Sorry for the delayed response. We dropped the tank, as the shop said the problem was somewhere on top of the tank. They wanted more $$ for diagnostics, and didn't have availability of parts anyway, so I took it back to PSR.
We dropped the straps to the tank, and the tank wouldn't come down! That's when we realized the likely issue. Got the tank down, and there was a nice rivet hole in the top. Last year, put in some steel plate to reinforce the rusted floor. Unfortunately, one of the rivets went through the top of the tank.
Thanks to Dumptruck for dropping everything, and running up to PSR with a spare tank he had. We swapped the tank, verified the evap valves worked and the grommets were decent, gooped them up with sealant, and put them back together.
A few days later, and back to Ridgecrest for the test. Gomer passed both emissions and evap with flying colors.
Just for reference, here are the numbers:
1st pass - after driving 78 highway miles, and then 2 hour cool down
Idle - %CO2: 13.88 %O2: 0.9, HC (ppm) Max 100, Aver. 17, meas 7
2500rpm - %CO2: 14.06 %O2: 0.6, HC (ppm) Max 170, Aver. 13, meas 14
%CO in both cases was 0.00
2nd pass - after driving 78 highway miles, and pulling in immediately:
Idle - %CO2: 14.40 %O2: 0.2, HC (ppm) Max 100, Aver. 17, meas 11
2500rpm - %CO2: 14.30 %O2: 0.4, HC (ppm) Max 170, Aver. 13, meas 12
%CO in both cases was 0.00
So, a stroker can burn quite clean. In addition, if you have a marginal test result, you may get some improvement getting on the tester immediately after an extended drive and at full operating temperature.
David Bricker / SYR