8 in Westminster Green - I think!
Re: NOT fail on emissions [Re: Grumpy2] #667196
14/10/20 07:07 PM
14/10/20 07:07 PM
Joined: Feb 2010
Posts: 1,084
SimonH Offline
Has a lot to Say!
SimonH  Offline
Has a lot to Say!

Joined: Feb 2010
Posts: 1,084
What’s it actually failed on?
Some numbers would help please


Simon @ Sifab.co.uk

Sifabtemporary@gmail.com
Re: NOT fail on emissions [Re: Grumpy2] #667199
14/10/20 07:29 PM
14/10/20 07:29 PM
Joined: Sep 2016
Posts: 694
Chester, UK
Grumpy2 Offline OP
Talk Morgan Regular
Grumpy2  Offline OP
Talk Morgan Regular

Joined: Sep 2016
Posts: 694
Chester, UK
Here’s some photos hopefully.

One shows the fail sheet

Another is what I believe is the tiny Hotwire that can be cleaned

The third is some sort of adjustment screw. Chap at JE (not John) said turning his ‘might’ alter the emissions

[Linked Image]
[Linked Image]
[Linked Image]


94 plus 8 in Westminster Green - I think!
Re: NOT fail on emissions [Re: Grumpy2] #667214
14/10/20 09:08 PM
14/10/20 09:08 PM
Joined: Oct 2007
Posts: 243
Sandhurst, Berks
T
teknome Offline
L - Learner Plates On
teknome  Offline
L - Learner Plates On
T

Joined: Oct 2007
Posts: 243
Sandhurst, Berks
There are specific emission levels for the 3.9 Plus 8 - Lambda is 0.9 to 1.05 , idle CO is 0.5 , fast idle CO is 0.3, HC is 200
These are listed in the 'In Service Exhaust Emission Standards for Road Vehicles'
For some reason the exhaust emission analysers don't seem to pull up this data

I appreciate that you are currently outside of these limits.

As there is no MIL light on the 3.9 there could be a diagnostic error that you don't know about, may be worth getting the codes checked

As well as the MAF it could be worth checking other common items, are the lambda sensor heaters working, is the engine temperature sensor working, and is the fuel pressure correct ?

Best wishes

Mike





Last edited by teknome; 14/10/20 09:44 PM.

---------------------------
Mike Smith


1995 +8
2007 +4
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