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BrentLord
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Posted 2/14/2007 1:22:33 PM
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Group: Forum Members
Last Active: 1/8/2013 3:31:54 AM
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Got a 1996 with the following fail sheet from the MOT
Natural idle test passed at 865rpm CO 0.27%
But when tested at fast idle 2800rpm CO is 0.4% (never less than 0.4%; 0.3 max) HC 59ppm and lambda 1.01
Car has been serviced before arriving with us. Has anyone got any direction? Fords are completely foreign to me as I'm a Peugeot man; double doh!
The car drove home OK without misfire and with good performance. Is there anything common I should check. I was thinking of checking the plug gaps first.
No fault codes present btw
Any ideas welcome
Brent
2/20/2007 1:28:15 PM by
DaveH
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Malcg
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Posted 2/14/2007 2:22:39 PM
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Brentlord,try disconnecting the throttle potentiometer (red one)also called the idle tracking switch,this is a common fault,failing that if the lamda is switching,the cat is suspect.Cheers Malcg.
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Chris Venning
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Posted 2/14/2007 4:26:22 PM
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Can you disconnect the exhaust immediately before or after the cat, I've got a feeling you might find it's hollow.
I could give up Stella, but I'm no quitter. 
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manicmotors
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Posted 2/15/2007 1:57:23 AM
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Forum Master Technician
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can you measure the temperature pre and post cat?martin
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Chris Venning
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Posted 2/15/2007 3:18:32 AM
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Brent/ Martin, the CAT is mounted immediately up to the manifold on this one, it might be worth dropping it to see if it's intact.
I could give up Stella, but I'm no quitter.
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BrentLord
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Posted 2/20/2007 1:09:03 PM
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Group: Forum Members
Last Active: 1/8/2013 3:31:54 AM
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I removed the cat and nothing inside... After a full new exhaust, emissions were 0% CO on both tests and customer remarked how it smoothed out the power. You can see into the cat if you remove the lambda sensor from the top. Hope this helps someone
Thanks guys
brent
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