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Old 14-04-2019   #1
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mk 2 punto emissions failure

hi,
my 2000 reg punto failed emissions test today.
The results were high idle 2770rpm CO 0.50 vol%
Anything above 0.30% is a fail.
Is it worth changing the lamba sensor?
i have been getting a misfire now and then ,but then it clears
any ideas before i scrap the car?
tony
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Old 14-04-2019   #2
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Re: mk 2 punto emissions failure

What engine has it got?
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Old 15-04-2019   #3
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Re: mk 2 punto emissions failure

its 1.2 8 valve
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Old 15-04-2019   #4
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Re: mk 2 punto emissions failure

Also i have to keep topping the car up with engine oil recently.
Would this be a sign of worn guide valve seals?
tony
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Old 16-04-2019   #5
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Re: mk 2 punto emissions failure

Quote Originally Posted by TONY55S View Post
Also i have to keep topping the car up with engine oil recently.
Would this be a sign of worn guide valve seals?
tony
Perhaps. But that depends if there's any other visible oil leaks
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Old 16-04-2019   #6
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Re: mk 2 punto emissions failure

Have you tried some fuel system cleaner down it's tank and ran it
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Old 16-04-2019   #7
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Re: mk 2 punto emissions failure

I am fairly sure its the intermittant misfire that is causing the emissions to fail.
I have changed leads,coil pack ,plugs,and the fact the car is using oil leads me to think something in the engine has worn out since it has 150k miles done.
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Old 16-04-2019   #8
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Re: mk 2 punto emissions failure

What do the plugs look like?
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Old 17-04-2019   #9
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Re: mk 2 punto emissions failure

I removed all 4 plugs last nite.
Starting from the left side of the engine as you look in,
the first 2 plugs were a dry whitish colour,and the last 2 were fairly black
with bits of soot which i cleaned off.
tony
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Old 17-04-2019   #10
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Re: mk 2 punto emissions failure

The car passed the co on low idle,but failed on high idle.
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Old 18-04-2019   #11
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Re: mk 2 punto emissions failure

Might be worth swapping the injectors from that side to the other and see if the plug colour moves. As mentioned already a bit of injector cleaner could help.
If it was worn out I would expect the black plugs to be wet rather than dry.
A compression test would be the next thing to try.
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