marklawton
Member
Registered: 24th Apr 05
Location: Pensby, Wirral Drives:Golf mk4 GTI
User status: Offline
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my 1.4 sport failed its emissions yesterday by quite alot, whats the best way to get it down to the 0.2 limit?
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Dean_W
Member
Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline
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Cat converter back in........
Seriously, a bit of optimax and a good leathering on the way for the re-test did it fo me.
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Steve X16XE
Member
Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline
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some of that redex one shot in your tank. 99p from halfords.
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eel
Member
Registered: 19th Oct 06
User status: Offline
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do u have a induction kit
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csweatherston
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Registered: 16th Jan 06
Location: Devon
User status: Offline
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rest of the emissions figures?
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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comma fuel cleaner, or stp. whole bottle, full tank of optimax,
std air filter
put the cat in if you have removed it
sai back in if you hav removed that
new plugs and leads,
new lambda sensor, and cts sensor
thats pretty much all you can do
dailling that you gotta be chucking oil throu so stem seals or ring's or poss the ecu < but those things are extreme
[Edited on 14-03-2007 by Adam-D]
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scottc1088
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Registered: 7th Mar 05
Location: Chesterfield Drives: Corsa Gsi, Cbr600
User status: Offline
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did it just fail on co?
as asked before have you removed the cat?
oh btw the limits 0.3 not 0.2
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marklawton
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Registered: 24th Apr 05
Location: Pensby, Wirral Drives:Golf mk4 GTI
User status: Offline
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made this topic about a min before i had to go to work,
havent got the sheet with all the emissions cause there printer packed in or something.
still got the cat, also put some stuff in the fuel but didnt feel any difference before it went in, can feel the difference now,
got an induction so will put the original back on, also if the exhuast is blowing only a tiny bit will that make a difference?
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scottc1088
Member
Registered: 7th Mar 05
Location: Chesterfield Drives: Corsa Gsi, Cbr600
User status: Offline
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exhaust will put the lambda up not the co, it could affet the co if its blowing before the lambda sensor tho
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Adam-D
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Registered: 11th May 02
Location: Cheshire
User status: Offline
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sort the exhaust blow, change the cts and plugs regardless only about £10 for cts and £20 for plugs
then look to change'ing the lambda about £40 for one of them
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csweatherston
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Registered: 16th Jan 06
Location: Devon
User status: Offline
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haha, some funny replies here...
a blowing exhaust will put the lambda up if its before the cat, if theres a hole after the sensor it will just put the co up. (depending if you have 1 or 2 lambda sensors)
induction kit will make no difference, as all the air entering the engine (should) be metered.
sai will make no difference... as the car HAS TO be up to running temperature before the cat test is taken.
most probable causes, lambda sensor, hole in exhaust, cts, timing, cat, (unmetered) air leak.
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marklawton
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Registered: 24th Apr 05
Location: Pensby, Wirral Drives:Golf mk4 GTI
User status: Offline
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iam thinking it could be the lambda sensor, its done 99000 miles now dont no if its ever been changed, my brother had a new lambda sensor the other month, worth putting his on for the mot?
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scottc1088
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Registered: 7th Mar 05
Location: Chesterfield Drives: Corsa Gsi, Cbr600
User status: Offline
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quote:
Originally posted by csweatherston
haha, some funny replies here...
a blowing exhaust will put the lambda up if its before the cat, if theres a hole after the sensor it will just put the co up. (depending if you have 1 or 2 lambda sensors)
if the exhausts blowing it will affect the lambda wether its before or after the lambda sensor or cat. the exhaust blowing would only cause the co to go up if its blowing before the lambda sensor, not after
cheers
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csweatherston
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Registered: 16th Jan 06
Location: Devon
User status: Offline
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jesus...im not going to bother...... i am an MOT tester, your not 'scottc1088'.
end of..
mark, its worth getting the lambda tested, a simple voltmeter, check its switching is usually a good way. if you dont have access to any other test equipment. (just check the voltage is switching)
if your printout says somewhere around 14, then your lambda is more than likely ok.
the ideal is 14.7
[Edited on 14-03-2007 by csweatherston]
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scottc1088
Member
Registered: 7th Mar 05
Location: Chesterfield Drives: Corsa Gsi, Cbr600
User status: Offline
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no im not a mot tester, im a mechanic and also work in a mot station.
just explain to me how the exhaust blowing after the lambda sensor or cat can put the co up
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csweatherston
Member
Registered: 16th Jan 06
Location: Devon
User status: Offline
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a hole after the cat can make the co + hc's go up....
as the gas analyser is picking up extra oxygen.....
if tested on a 5 gas, you can actually see the o increase with the co.
if theres a hole before the cat/ lambda, the lambda reading will also go up with the co's and hc's..
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scottc1088
Member
Registered: 7th Mar 05
Location: Chesterfield Drives: Corsa Gsi, Cbr600
User status: Offline
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if theres a hole after the cat or sensor it cant put the co or hc up, how would hydrocarbons get into the exhaust from the air? the hc in the air is les than 20 ppm and the co is less than 0.01% so theres no way it can put the readings up.
back on topic now anyway
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