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Forced Induction Turbo, Supercharger, Methanol, Nitrous |
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12-03-2017, 11:54 PM | #15 |
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I'm having similar issues, but its moreso when I'm on higher ethanol content, cruising on low rpms. Weird part is that the issue comes and goes but doesn't happen on 91.. its got a mind of its own
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12-05-2017, 06:16 PM | #16 | |
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Can you log the car? Where is the FF connected to (Rear O2 or CPC)? If the O2 sensor port I'd check the AF#3 correction values in the log.
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12-05-2017, 08:16 PM | #17 | |
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I suppose on a supercharged car where boost should always (assuming everything is working fine from a mechanical perspective) be the same amount it would be less of an issue...but I would still be weary.
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12-05-2017, 09:30 PM | #18 |
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I have the PTuning FF kit.
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12-06-2017, 03:45 PM | #19 | |
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12-06-2017, 03:55 PM | #20 | |
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That makes sense. I'm from the turbo world, I've maxed out every MAF I've ever had and had to run hybrid MAF/MAP setups.
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12-24-2017, 03:11 PM | #21 |
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Update:
Changing the spark plugs alleviated some of the issue. The plug gap was worn out. It would hesitate at anything above 50% throttle. Now I'm having the issue at the higher RPM range, always at 6.5k rpm, the car hesitates and wont go. I've cleaned the MAF sensor which I haven't cleaned ever (lol) and got the same results. I have a vid below. [ame="https://www.youtube.com/watch?v=482kHy7oUJo"]Boost issue 1 - YouTube[/ame] [ame="https://www.youtube.com/watch?v=sQJkR8Cv5T0"]Boost issue 2 - YouTube[/ame] The 2nd vid hesitates at 6k which it doesn't do often. My tuner said it wasn't the MAP sensor. I haven't swapped to test as yet though. So the list of possible issues: MAP sensor O2 Sensor Vac Leak? Coil Packs? What other possibility? Other note is my engine has 150k miles on it. The issue did start until 145k miles.
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12-24-2017, 03:35 PM | #22 |
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Does your tune include FFS? I have an OFT (NA) but I set FFS RPM too low and I got weird high RPM shifting issues. Just a thought.
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12-24-2017, 04:52 PM | #23 | |
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Edit: My dad’s GMC 2500 cut out power and went to limp mode. I sounded like the turbo was bypassed. The truck would not go faster than 45mph or rev as high. He changed a clogged filter, and it immediately fixed the issue. I think you have to ask yourself what could have changed? Bad fuel, low fuel pressure, bad afr, bad spark or bad compression. Bad afr could be a header leak, a clogged cat, a boost leak, a bad o2 sensor or something but I can’t imagine you would see any of these problems with no CEL. |
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02-05-2018, 10:38 PM | #24 | |
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I'm not sure if I have a clogged filter. The car runs a lot worse on pump gas than E85 which tells me it's probably a fuel compensation issue. :/
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03-02-2018, 11:02 PM | #25 |
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Update. It was just cylinder 1 coil pack that went bad. Nothing major. Car is running fine again. Thanks for all the help all.
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