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07-11-2019, 05:50 PM | #15 |
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You guys need to log afr, commanded afr , maf, manifold pressure, throttle , rpm , pprt amd direct injector pulse widths. Stft, ltft so you can see ehats going on.
High positive ltft at low rpm indicates intake or exhaust leaks, cracked header or similar High negitive trims, often dirty maf sensor or oil on maf sensor Afr cycling between very rich amd very lean like 11 to 15 fairly quickly at idle can be failed 02 sensor But you need to log and confirm |
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09-14-2019, 10:39 AM | #16 |
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Same issue here, did u figure it out?
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08-27-2020, 07:42 AM | #18 | |
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Everything stays normal ish at cruising speed |
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08-28-2020, 11:19 PM | #19 |
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I had a week or so where my fuel trims would go to -29%, car ran fine otherwise.
I pulled the MAF to clean it but it was spotless and bone dry... didn't do anything to it. i reinstalled the sensor and like magic my trims went back to +0-3% Hasn't happened since.
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08-29-2020, 07:42 AM | #20 | |
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So I cleaned the air filter, maf, map and TB all at one shot and it seems to have cleared up. Nothing looked perticularly dirty, but the issue seems to have gone away. ¯\_(ツ)_/¯ |
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09-06-2020, 12:37 PM | #21 | |
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I was turbocharged too. AFR was super rich because spark wasn't firing due to bad coil pack. |
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01-07-2021, 06:06 PM | #22 | |
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Were you having any notable running issues other than the super negative fuel trims? Like if you didn't have the ability to datalog would you have had any reason to assume there was an issue? |
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bogging, bucking, high fuel trim, high pitch noise |
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