cobby
Member
Registered: 25th Oct 04
Location: chislehurst
User status: Offline
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ive replaced the cat with a second ahnd one, new lambda sensor, new centre box there are no faults on the ecu comming up just failing on natural idle should be below 0.5 but is like 2.8 but ok on fast idle and ideas please
[Edited on 08-08-2005 by cobby]
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paulszat
Member
Registered: 15th Aug 02
Location: Kent, UK
User status: Offline
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EGR valve?
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Stu_22
Member
Registered: 25th Mar 02
Location: Luton
User status: Offline
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coolant temp sensor?
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X 60RSA
Member
Registered: 20th Aug 01
Location: Lincoln
User status: Offline
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Did it fail CO or HC? or both?
[Edited on 08-08-2005 by X 60RSA]
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X 60RSA
Member
Registered: 20th Aug 01
Location: Lincoln
User status: Offline
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Basic fault finding for advanced emission test failures:
If a vehicle fails for high CO at idle and /or fast idle then.... if Lambda is too low, the mixture is too rich. This can be caused either by a misfire or by a faulty Lambda sensor. If it's running very rich, the 02 and HC will be higher than normal.
if it has a high Lambda and high 02 (0.5 to 1.5%), the "CAT" could be faulty. Before condemning it make sure its hot enough to work, the Lambda and other sensors are working OK and the exhaust downpipe hasn't got any leaks.
if the vehicle fails for high HC then ...if the CO passes, the vehicle is probably misfiring. Or if the CO fails and the Lambda reading is too low, the mixture is probably too rich and it may also be misfiring.
if the CO fails, the Lambda reading is high and the O2 reading is high (0.5 to 1.5%) the "CAT" could be faulty. Again check out the simple measures above before condemning it.
if the Lambda fails then...if its too high the Lambda sensor may be faulty, the mixture may be too weak or there may be a hole in the exhaust downpipe. If Lambda is too low the sensor may be faulty, the mixture may be rich or the vehicle may be misfiring.
THIS MIGHT HELP
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cobby
Member
Registered: 25th Oct 04
Location: chislehurst
User status: Offline
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how can u tell if the car is mis-firing, i know the car is running rich as idle so how can this be solved,
when u pull away the car splutters and feels really flat is this anything to do with misfire or running to rich
cheers
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glennpanton
Member
Registered: 30th Jul 01
Location: west sussex
User status: Offline
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do you have a after market air filter? these can affect emissions has been said on here before
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