(Fixed) High Emissions

[Big Jeff]

ok people my year mot was to and it fail

i has a high CO emission, (max alloud 0.300 atural 0.457) so bit bit rich,,,

my first thougs be be a sticky injecter, as my friend said he could smell pertol

any advise would be nice..

[Daniel]

Hi,
How much CO at idle?
How much CO at accelerated (2000rpm)?
Do you know values for: HC, CO², O², Lambda ?
Were basic maintenance done: air filter, fresh gas, oil & filter, plugs,...

[Big Jeff]

fast ldea max limits
rpm 2850
co: 0.300
hc:200
lambda:1.030

1st fast idle
RPM: 2488
co %vol: 0.453
HC: 129
lamdda: 1.054

2nd fast test
rpm: 2471
co: 0.478
hc: 100
lambda: 1.047

natural ldle
rpm: 840
co: 0.167 (max alloud 0.100)

[Daniel]

fast ldea max limits
rpm 2850
co: 0.300
hc:200
lambda:1.030

1st fast idle
RPM: 2488
co %vol: 0.453
HC: 129
lamdda: 1.054

2nd fast test
rpm: 2471
co: 0.478
hc: 100
lambda: 1.047

natural ldle
rpm: 840
co: 0.167 (max alloud 0.100)

Your CO values show a slightly rich combustion, while the Lambda values (>1.03) show a rather lean combustion!
I would first check for a possible leak in exhaust system. No "hiss" sound when you partially block exhaust with a cloth?
Or maybe a lazy cat.
Wait for other inputs.

BTW what car and mileage?

[Big Jeff]

there is a slight air leak at center and backbox flanges...
the cat is only a year old.

i suppose i could get some exhaust putty, and whak some of that in between the flanges,

and my car is a lanos 1.6 DOHC and i would say is done about 20k miles..

[Daniel]

there is a slight air leak at center and backbox flanges...

Fix that first. As this leak can be also a air intake fooling gas analyser.

[Big Jeff]

yeah that what i plan to do tomorrow....

my mate is going to help me sort the other faults out....
he also say i should replace my O2 sensor just to be safe.

[Daniel]

he also say i should replace my O2 sensor just to be safe

You may. Not sure it's the problem.

[Trey05Woo]

check ignition system
check egr

[Big Jeff]

i think its the leak in the exhaust...and maybe a sticky injector

coz from what i can tell the O2 senser is say lean. which could be because of the leak, which would read there being more o2 then there should..
as such would tell the ecu to add more fuel... which would make the CO levels highs..

[Daniel]

I've found some funny things about Lambda calculation .


http://www.smogsite.com/calculators.


Simplified

Brett.jpg

Complete

Brett3.jpg

Can't understand anything

[Big Jeff]

that confuse me as well...

so let say

the more o2 in the exhuast the senser will think it running lean... so it will add more fuel....

[Big Jeff]

Hehe

i took my car to a friend to mot.. we sealed the small air leak and the reading on the gas analysis fell to normal limits...

so at the end of the MOT all it needs so some new tyres soon. there and a small wear patten but still legal