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JBurer JBurer is offline
Registered User
Join Date: Nov 2008
Location: Austin, TX
Posts: 205
Update - testing this morning. Another fail, but I got results this time. Can't believe how close I was to passing, and how much margin I had on most of the tested areas.

2500rpm Test
Reading Allowed Result
HC ppm 46 220 Pass
CO % 0.41 1.2 Pass
RPM 2479 2750 max
CO+CO2 15.7 6.0 min

IDLE rpm test
Reading Allowed Result
HC ppm 223 220 Fail
CO % 0.32 1.2 Pass
RPM 976 1250 max
CO+CO2 15.4 6.0 min

I think my problem is that idle oscillates slightly, causing AFR's to bounce a bit. Advanced timing some (to 22 adv), but the idle is a bit rougher... retard timing (to 10 adv) and it smooths out.

Since coming home, I leaned out the idle further to the 15's... this should help some... but do you think I should advance the timing at idle (which is supposed to result in a more complete burn but causes oscillation in the idle) or retard it (which smooths the idle out)?

Last edited by JBurer; 10-10-2009 at 12:40 PM.. Reason: can't format table!!
Old 10-10-2009, 12:35 PM
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