SEAT Leon (1999 - 2005) - 2000 1.4 High emissions

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Tue 22 Jul 2008 22:27
2000 1.4 High emissions - Shane Mc D
My car recently failed its MOT on high emissions. I replaced the catalytic converter and it didn?t bring down the emissions and it failed again. Anybody any idea?s what else it could be?

Thanks.
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Tue 22 Jul 2008 22:49
2000 1.4 High emissions - Screwloose

What were the figures on both tests - natural and fast idle?

What tests have you done so far? What's the engine code?
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Tue 22 Jul 2008 23:49
2000 1.4 High emissions - Shane Mc D
It was for the Irish MOT. I origionly taught it was the cat and changed it out and got the cat retested.

Before the catalytic convertor was changed:
Low Idle (720rpm) CO 0.45vol%, HC 0ppm.
High Idle (2690rpm) Lambda 1.025, CO 0.64vol%(fail), HC 228ppm(fail).

After the catalytic convertor was changed:
Low Idle (740rpm) CO 0.32vol%, HC 0ppm.
High Idle (2690rpm) Lambda 1.023, CO 0.65vol%(fail), HC 227ppm(fail).

Engine code is AHW.
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Wed 23 Jul 2008 00:59
2000 1.4 High emissions - Screwloose
Shane

The gases suggest it's too rich; the Lambda too lean. Is there any way you can get it on a 4-gas analyser? Does it run smoothly?

Are there any leaks in the exhaust manifold area? Can you get it plugged-in and the codes/live-data read? The thrust [MAP] and oxygen sensor readings would be useful.
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Wed 23 Jul 2008 00:42
2000 1.4 High emissions - slowdown avenue
if your going down the guessing route , try lambda sensor
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