DIY PROMDo It Yourself PROM chip burning help. No PROM begging. No PROMs for sale. No commercial exchange. Not a referral service.
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I would guess the reason the BLM went up higher when you pulled injector wires is because you were shooting huge slugs of air down the exhaust.
when you pulled the plug wire, you were sending ~ 10% fuel down the pipe (displaces some oxygen), PLUS the fuel probably burned at least some of the oxygen in your header primary.
from a different angle: your cylinder #8, and especially #2, don't seem to be contributing much air to your exhaust.
Makes one wonder if there is some validity to (as an engine health test), pull one injector wire at a time, and measure just how much raw oxygen is dumped into the exhaust by each cylinder?
It certainly would look like your cylinder #2 isn't able to pump as much raw oxygen as the rest. then again - i don't know where your o2 sensor was mounted, or what type of manifolds/headers you're using, so maybe there is a distribution issue too (whereever the o2 sensor is mounted, it doesn't "see" as much of #2's exhaust as the rest of the engine).
hmmm
__________________ 1991 Z28
L98/G80/G92/J65
LT1 injectors, DIY PROM, t-56, AS&M siamese runners, accel intake, F1 GS-D3's
* 14.46 @ 93.36mph, 1.98 60' 7/5/02 (stock)
* 14.89 @ 96.76mph, 2.51 60' 7/7/04 (T56, AS&M SS runners, accel intake)
...guess I need to work on that rear suspension! 1971 RS
406/4spd...a work in progress..
in the 13's @ 107mph without a posi, it's a start.
Number 8 may be just as good as the others and is masked by the #4 exhaust pulse that occurs just after it (and vice versa, and same on 5, and not sure why 7 didn't, but who cares).
#2 still looks 90% dead. Does the injector click? That plug wire shoots out a spark, right?
The O2 sensor has a little bit of catalytic reaction going on, and the air fuel could be burning in the exhaust a little still - ignited by other exhaust, etc, which could exlain the plug wire results.
