Vauxhall Astra F (1991 - 1998) - 1996 1.6 catalytic converters

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Sat 2 Aug 2008 17:39
1996 1.6 catalytic converters - slowdown avenue
my 1.6 16v astra auto 1996 has failed mot on emissions co .to high ive replaced lambda , cleaned egr valve, serviced the car, used cataclean,. the exhaust has always smelt a bit rich, and the car has always been a bit juicy. so does this mean the cat is cooked, or is it a symptom of something else .

Edited by Pugugly on 02/08/2008 at 19:15

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Sat 2 Aug 2008 20:57
1996 1.6 catalytic converters - Screwloose

What were the exact readings - all of them?
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Sat 2 Aug 2008 23:02
1996 1.6 catalytic converters - slowdown avenue
fast idle co .47fail should be .30
hc 24ppm pass 200
lambda1.01 pass 0.97 to 1.03

second fast idle co .30 pass should be .30
hc 16 ppm pass 200
lambda 1.00pass .97 1.03

natural idle co .94 fail should be 0.50
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Sat 2 Aug 2008 23:15
1996 1.6 catalytic converters - yorkiebar
exhaust blow/leak ?
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Sat 2 Aug 2008 23:37
1996 1.6 catalytic converters - slowdown avenue
its had 2 cats in its past life , recently had mid box, the rear exhaust is near its life end, since changing the lambda i can hear what sounds like back fireing on about 2000 revs coming from mid exhaust, but couldnt feel any blowing , ill take another look tomorrow
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Sat 2 Aug 2008 23:53
1996 1.6 catalytic converters - slowdown avenue
couldnt feel any, but ill get it up again and have another look, it passed mot on exhaust
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Sat 2 Aug 2008 23:57
1996 1.6 catalytic converters - Screwloose

Get it hot and watch the voltage on the oxygen sensor at idle; look for it sweeping at around 1 sweep per second.
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