Hmmm, my 66 (when it was still required to be tested) used to pass the CA
idle (1200rpm max) and 2500 rpm tests, and it had no smog gear at all. The
CO limits were 5.5% and 4.5%, respectively, but my last test report from 97
showed me at 3.8 and 1.8, so it was in the ballpark for your requirement. So
I would think it's possible.
Besides the steps you mention, my strategy was to go to a drive-in test
facility that was 10-12 miles away, so the car was good and warm, and had
had a blast of freeway driving since last using the choke. If there was a
waiting line, I'd shut it off so it wouldn't be idling for an extended
period. I'd also run premium fuel. There are probably some other tuning
tricks, but I haven't had to go through this for some time (thank goodness).
on 5/6/02 3:00 PM, Mike Janacek at mjanacek@snet.net wrote:
> Listers,
>
> Car specs: '79B with rebuilt non-biased HS4's. No cat (obviously).
>
> Last week: Car failed on CO percentage (5.06 percent). My CO meter showed only
> 2 percent at idle although state does a rolling road test. Airpump frozen. HC
> and NOX readings were very low. State allows 3.56 percent CO max.
>
> This week: After consulting various MG related archives, it appears that an
> airpump would lower the CO. Installed new rebuilt airpump after roto-rooting
> the air-rail and head ports. Check valve OK. Timing good and carbs leaned out
> about as much as I dare. Valve clearances set up normal.
> Failed on CO again (actually a little higher) and again HC and NOX were low.
>
> OK, what are my options, if any, other than going back to the ZS (yep, I still
> have it all, but REALLY don't want to change back!)?
>
> Mike
> '79B
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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