Quote:
Originally Posted by js335
you are correct, this van is a 99, single bank o2 sensor fuel control for V6/V8 engines went away in the early 90's with OBD1, this OB2 engine is more than capable of making individual bank fuel trim adjustments.
Even so, I've turbocharged many cars before, and the issues you guys are talking about would certainly come into play at high boost/power situations, but not this.
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if it uses individual O2 sensors per bank(and it doesn't necessarily do so, i can think of some V6 applications up to 2005 that use a single pre-cat O2 sensor), it MIGHT adjust bank fueling, or it could adjust all injectors. you'll have to measure injector pulsewidth with an oscilliscope or something similar to see if it does if you can't get into the PCM to verify and adjust it.
and high boost isn't required to see it.... unless you're using a VATN or otherwise gigantic A/R turbine housing, you will ALWAYS have more backpressure than you have positive manifold pressure. even 4PSI or manifold pressure means you'll see at least that between the exhaust port and the turbine housing, which will effect the amount of air going in and out of the cylinder.