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Topic: MOT passed but..... (Read 1402 times) |
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Nunnspoet
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I love YaBB 1G - SP1!
Posts: 798
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MOT passed but.....
« on: Apr 27th, 2010, 8:45am » |
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... not quite estatic as she only just passed.
What do you think?
Fast Idle Test:
RPM Min limit Max limit Actual Value
2500 3000 2718
CO Max limit Actual Value
0.200 0.101
HC 200 19
Lambda Min limit Max limit Actual Value
0.970 1.030 1.001
Natural Idle Test:
RPM Min Limit Max Limit Actual Value
450 1500 709
CO ........... 0.3000 0.299
Am I right in saying that she only just passed? Aaaannnndddd am I right in suspecting one of the Oxygen sensors, folks?
Mike
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Nunnspoet
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Re: MOT passed but.....
« Reply #1 on: Apr 27th, 2010, 8:48am » |
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Sorry but the text has slipped across and the Values are not under the Titles. They have slipped to the left but I think you will be able to follow it ok.
Mike
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martin_rowe
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Re: MOT passed but.....
« Reply #2 on: Apr 27th, 2010, 10:28am » |
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looks fine dont worry.
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Nunnspoet
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Re: MOT passed but.....
« Reply #3 on: Apr 27th, 2010, 3:34pm » |
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 Ta very much Martin
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tlundkvi
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Ex. Scorpio 2.9 24V -95
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Re: MOT passed but.....
« Reply #4 on: Apr 27th, 2010, 5:13pm » |
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Is that just wandering figures, or did you have an idle CO of 0.299 when 0.3 is allowed? If the lambda is 1.001 the lambda sensors are IMHO in order, shouldn't the system otherwise mess it up? What model is it and do you know if the cat is original?
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Nunnspoet
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Re: MOT passed but.....
« Reply #5 on: Apr 28th, 2010, 8:35am » |
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Thanks tlundkvi. Yes, CO reading 0.299 when 0.3 allowed. This is why I am concerned about the MOT result. She is a 1996 2.9 V6 Scorpio Cosworth Ultima Estate with 143,000 miles on the clock. EricR replaced the nearside Cat about 5?years ago but I don't know about the offside Cat. It looks pretty old.
The Fast Idle Test CO figures of 0.200 Max Limit with an Acutual Value of 0.101 may in comparison to the Natural Idle result, mean something to you or indeed somebody else.
I am in possesion of an OBD lead at present but am still learning how to get the best out of it. I did a read-out just prior to the MOT, clearing the Codes which showed the 2 post Cat sensors as useless and reported a fault ERG. The post Cat sensors don't matter and because the EGR fitment to the Exhaust was loose and I was/am broke and could not afford to get it welded I removed EGR completely blocking the 2 orifices with 2x1 pennies. Hence "The Beast" is now refered to as "Tuppence" so that explains the Fault Codes.
Mike
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amigafan2003
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Re: MOT passed but.....
« Reply #6 on: Apr 28th, 2010, 3:18pm » |
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The catalyst probably wasn't very hot. I bet a spirited drive round the block would have bought the CO reading right down.
Really, there is nothing wrong with those figures at all. I've noticed during my supervision of MOT's that 50% of them fail on the idle test initialy - a quick drive round the block gets 99% of them through.
Quote:| clearing the Codes which showed the 2 post Cat sensors as |
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We're they totally out of spec or reading rich? Rich post cat means the cats are failing (or not hot enough as I have aluded to already).
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Mike H
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Renault Clio
 
Posts: 2594
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Re: MOT passed but.....
« Reply #7 on: Apr 28th, 2010, 7:47pm » |
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I have more than once had the EGR valve taken off and cleaned to ensure it gets through the emissions. It's left to soak in something overnight, can't remember what offhand
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Mike H
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tlundkvi
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Ex. Scorpio 2.9 24V -95
Posts: 909
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Re: MOT passed but.....
« Reply #8 on: Apr 28th, 2010, 8:16pm » |
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on Apr 28th, 2010, 8:35am, Nunnspoet wrote:Thanks tlundkvi. Yes, CO reading 0.299 when 0.3 allowed. This is why I am concerned about the MOT result. She is a 1996 2.9 V6 Scorpio Cosworth Ultima Estate with 143,000 miles on the clock. EricR replaced the nearside Cat about 5?years ago but I don't know about the offside Cat. It looks pretty old.
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Mine failed on me in winter 2008 on a -95 cossie, so they can fail. I would recommend exhaust testing 2 months or so before next MOT. But you apparently have a year to prepare yourself. I tried vacuum leaks, sensor switches, 2x forte, driving 80km/h in 2nd etc. Luckily one cat is quite cheap from buypartsby.
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Nunnspoet
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Re: MOT passed but.....
« Reply #9 on: Apr 29th, 2010, 7:33am » |
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. Thanks everybody for your input and advice. I really apreciate it.
Mike 
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: MOT passed but.....
« Reply #10 on: Apr 29th, 2010, 12:51pm » |
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It's quite feasible the EGR functions at idle and fast idle for the test (no 'load' as such on the motor, so not much fuel / air needed), but because you took it off it's not being diluted by recycled exhaust gas, hence the high numbers. Just a guess. It's the only explanation I can think of that matches my own experiences.
That is to say, first emission test, it's a bit high, or even too high, clean the EGR, it's better. (?)
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Mike H
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Nunnspoet
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Re: MOT passed but.....
« Reply #11 on: May 4th, 2010, 10:24am » |
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I'm a bit poorley at the moment, but I'll be back.
Mike
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Mike H
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Renault Clio
Posts: 2594
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Re: MOT passed but.....
« Reply #12 on: May 4th, 2010, 12:30pm » |
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Sorry about that, hope you recover soon!
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Mike H
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Nunnspoet
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Posts: 798
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Re: MOT passed but.....
« Reply #13 on: May 8th, 2010, 5:54pm » |
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Ta very much
Mike
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Albert_Ross
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Re: MOT passed but.....
« Reply #14 on: May 9th, 2010, 7:39am » |
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My thoughts on this one... (I am a class 4 MOT Tester) The natural idle test was carried out too soon after the fast idle test, not given about 30 seconds between the 2. Normally, on an older vehicle with a cat, at higher mileage, recovery time is slightly longer, so I give a bit more time to let the system settle. Everything is probably completely normal, so I shouldn't worry about it.
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How much??
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Nunnspoet
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Posts: 798
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Re: MOT passed but.....
« Reply #15 on: May 9th, 2010, 9:36am » |
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Something to ponder there Albert. Thanks.
My mind is a lot easier now.
Mike
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Nunnspoet
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Posts: 798
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Re: MOT passed but.....
« Reply #16 on: May 9th, 2010, 9:38am » |
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Smileys should have been . Ahh well.
Mike
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: MOT passed but.....
« Reply #17 on: May 9th, 2010, 10:08am » |
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on May 9th, 2010, 7:39am, Albert_Ross wrote:| My thoughts on this one... (I am a class 4 MOT Tester) The natural idle test was carried out too soon after the fast idle test, not given about 30 seconds between the 2. Normally, on an older vehicle with a cat, at higher mileage, recovery time is slightly longer |
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That makes sense!
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Mike H
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