Brad Bartilson
New Member
- Joined
- Feb 2, 2002
I Failed the IM240 test again (here in CO, high altitude)-High CO (9.0 vs. 3.0 limit) and HC (47 vs 20 limit) indicating too rich.
So far I've:
-installed a new GM 02 sensor (much more active than the Bosch)
-tried higher and lower fuel pressure (I have 009 injectors)
-installed a new 70mm throttle body (no leaks)
-tried everything to get leaner, to no avail (LS1Maf/translator plus on leanest position). Don't see any difference on EGT's.
I had the engine rebuilt a year ago, have 5K miles on it. I still blow smoke at 20psi. At 2.5K miles on the rebuild, I installed high flow heads, still saw the honing marks in some areas on the cylinder (Hastings moly rings). My compression checks are good. A leakdown check showed 12%. The leakdown check shows only "fair-poor" sealing past the valve seals. I use a quart every 1k miles.
Question: Could my oil consumption be the reason my EGTs are low and the high emissions. If it is going by the valve seals, would venting it to atmosphere get me by emissions (right now I have the passenger side vented into the intake)? If it is going by the rings, would this also help? Would plugging the EGR reduce the emissions by increasing my EGTs?
all help appreciated.
Brad 87TR
So far I've:
-installed a new GM 02 sensor (much more active than the Bosch)
-tried higher and lower fuel pressure (I have 009 injectors)
-installed a new 70mm throttle body (no leaks)
-tried everything to get leaner, to no avail (LS1Maf/translator plus on leanest position). Don't see any difference on EGT's.
I had the engine rebuilt a year ago, have 5K miles on it. I still blow smoke at 20psi. At 2.5K miles on the rebuild, I installed high flow heads, still saw the honing marks in some areas on the cylinder (Hastings moly rings). My compression checks are good. A leakdown check showed 12%. The leakdown check shows only "fair-poor" sealing past the valve seals. I use a quart every 1k miles.
Question: Could my oil consumption be the reason my EGTs are low and the high emissions. If it is going by the valve seals, would venting it to atmosphere get me by emissions (right now I have the passenger side vented into the intake)? If it is going by the rings, would this also help? Would plugging the EGR reduce the emissions by increasing my EGTs?
all help appreciated.
Brad 87TR