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 Posted: Tue Mar 29, 2011 2:49 pm |
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Joined: Jun 27, 2010
Posts: 74
Trade Rating: 0
Location: Midlands
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Bleedin' thing failed on emissions... pics below of the results and fail sheet... any advice?
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| I am better at legal and financial stuff than anything mechanical... but I will give anything a go so long as I have a Haynes manual | |
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Posted: Tue Mar 29, 2011 2:49 pm |
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Joined: Jun 27, 2010
Posts: 74
Trade Rating: 0
Location: Midlands
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Car has had a full service, new CAT and lambda sensor March 2010.
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Posted: Tue Mar 29, 2011 3:04 pm |
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Joined: Feb 07, 2010
Posts: 898
Trade Rating: +5
Location: Melton Mowbray Leicestershire
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| vjohn82 wrote: |
| Car has had a full service, new CAT and lambda sensor March 2010. |
Has it been serviced this year?
Was the CAT a good quality one as cheap ones can fall apart and fail in a relatively short time.
Any blows in the exhaust system?
EML on?
Has it been running fine recently?
Also take the car for a good run to get it nice and hot before hand as that tends to help to get the emissions down.
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Posted: Tue Mar 29, 2011 3:06 pm |
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Joined: Feb 07, 2010
Posts: 1645
Trade Rating: 0
Location: Chasing Ash, Addaz and Lee........... hopefully catching Addaz and havin fun :P
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Bang some Wynns pre MOT in your petrol and go for a blast 
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| 4.0 V8 S-Type Jaguar
Image removed due to size | |
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Posted: Tue Mar 29, 2011 3:25 pm |
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Joined: Feb 07, 2010
Posts: 3935
Trade Rating: +84
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only use shell petrol premium, they have additives to bring emissions down! make sure before the MOT you have run the engine for 1/2 hr before hand...
ps mine is tomorrow and i have shell petrol in there and taking it for a drive at 730 in order for the engine to be red hot!
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Posted: Tue Mar 29, 2011 3:28 pm |
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Joined: Dec 16, 2010
Posts: 1533
Trade Rating: +10
Location: UK
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as said above mate, all that you can do really, if it still fails after all of that its probs because of the high mileage? is it a small engine?
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| Please Dont take any of my posts as written fact. They are simply my opinion and although to the best of my knowledge true, the information within them may well be incorrect.
Any work you undertake as a result of my posts is done so at your own risk  | |
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Posted: Tue Mar 29, 2011 4:22 pm |
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Joined: Jun 27, 2010
Posts: 74
Trade Rating: 0
Location: Midlands
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I'll stick some high premium fuel in, some cleaner and thrash the life out of it... gotta be cheaper than diagnostics etc
CAT was good quality... so was lambda sensor.
Car serviced 2 weeks ago.
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| I am better at legal and financial stuff than anything mechanical... but I will give anything a go so long as I have a Haynes manual | |
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Posted: Tue Mar 29, 2011 4:31 pm |
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Joined: Feb 08, 2010
Posts: 10151
Trade Rating: +12
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DIAGNOSIS
Diagnosis of high emissions can be an involved process that usually requires special tools and measuring equipment. However, armed with a test report indicating what gases are high can help you determine what systems may not be functional. If the vehicle has failed as a result of high CO and HC, the CO failure should be diagnosed first. If the "Service Engine Soon" or "Check Engine" light is on it should be diagnosed prior to any emissions diagnosis. CO Failure is the result of an excessively rich air fuel mixture. The following is a list of the most common causes:
- Defective Oxygen Sensor
- Inoperative Air Injection System (if equipped)
- Leaking or defective Fuel Injectors
- Restricted air filter (especially if high CO is present only at high RPM)
- Vacuum leaks resulting in improper MAP sensor operation
- Defective air mass or air flow sensor
- Malfunctioning fuel evaporation system or purge valve
- Defective Catalytic Converter
- Defective thermostat (cooling system), thermostat stuck open
- Oil contaminated with fuel, excessive miles between oil changes
HC Failure is the result of incomplete combustion. Any item that causes incomplete combustion can result in high HC. The most common causes are:
- Worn spark plugs
- Defective spark plug wires
- Worn distributor cap and/or rotor
- Improper ignition timing, usually over advanced
- Vacuum leaks
- Engine mechanical failure, low compression, worn valves, excessive oil consumption
NOX Failure is the result of combustion temperatures that are too high. The most common causes are:
- Inoperative Exhaust Gas Recirculation System (EGR)
- Cooling system malfunction, engine running too hot (restricted radiator, defective thermostat, etc.)
- Over advanced ignition timing
- Excessively lean air fuel mixture (defective oxygen sensor, MAP sensor or Air Mass Sensor)
www.auto-repair-help.c...ailure.php
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Posted: Tue Mar 29, 2011 4:35 pm |
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Joined: Jun 27, 2010
Posts: 74
Trade Rating: 0
Location: Midlands
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Are my readings considered excessive?
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| I am better at legal and financial stuff than anything mechanical... but I will give anything a go so long as I have a Haynes manual | |
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Posted: Tue Mar 29, 2011 5:24 pm |
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Joined: May 06, 2010
Posts: 307
Trade Rating: +3
Location: Hull
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Mine just failed on emissions 3 days ago. It was the bottom reading and he suggested lambda sensor or potentially CAT.
Sorry to hijack but whilst it's been brought up, can someone clarify if this is reasonable or is he being a cowboy?
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| Team: Slightly addicted to 206Info.co.uk
Team: PS CS4  | |
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Posted: Tue Mar 29, 2011 5:26 pm |
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Joined: Feb 07, 2010
Posts: 1645
Trade Rating: 0
Location: Chasing Ash, Addaz and Lee........... hopefully catching Addaz and havin fun :P
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| ReeVo wrote: |
Mine just failed on emissions 3 days ago. It was the bottom reading and he suggested lambda sensor or potentially CAT.
Sorry to hijack but whilst it's been brought up, can someone clarify if this is reasonable or is he being a cowboy? |
I know of an unscrupoulous character that if your cars over the emmisions test, he shoves the probe up an exhaust that will pass it 
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| 4.0 V8 S-Type Jaguar
Image removed due to size | |
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Posted: Tue Mar 29, 2011 5:34 pm |
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Joined: Feb 08, 2010
Posts: 10151
Trade Rating: +12
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| namgaj wrote: |
| ReeVo wrote: |
Mine just failed on emissions 3 days ago. It was the bottom reading and he suggested lambda sensor or potentially CAT.
Sorry to hijack but whilst it's been brought up, can someone clarify if this is reasonable or is he being a cowboy? |
I know of an unscrupoulous character that if your cars over the emmisions test, he shoves the probe up an exhaust that will pass it |
or could just pay him a few cans of beer
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Posted: Tue Mar 29, 2011 6:11 pm |
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Joined: Apr 16, 2010
Posts: 147
Trade Rating: 0
Location: Leigh, Tonbridge, Kent
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id take it to the dealer, £49.50 for a diagnostic read. that will more then likely give you the cause and then take the right action no point trying to fix it by p**sing in the wind and hoping for the best. who knows it could be something simple?
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| Peugeot 206 Zest 1.1 5 door | |
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Posted: Wed Mar 30, 2011 1:27 am |
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Joined: Jun 27, 2010
Posts: 74
Trade Rating: 0
Location: Midlands
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The car passed on the lambda sensor though so it can't be that. It must be the CAT then... which is balls.
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Posted: Wed Mar 30, 2011 1:29 am |
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Joined: Jun 27, 2010
Posts: 74
Trade Rating: 0
Location: Midlands
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If the car passed on the lambda sensor... (meaning the o2 levels were ok at that point) but the CO levels were out of whack when it reached the probe would it be reasonable to suggest that the CAT might be at fault?
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