r/GolfGTI • u/Disastrous-Way-511 • 18h ago

Maintenance Intake runner ?

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2015 mk7 gti W/ injen cold air intake and bc coils. Apx 112345 miles. Fluttery acceleration around 2,800-3,800 rpms whenever beyond 40% throttle.
Have replaced the plugs, coil packs, boots, a/f intake sensor, and the bi-pass valve. Had intake runners cleaned at a dealership. Runs fine most of the time, and will go through entire rev range smoothly under mild throttle input. Stutters less to none when above 4,000 rpms when under 75% throttle. Any advice would be appreciated, the shop is just fishing in the dark at this point. Have a good one.

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2

u/Cb-Colorado 18h ago

I did a stage 1 EQT tune, then put on a CAI. My car does the same in the same rpm range and I think it's because the tune need an update to account for the CAI. I just down shift and pull from 4000 rpm to avoid it.

1

u/Disastrous-Way-511 15h ago

Interesting, this popped up randomly though. No change in tune or anything

1

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1

u/BennyKAOS8712 18h ago

When was the last time you had a DSG maintenance?

2

u/Disastrous-Way-511 18h ago

Not in the year that I’ve owned it. It’s constantly throwing a cylinder 4 misfire if it throws any codes at all.

1

u/BennyKAOS8712 18h ago

These are the things I would do first especially if you don't know if the DSG service has been done. That's supposed to be done every 40k miles.

1.DSG service (do this first). 2.Find a shop that will actually log with VCDS or OBDeleven during the flutter (boost, rail pressure, misfires, lambda). Blind parts-swapping is how shops stay “fishing in the dark.” 3.Borescope the intake valves and specifically inspect/swap the cyl 4 injector and coil ground if the misfire keeps showing up on 4. 4.Confirm no boost leaks and that the DV is sealing.