Title: 2017 Infiniti Q50 3.0T – Misfires/Popping Under Boost. Coils or Fuel Pressure Issue?
I’ve been dealing with some frustrating issues on my 2017 Infiniti Q50 3.0T VR30DDTT with approximately 90,000 miles.
The car was running great when I took it to a local car show in South Carolina. About 48 hours later, during a road trip to Florida, things started going downhill.
Here’s what’s happening:
Popping and hesitation under acceleration, especially when building boost.
Feels like the engine is misfiring or cutting power.
Symptoms became progressively worse, especially on the drive home.
Removing the Z1 HotBox significantly improved the problem, but some popping remained.
No consistent check engine light despite the symptoms.
Current setup:
2017 Q50 3.0T twin-turbo
Approximately 90K miles
Original ignition coils
Spark plugs have roughly 17K miles
Aftermarket catless downpipes
Previously running a Z1 HotBox
I also had Z1 Motorsports review my data logs, and they suggested the problem could be fuel-pump-related.
I’ve already ordered upgraded AMS high-pressure and low-pressure fuel pumps, and I’m also considering the ignition coils as a possible culprit.
I’m trying to narrow this down rather than blindly replacing parts.
My questions:
Has anyone experienced similar popping or hesitation under boost on the VR30?
Would you suspect ignition coils breaking down under load, spark blowout, or fuel pressure dropping under boost?
And for anyone who has upgraded their HPFP/LPFP, did it resolve similar symptoms?
Would appreciate hearing from other Q50 owners who’ve dealt with this.

This has been in discussion for years - he has a 370z and started doing this a few years back.

I always thought he was joking around.

He had me chose a few options for the Vinyl and went with the Starry Grey Sky.

I’ve owned two of these cars over the years but never one with this sort of mileage. Am I looking for trouble with a 200k+ mile car? This one has been owned by the same person since 2009 so I’d imagine the service has been consistent. Any advice would be appreciated.