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Author Topic: MoT update  (Read 2105 times)

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Bob G

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MoT update
« on: 21 August 2012, 16:39:48 »
Well after the work that James had done on Saturday took it for emissions retest, totally gobsmacked when it failed!!!! first idle reading was down from 63% to 53%, they never bothered with second, car had been worked hard prior to testing, new plugs, breathers clear, new oil and filters.  So over to wonderful experts.
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JamesV6CDX

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Re: MoT update
« Reply #1 on: 21 August 2012, 17:20:50 »
Well the fact it's gone down by 10% implies that fixing that split vaccum at the throttle body has made at least some difference..  :-\

Have they tried to test on LPG, using LPG criteria?

Next step I guess is to look at the live data and lambda operation. I wonder if lambda/cat are tired.. :/

Ref the low idle, it sounded fine to me, but I've not had a huge amount of 4 pot involvement...
 
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JamesV6CDX

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Re: MoT update
« Reply #2 on: 21 August 2012, 17:21:56 »
I'd be interested in the CTS values too. Wonder if it's running a bit cool, and hence rich...

I think a live data run is required :y
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Bob G

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Re: MoT update
« Reply #3 on: 21 August 2012, 17:41:37 »
Quote from: JamesV6CDX on 21 August 2012, 17:20:50
Well the fact it's gone down by 10% implies that fixing that split vaccum at the throttle body has made at least some difference..  :-\

Have they tried to test on LPG, using LPG criteria?

Next step I guess is to look at the live data and lambda operation. I wonder if lambda/cat are tired.. :/

Ref the low idle, it sounded fine to me, but I've not had a huge amount of 4 pot involvement...

Once he saw the figures did not go any further so no LPG done, lambda is on max reading, he said it seemed to hunt every so often
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Andy H

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Re: MoT update
« Reply #4 on: 21 August 2012, 19:24:26 »
I wonder if the long term trims need resetting?

A combination of running on LPG and the split vacuum pipe may have taught the ECU some bad habits :-\
« Last Edit: 21 August 2012, 19:28:57 by Andy H »
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Bob G

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Re: MoT update
« Reply #5 on: 21 August 2012, 19:43:21 »
Getting a lot of comments about fuel pressure regulator what think the panel?
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Bob G

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Re: MoT update
« Reply #6 on: 21 August 2012, 22:37:14 »
not sure if it is connected but out a while ago running on LPG when it just cut out totally and left me going round a corner rather amazed, luckily it was Tescos car park so no harm done
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Bob G

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Re: MoT update
« Reply #7 on: 22 August 2012, 09:24:05 »
any suggestions guys that can help James, I do not want to go to garage if it can be helped.

Just had anonther look at figures and thought I should post the lot;
Fast idle test CO level .63% fail
HC level 111pm pass
Lambda 1.03 Pass on max though

2nd fast idle
CO level 0.51% fail
HC level 119ppm Pass
Lambda 1.03 Pass

natural idle
CO level .039% Pass  max allowed 0.50%  seems low compared to the other readins, is there a clue there somewere?
« Last Edit: 22 August 2012, 09:37:07 by Bob G »
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Kevin Wood

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Re: MoT update
« Reply #8 on: 22 August 2012, 10:09:18 »
Would be worth having a look at what the fuel trims are doing at both idle and fast idle.

Very low CO at idle suggests the cat and lambda sensors are in reasonable nick but that the mixture is going out at fast idle for some reason. Fuel trims may offer an explanation?

I would stick to running it on petrol until resolved to eliminate any LPG issues. If you present it on petrol they must test on petrol.
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TheBoy

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Re: MoT update
« Reply #9 on: 22 August 2012, 11:49:45 »
Did the fast idle co reduce over time, esp if the nuts were revved off it a few seconds before? Thats a sign of tired cat IME, even though idle co is ok
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Bob G

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Re: MoT update
« Reply #10 on: 22 August 2012, 16:20:29 »
No the idle stayed the same during the test, only reduction could be James work with plugs and split pipes
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aaronjb

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Re: MoT update
« Reply #11 on: 22 August 2012, 16:22:24 »
Quote from: Bob G on 22 August 2012, 16:20:29
No the idle stayed the same during the test, only reduction could be James work with plugs and split pipes

I think what Jaime meant was, did the CO reading during the fast idle test slowly fall (especially if the tester had revved the nuts off the car first to heat the CAT up), rather than did the idle speed reduce over time.. which is I think what you were answering?
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Bob G

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Re: MoT update
« Reply #12 on: 22 August 2012, 16:24:55 »
Quote from: aaronjb on 22 August 2012, 16:22:24
Quote from: Bob G on 22 August 2012, 16:20:29
No the idle stayed the same during the test, only reduction could be James work with plugs and split pipes

I think what Jaime meant was, did the CO reading during the fast idle test slowly fall (especially if the tester had revved the nuts off the car first to heat the CAT up), rather than did the idle speed reduce over time.. which is I think what you were answering?

My poor choice of words but no the reading was constant for CO I watched it yesterday and the car was hot and as soon as the reading came up the 53% appeared and stayed
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Bob G

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Re: MoT update
« Reply #13 on: 22 August 2012, 22:52:41 »
Had it checked out by independant MoT tester who reckons cat is poorly, get that changed under warranty and take it from there.  So that might be next step
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TheBoy

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Re: MoT update
« Reply #14 on: 23 August 2012, 15:44:15 »
I'd expect a tired cat to drop the CO over time, esp if the nuts had been revved off it seconds earlier to make the cat hot
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