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Old 05-28-2013, 08:01 PM   #11
FortWayneFocus
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Took a look at what freeze frame data I could on my code reader, after clearing those 3 codes I got just p0171 to come back after about 25 miles. It's reading 212, 2660rpm, closed loop, stft 9%, ltft 25%, load 25.7%, and 22mph. Oh, and said fuel pressure was 38.5psi. what temp do these motors normally run at? my idiot gauge never moves past 1/2.

After cleaning my MAF several times now, I've noticed the lower filament almost looks charred, I'm going to swap it out with a new one tonight and see how she reacts.
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Old 05-28-2013, 10:46 PM   #12
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To some extent rich and lean can be determined by how fast the sensor switches. Slow switches is generally rich.

The lack of switches is probably due to running lean for too long and either the sensor burnt up or the ECU just gave up trying to fix your screw up.

Larger tube W/O tune, you will always run lean initially. The ECU will compensate slowly up to a certain point. That also means you'll run the exact same amount of fuel, air and spark. Which as you know are all required in equal parts to produce power. Equal amounts of each means no additional power. Which means you need to recalibrate your butt-dyno.


25% LTFT ... there's your proof.
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Old 05-29-2013, 08:22 AM   #13
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Quote:
Originally Posted by iminhell View Post
To some extent rich and lean can be determined by how fast the sensor switches. Slow switches is generally rich.

The lack of switches is probably due to running lean for too long and either the sensor burnt up or the ECU just gave up trying to fix your screw up.

Larger tube W/O tune, you will always run lean initially. The ECU will compensate slowly up to a certain point. That also means you'll run the exact same amount of fuel, air and spark. Which as you know are all required in equal parts to produce power. Equal amounts of each means no additional power. Which means you need to recalibrate your butt-dyno.


25% LTFT ... there's your proof.
Actually if it's leaning out more power should be produced, up to the point of detonation. My butt dyno doesn't need recalibrated, it's a widely known fact. Pulled plugs after a spirited drive this morning, all tan.

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Old 05-29-2013, 08:51 AM   #14
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Not trying to discredit anyone's knowledge here, but sometimes thinking outside the box isn't a bad thing. We all know how shitty information spreads like wildfire on a forum...and just keeps getting regurgitated. Can an otherwise factory original engine, that is completely computer controlled, actually run lean enough to damage anything, especially when no preignition is present, and 93 octane fuel is used?
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