This is related to my KR thread, but is a mechanical problem worthy of its own thread:

At WOT my car surges in way that is best describe as a "popping", but there are no registered misfires. I think its a fueling issue. I changed the fuel filter this summer so what else could have gone bad? I'm thinking I should remove the injectors and soak them in gas as a way to clean them.

Thoughts? Where should I begin?

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2009 G8 GT - White Hot


FMS Custom Cam, Yank 3600 SS, 1LE (ZL1) 3.91, SLP Longtubes, Magnaflow cat-back, Rotofab CAI, tuned via HPTuners
415/391

You have been playing with the PCM programming. Do you think there is a relationship?

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2000 SSEi - SilverBullet - 78,000 kms, 4" "straight shot" custom headlight ram air inlet, TOGs, 1.9's, Lsd, 2.9-3.4"MPS 10-15 psi, Ported GenV, EGR eliminated, OR pushrods, oil volume kit, trani cooler & shift kit, Titanium retainers, 90 lb springs, 160 Stat, 42# injectors, Fuel pump voltage increase, Wideband O2, 3" to dual 2 1/2" Magnaflows, Snow Meth/water injection, after SC temp gauge, 255/50WR17, timing commander set 15-18*@WOT, 2 speed Fan over-ride, disabled DRL, Solid motor mount, Meziere Electric water pump, adjustable fuel pressure regulator, Drilled & slotted rotors/ceramics, GXP sway bars and STB, Upgraded and rebuilt transmission with ZZP 2500 rpm stall TC, Pioneer Bluetooth stereo with sub and 800 W amps, PB 13.5 quarter, (April 2014 car of the month)

I backtracked my tuning by a month and still have it.

Sometimes I got WOT and she's happy, but other times I get the symptoms I described above.

I'm thinking FPR, clogged injector(s), or failing fuel pump (no experience with maintenance on the fuel pump ).

EDIT: I see a slight relationship between these "pops" and a slightly stagnant Injector Duty % at the same time.

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2009 G8 GT - White Hot


FMS Custom Cam, Yank 3600 SS, 1LE (ZL1) 3.91, SLP Longtubes, Magnaflow cat-back, Rotofab CAI, tuned via HPTuners
415/391

The only time I have ever heard popping (no surging) is at the track running race fuel going WOT on the 1-2 shift at 6200 rpm

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2000 SSEi - SilverBullet - 78,000 kms, 4" "straight shot" custom headlight ram air inlet, TOGs, 1.9's, Lsd, 2.9-3.4"MPS 10-15 psi, Ported GenV, EGR eliminated, OR pushrods, oil volume kit, trani cooler & shift kit, Titanium retainers, 90 lb springs, 160 Stat, 42# injectors, Fuel pump voltage increase, Wideband O2, 3" to dual 2 1/2" Magnaflows, Snow Meth/water injection, after SC temp gauge, 255/50WR17, timing commander set 15-18*@WOT, 2 speed Fan over-ride, disabled DRL, Solid motor mount, Meziere Electric water pump, adjustable fuel pressure regulator, Drilled & slotted rotors/ceramics, GXP sway bars and STB, Upgraded and rebuilt transmission with ZZP 2500 rpm stall TC, Pioneer Bluetooth stereo with sub and 800 W amps, PB 13.5 quarter, (April 2014 car of the month)

I'm tossing the idea around of a failing fuel pump. It also wouldn't hurt for me to apply new dielectric grease to the coil posts and plugs.

_________________
2009 G8 GT - White Hot


FMS Custom Cam, Yank 3600 SS, 1LE (ZL1) 3.91, SLP Longtubes, Magnaflow cat-back, Rotofab CAI, tuned via HPTuners
415/391