Join Date: Jan 2009
Location: Avon Lake, Ohio
Biggest change will be fueling, and possibly the spark. If the fuel tables are too rich or lean for the timing/RPM then there will be a miss. Usually though the fueling at cooler temps tends to be rich. So that's my guess - too much fuel in open loop. Data verification should immediately clarify this though.
As soon as it switches to closed loop, it runs at stoich, so unless there are issues with the O2 sensors, vacuum leaks, or other various mechanical deficiencies, fueling issues usually go away at this point.
97 Laser Red Thunderbird LX 156k,
Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58
| Build details | Pics at the Lorain Assembly plant
96 Ivory Mark VIII 235k
, stock 4.6 32v on coils; New engine at 185k
Gone but not forgotten:
94 Cougar XR7, 93 Mark VIII
TCCoA's resident pilot since 2014
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