MOT Failure

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M

Mark Solesbury

Guest
Olah!

The rangie has just failed the MOT on emisions.

Help!!

CO (%vol) Max Limit = 3,500 Actual Value = 0.211 - Pass
HC (ppm vol) Max Limit = 1,200 Actual Value = 1493 - FAIL

What can i do to reduce it a tad?
I have replaced all the HT leads since the MOT as she was running a bit
lumpy. Its made a bit of difference, but she still isnt running right.

Plugs next?

Mark.
87 RR V8 EFI.


 

"Mark Solesbury" <[email protected]> wrote in message
news:hZb%[email protected]...
> Olah!
>
> The rangie has just failed the MOT on emisions.
>
> Help!!
>
> CO (%vol) Max Limit = 3,500 Actual Value = 0.211 - Pass
> HC (ppm vol) Max Limit = 1,200 Actual Value = 1493 - FAIL
>
> What can i do to reduce it a tad?
> I have replaced all the HT leads since the MOT as she was running a bit
> lumpy. Its made a bit of difference, but she still isnt running right.
>
> Plugs next?
>
Change plugs, try a dose of injector cleaner, then an Italian tune up, RR
engines are so lazy they never get thrashed properly to clean the gunk out!


 
Its not that far out is it?

Trouble is, she is sorned at the moment, and i cant use her on the road as
she has no MOT.

Can i get some injector cleaner from HalFRAUDs?



> Change plugs, try a dose of injector cleaner, then an Italian tune up, RR
> engines are so lazy they never get thrashed properly to clean the gunk
out!
>
>


 
Plugs every time

lee
"Mark Solesbury" <[email protected]> wrote in message
news:wgc%[email protected]...
> Its not that far out is it?
>
> Trouble is, she is sorned at the moment, and i cant use her on the road
> as
> she has no MOT.
>
> Can i get some injector cleaner from HalFRAUDs?
>
>
>
>> Change plugs, try a dose of injector cleaner, then an Italian tune up, RR
>> engines are so lazy they never get thrashed properly to clean the gunk
> out!
>>
>>
>
>


 
On Fri, 30 Sep 2005 14:29:33 GMT, "Mark Solesbury"
<[email protected]> wrote:

>Olah!
>
>The rangie has just failed the MOT on emisions.
>
>Help!!
>
>CO (%vol) Max Limit = 3,500 Actual Value = 0.211 - Pass
>HC (ppm vol) Max Limit = 1,200 Actual Value = 1493 - FAIL
>
>What can i do to reduce it a tad?
>I have replaced all the HT leads since the MOT as she was running a bit
>lumpy. Its made a bit of difference, but she still isnt running right.

with my old saab I found that the HC value was inversely proportinal
to the CO - so failing on the HC meant it was running too lean, and
vice versa.
Or i had a vacuum leak. that cause the same thing (low CO, high HC)

 
8 new plugs and she sounds like a V8 agian.

Cheers lads!!


"Phantom" <[email protected]> wrote in message
news:[email protected]...
> Plugs every time
>
> lee
> "Mark Solesbury" <[email protected]> wrote in message
> news:wgc%[email protected]...
> > Its not that far out is it?
> >
> > Trouble is, she is sorned at the moment, and i cant use her on the road
> > as
> > she has no MOT.
> >
> > Can i get some injector cleaner from HalFRAUDs?
> >
> >
> >
> >> Change plugs, try a dose of injector cleaner, then an Italian tune up,
RR
> >> engines are so lazy they never get thrashed properly to clean the gunk
> > out!
> >>
> >>
> >
> >
>
>


 
On or around Fri, 30 Sep 2005 14:29:33 GMT, "Mark Solesbury"
<[email protected]> enlightened us thusly:

>Olah!
>
>The rangie has just failed the MOT on emisions.
>
>Help!!
>
>CO (%vol) Max Limit = 3,500 Actual Value = 0.211 - Pass
>HC (ppm vol) Max Limit = 1,200 Actual Value = 1493 - FAIL
>
>What can i do to reduce it a tad?
>I have replaced all the HT leads since the MOT as she was running a bit
>lumpy. Its made a bit of difference, but she still isnt running right.
>
>Plugs next?

which engine/fuel setup? they can all be adjusted. Sometimes, high HC is
caused by burning oil, but it can also be an odd single misfire or two,
dumping unburnt fuel down the pipe. Plugs might well help.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Would to God that we might spend a single day really well!"
Thomas À Kempis (1380 - 1471) Imitation of Christ, I.xxiii.
 
>From the MOT testers manual:

Manual Ref: 7.3 page 5 M.o.I. B 2

If a vehicle meets the CO requirement at its normal idling speed, but
fails the HC check,
re-check the HC level at a high idle speed of 2000rpm. If the HC
reading is then 1200ppm or less,
the vehicle will meet both the CO and HC limits.

Was the 2000 rpm test done ?

If not, go back & have it re checked...



Visit The MOT Forum:
http://motforum.proboards44.com

 
On or around 30 Sep 2005 16:38:14 -0700, "NT" <[email protected]>
enlightened us thusly:

>>From the MOT testers manual:
>
>Manual Ref: 7.3 page 5 M.o.I. B 2
>
>If a vehicle meets the CO requirement at its normal idling speed, but
>fails the HC check,
>re-check the HC level at a high idle speed of 2000rpm. If the HC
>reading is then 1200ppm or less,
>the vehicle will meet both the CO and HC limits.
>
>Was the 2000 rpm test done ?

I thought that only applied to certain vehicles?

I know there's an exemption for SU carbs, which are notorious for running
rich at idle, if it won't pass at idle you can up the idle speed. CO and
HC, ISTR.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Appearances: You don't really need make-up. Celebrate your authentic
face by frightening people in the street.
from the Little Book of Complete B***ocks by Alistair Beaton.
 
The 2000 rpm test is for ALL vehicles (1/8/1975-31/7/1992) that meet
CO, but HC too high.

 

"Austin Shackles" <[email protected]> wrote in message
news:[email protected]...
> On or around 30 Sep 2005 16:38:14 -0700, "NT" <[email protected]>
> enlightened us thusly:
>
>>>From the MOT testers manual:
>>
>>Manual Ref: 7.3 page 5 M.o.I. B 2
>>
>>If a vehicle meets the CO requirement at its normal idling speed, but
>>fails the HC check,
>>re-check the HC level at a high idle speed of 2000rpm. If the HC
>>reading is then 1200ppm or less,
>>the vehicle will meet both the CO and HC limits.
>>
>>Was the 2000 rpm test done ?
>
> I thought that only applied to certain vehicles?
>
> I know there's an exemption for SU carbs, which are notorious for running
> rich at idle, if it won't pass at idle you can up the idle speed. CO and
> HC, ISTR.
> --
> Austin Shackles. www.ddol-las.net my opinions are just that
> Appearances: You don't really need make-up. Celebrate your authentic
> face by frightening people in the street.
> from the Little Book of Complete B***ocks by Alistair Beaton.

when we take our V8 90 for MOT I adjust the mixture to make it leaner then
richen it up after. I believe for our year one the limit CO is 4.5% but it
runs best at about 6%. I think thats what it was.

Richard



 
On or around 1 Oct 2005 05:18:43 -0700, "NT" <[email protected]>
enlightened us thusly:

>The 2000 rpm test is for ALL vehicles (1/8/1975-31/7/1992) that meet
>CO, but HC too high.

ah, right. The one for SU carbs is about meeting the CO as well - it's
recognised that it's not always possible to tune an SU-carb engine to meet
the appropriate levels.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Satisfying: Satisfy your inner child by eating ten tubes of Smarties
from the Little Book of Complete B***ocks by Alistair Beaton.
 

"Mark Solesbury" <[email protected]> wrote in message
news:hZb%[email protected]...
> Olah!
>
> The rangie has just failed the MOT on emisions.
>
> Help!!
>
> CO (%vol) Max Limit = 3,500 Actual Value = 0.211 - Pass
> HC (ppm vol) Max Limit = 1,200 Actual Value = 1493 - FAIL
>
> What can i do to reduce it a tad?
> I have replaced all the HT leads since the MOT as she was running a bit
> lumpy. Its made a bit of difference, but she still isnt running right.
>
> Plugs next?
>
Change plugs, try a dose of injector cleaner, then an Italian tune up, RR
engines are so lazy they never get thrashed properly to clean the gunk out!


 
Its not that far out is it?

Trouble is, she is sorned at the moment, and i cant use her on the road as
she has no MOT.

Can i get some injector cleaner from HalFRAUDs?



> Change plugs, try a dose of injector cleaner, then an Italian tune up, RR
> engines are so lazy they never get thrashed properly to clean the gunk
out!
>
>


 
Plugs every time

lee
"Mark Solesbury" <[email protected]> wrote in message
news:wgc%[email protected]...
> Its not that far out is it?
>
> Trouble is, she is sorned at the moment, and i cant use her on the road
> as
> she has no MOT.
>
> Can i get some injector cleaner from HalFRAUDs?
>
>
>
>> Change plugs, try a dose of injector cleaner, then an Italian tune up, RR
>> engines are so lazy they never get thrashed properly to clean the gunk
> out!
>>
>>
>
>


 
On Fri, 30 Sep 2005 14:29:33 GMT, "Mark Solesbury"
<[email protected]> wrote:

>Olah!
>
>The rangie has just failed the MOT on emisions.
>
>Help!!
>
>CO (%vol) Max Limit = 3,500 Actual Value = 0.211 - Pass
>HC (ppm vol) Max Limit = 1,200 Actual Value = 1493 - FAIL
>
>What can i do to reduce it a tad?
>I have replaced all the HT leads since the MOT as she was running a bit
>lumpy. Its made a bit of difference, but she still isnt running right.

with my old saab I found that the HC value was inversely proportinal
to the CO - so failing on the HC meant it was running too lean, and
vice versa.
Or i had a vacuum leak. that cause the same thing (low CO, high HC)

 
8 new plugs and she sounds like a V8 agian.

Cheers lads!!


"Phantom" <[email protected]> wrote in message
news:[email protected]...
> Plugs every time
>
> lee
> "Mark Solesbury" <[email protected]> wrote in message
> news:wgc%[email protected]...
> > Its not that far out is it?
> >
> > Trouble is, she is sorned at the moment, and i cant use her on the road
> > as
> > she has no MOT.
> >
> > Can i get some injector cleaner from HalFRAUDs?
> >
> >
> >
> >> Change plugs, try a dose of injector cleaner, then an Italian tune up,
RR
> >> engines are so lazy they never get thrashed properly to clean the gunk
> > out!
> >>
> >>
> >
> >
>
>


 
On or around Fri, 30 Sep 2005 14:29:33 GMT, "Mark Solesbury"
<[email protected]> enlightened us thusly:

>Olah!
>
>The rangie has just failed the MOT on emisions.
>
>Help!!
>
>CO (%vol) Max Limit = 3,500 Actual Value = 0.211 - Pass
>HC (ppm vol) Max Limit = 1,200 Actual Value = 1493 - FAIL
>
>What can i do to reduce it a tad?
>I have replaced all the HT leads since the MOT as she was running a bit
>lumpy. Its made a bit of difference, but she still isnt running right.
>
>Plugs next?

which engine/fuel setup? they can all be adjusted. Sometimes, high HC is
caused by burning oil, but it can also be an odd single misfire or two,
dumping unburnt fuel down the pipe. Plugs might well help.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Would to God that we might spend a single day really well!"
Thomas À Kempis (1380 - 1471) Imitation of Christ, I.xxiii.
 
On or around 30 Sep 2005 16:38:14 -0700, "NT" <[email protected]>
enlightened us thusly:

>>From the MOT testers manual:
>
>Manual Ref: 7.3 page 5 M.o.I. B 2
>
>If a vehicle meets the CO requirement at its normal idling speed, but
>fails the HC check,
>re-check the HC level at a high idle speed of 2000rpm. If the HC
>reading is then 1200ppm or less,
>the vehicle will meet both the CO and HC limits.
>
>Was the 2000 rpm test done ?

I thought that only applied to certain vehicles?

I know there's an exemption for SU carbs, which are notorious for running
rich at idle, if it won't pass at idle you can up the idle speed. CO and
HC, ISTR.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Appearances: You don't really need make-up. Celebrate your authentic
face by frightening people in the street.
from the Little Book of Complete B***ocks by Alistair Beaton.
 
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