Running rich Options

[schmooot]

Pretty new to the turbo world. Only mod is the Berk downpipe on otherwise bone stock 3rd gen engine, running 12psi according to my gauge. Runs, idles and goes just fine.....just smells rich to me, exhaust tip is a little on the dark side too. Is it normal behavior or what? where do I start my troubleshooting?

This post has been edited by schmooot: May 2, 2013 - 12:34 AM

[presure2]

the 3rd gen is setup to run pretty lean till about 4k rpm, then gets quite rich, so if your doing alot of boosting, then yea, i would expect it to be rich, especially running stock boost.
if its running rich all the time, then that is not normal, i would start by checking the o2 sensor, since that controls closed loop a/f ratio for the most part (basicly anytime your not in boost)... vac leaks, or exhaust leaks around the o2 will also affect it as well.
also make sure the hose from the map sensor to the intake manifold has no cracks or leaks, and isnt being tapped into for anything. (the map sensor is a big part of how the engine controls fuel and timing, so you dont want to interfere with that hose at all, as it could affect timing and or afr.)

[schmooot]

the 3rd gen is setup to run pretty lean till about 4k rpm, then gets quite rich, so if your doing alot of boosting, then yea, i would expect it to be rich, especially running stock boost.
if its running rich all the time, then that is not normal, i would start by checking the o2 sensor, since that controls closed loop a/f ratio for the most part (basicly anytime your not in boost)... vac leaks, or exhaust leaks around the o2 will also affect it as well.
also make sure the hose from the map sensor to the intake manifold has no cracks or leaks, and isnt being tapped into for anything. (the map sensor is a big part of how the engine controls fuel and timing, so you dont want to interfere with that hose at all, as it could affect timing and or afr.)

ummm I feel foolish, I'm a good mechanic but very very new to FI. It just smells rich at idle...can't say I noticed anything when she goes...usually just trying to keep it on the road. My boost gauge is teed off of a line....don't know which one. It was right by the firewall, maybe at the turbo pressure sensor. I followed a how-to article somewhere...probably gt4oc or gt4ec or gt4dc.co.uk. Can't seem to find it again. Sadly I don't know what half the lines are for in that beast. Please educate me.


As for the wideband sensor. I believe I have a bung for it in my dp already, I just assumed it was for running some sort of aftermarket engine management thing, didn't really plan on doing much upgrading...can barely afford to just maintain. Do I just unplug my factory O2 and plug the harness into the wideband one in the other hole? Or is there much more to it than that?