[alfa] Re: V6 headers and emissions

["Mark Manley" <warpomatic@xxxxxxxxxxxxx>]

On Sun, 11 Jul 2004 21:12:11 +0000, "kloliver" wrote:

>
>Dear digesters;
>
>Just had my 84 GTV6 fail emissions (Mass) after install of CSC headers and a
>pair of new cats.
>Kept the O2 sensor - installed in the bung that came with the headers.
>Headers are ceramic coated.
>
>Sensor is slightly further downstream than in the stock downpipe/cat and
>only on one side, and the new cats are in exactly the same location.
>
>First test was done with Kirshtein modified fuel control and spark box,
>retest was done with stock electronics put back in.  AFM is stock.
>Both configurations gave almost exactly the same results --> CO was 3x the
>limit, HC about 30% over the limit.
>
>Looks like both levels spike only during one of the mid-speed (30 mph?)
>tests, not at idle.
>
>Is it possible that the O2 sensor or cats are not getting hot enough to do
>what they need to do?
>Any other suggestions/experience out there with this problem?
>
>Thanks,
>Kevin Oliver
>84 GTV6
>74 Spider

Kevin,
If I understand right the sensor is only getting the exhaust and heat from one bank
of cylinders? If so it seems natural that it would take much longer to reach operating
temp, if at all. I also wonder about the catalysts. There are lots of varieties of cats so
I hope the seller had experience with your car.

                                    Mark Manley

Tulsa,Ok
'84 GTV6
X1/9 x3
Eclipse GST
--
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided