Header glow

What are you driving Clyde?

Sorry,
'83 308GTB qv

I'm back. What exhaust CO should I have? I am getting 1.05 at 2500 RPMs
As always, Thanks.

1.05% CO is well within range...

what is idle CO reading?

At 1500 RPMs the CO is 1.22. The readings were taken for my FINAL(25 yrs. old) emissions check

Hi Walt,

the readings are well within spec on the CO side... do you have any HC numbers?

Regards, JRV

2004 Emissions
HC @ 1500 RPM 84
HC @ 2500 RPM 135

2003 Emissions
HC @ 1500 RPM 49
HC @ 2500 RPM 56
Same inspection station, different machines. If that matters.

Walt,

are these readings after the cat?

if so (which I didn't realize based on CO #'s) then I would say 1.2-1.5 is on the pretty rich side...if you have No Cats or these numbers are Pre-Cat then they look good.

Regards, JRV

JRV I do have cats & the readings were taken after them.
Here is everything I have:
........25/25 Test................50/15 Test
HC ppm......84.......................135
CO%........1.05......................157
NOx ppm.....48........................42
RPM.........2315.....................1500
CO+CO2......15.6 .....................0.1

Sorry I don't know exactly how these numbers relate to tuning my engine but I'm learning.
As always thanks!

Hi Walt,

the HC #'s tipped me off the exhaust was being checked after the cat.

You would be better off if you could see CO in the range of .04-.07 at the tailpipe...instead of the above 1.0 numbers you presently have...I would sispect pre-cat the CO is 2.0 or higher which is a rich running condition. The HC numbers indicate you are firing on all 8 with no mssfires of note.

Regards, JRV