johnand1
03-08-2016, 05:22 AM
92 k1500 auto, swapped in a 7747 ECM
Newly rebuilt 350 TBI w/ TB mods like salad bowl & injector spacer, trickflow heads, bigger cam (not crazy tho, cam is efi compatible), flow matched rebuilt injectors, and more.
I'm basing ECM off of the ASDU bin/PROM.
Base timing at 0.
Engine compression test, cold, ~170 psi.
Vacuum test, solid 15 inches at idle w/ slight fluctuation.
Fuel pressure at TB (with new fuel pump), solid 12.5 psi.
New MAP sensor, cleaned EGR valve, new IAC.
ACDelco R44LTS plugs.
I have a wideband O2 and ALDL logger. Both are showing that i'm running way rich, pretty much across the board. Other than high RPM which is just a bit rich. During cold start/open loop I can smell fuel in the exhaust and I can see soot on the spark plugs. Its pretty bad. I don't get it, I should be pumping way more air through this engine. I don't want to lower the fuel pressure. What is the best way to lower fuel amount in the PROM?
Newly rebuilt 350 TBI w/ TB mods like salad bowl & injector spacer, trickflow heads, bigger cam (not crazy tho, cam is efi compatible), flow matched rebuilt injectors, and more.
I'm basing ECM off of the ASDU bin/PROM.
Base timing at 0.
Engine compression test, cold, ~170 psi.
Vacuum test, solid 15 inches at idle w/ slight fluctuation.
Fuel pressure at TB (with new fuel pump), solid 12.5 psi.
New MAP sensor, cleaned EGR valve, new IAC.
ACDelco R44LTS plugs.
I have a wideband O2 and ALDL logger. Both are showing that i'm running way rich, pretty much across the board. Other than high RPM which is just a bit rich. During cold start/open loop I can smell fuel in the exhaust and I can see soot on the spark plugs. Its pretty bad. I don't get it, I should be pumping way more air through this engine. I don't want to lower the fuel pressure. What is the best way to lower fuel amount in the PROM?