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Originally Posted by jrhudson
I am 100% certain it is not a vacuum leak now. I did a smoke test twice and i could not hear air escaping or see any smoke. I did, however, pull one of the evap lines under the intake manifold to simulate if the smoke would actually be visible from a hard-to-reach area. yes, i could see the smoke coming out from under the intake.
I will look at the upstream o2 sensor tomorrow.
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Ahh, well good to know you're set there.
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Fuel system status 4 is when the HPFP is on, correct?
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No, fuel system status just means warmup (1), closed loop (2), open loop (4). Look at injection mode d4-s, which tells you if you're using PI (1), DI (2), PI + DI (3).
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But I'm leaning toward the fuel pump issue since the AEM 340 pump I have has been sitting in that old fuel. I might switch to the walbro unit if my AEM one is mucked up from the old E85. I have purchased a new fuel filter I'll pull out the fuel assembly tomorrow and i also got a fuel injector tester/cleaner for the stock port injectors im using that were sitting for more than a year.
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I think you're on the right track. I'm going to backtrack on my previous post, you can probably ignore the O2 sensor.
https://datazap.me/u/jrhudson/some-b...1863-1911-1948
To me it looks like the ECU is trying to lean the mixture out every time the injection mode switches from 3 (PI + DI) to 2 (DI). The pattern continues over the whole log, I just marked a short part. I think this would suggest DI is providing the expected amount of fuel, and PI isn't. At least that's the easier one to inspect?
I'm still confused why injection mode 2 (DI only) at idle maintains the high positive LTFT. Maybe there's something special about idle. Hopefully someone else will chime in.
Edit: Are you sure your stock tune isn't scaled for larger injectors?