Car is not running right. Rough idle and misfiring under acceleration.

SG4247

Bought time for a leak down or compression test...

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NA on E85 - 12.669 @ 110 mph (stock fuel pump)
100 shot E85 - 11.589 @ 117 mph (DW fuel pump)
JWT C2 cams rev Base Circle & Titan Valves

Wilson2608

Yeah that’s what I’m concerned about ... it’s just weird because sometimes the car pulls strong all the way to redline and others it jerks and misfires the whole way. Motor has 120k miles on it. I contemplated doing a compression test while the plugs were out but I didn’t... guess I’m about to do that next. Fingers crossed

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

Wilson2608

Well just did a compression test and it was good. Lowest cylinder was 230 and highest was 240ish. It’s going to Nissan maybe they can figure it out. Car is running worse after I replaced spark plugs. At this point I’ve done everything In the book. I have heard about a dual mass flywheel causing misfiring issues. No idea how but I did see that somewhere. I’m at 120k and have never touched the clutch..

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

Blkmrkt

Tried checking the battery and alternator? Maybe voltage fluctuations are causing issues with sensors/computers?

AyoMykey

Sometimes in these cars around your age the fuel pump is able to produce adequate fuel pressure for idle, but not able to produce enough volume for driving conditions. Checking fuel pressure while accelerating in gear to full throttle will show a fuel gauge that drops from 55psi down to 40 or below. It can also be monitored using the rear 02 sensors if you have a scan tool

Wilson2608

Took it to Nissan and they pretty much chalked it up as the fact I have modified the vehicle. Complete waste of time ..

Anyways, new code is engine signal 1. Ecm fault or abs module. Gunna look into that a bit deeper. If that doesn’t work I’m going to replace all of the coil packs. If that doesn’t work I’m driving it into the nearest lake and calling it a day. I’ll keep y’all updated

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

Wilson2608

I replaced battery to be sure. That was not it sadly. Volt meter is reading good but I’ll have the alternator tested as well. Thanks for the advice

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

sportsman2003

Not saying that this is your issue but....I had a twin turbo 3000GT that would do the same thing as you are describing. It turned out to be bad a MAF sensor.
The car would run great then start bucking then run great again it was so intermittent it drove me crazy. I was super excited when it was repaired though.

Good luck with it. I am sure you will get it sorted.

Wilson2608

Thank you, I’ll check that out. I’ve cleaned them a couple times but I have not replaced it yet. May give it a shot if the coil pack doesn’t work.

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

Wilson2608

I do have a scan tool. I’ll check that as well. Thanks !

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

ToyKiller

Hey OP.. I’m chasing the same demon on my ‘07.

Any luck ironing this out?

I have a donor car (death kart) that still has cats on it because I’m lazy.. going to swap the drivers side cats tomorrow......

My ‘07 motor is stock other than CAI and Stillen Catback so the motor/ECU should think it’s stock.

Intermittent rough idle and after driving for a while a P0430 code, but the freeze frame picks it up at highway cruise speed so I’m thinking misfire.. coil or injector.

When idling ... Odd thing is when I watch the bank 2 AFR (sensor 1) it hovers around 0.8V until it starts misfiring/rough idle and the reading goes up above 1.1V then it corrects and goes back to normal string 0.8V. That would suggest that the engine is running rich when the idle gets choppy, so bad coil is the likely culprit since the plugs are new .

Frustration .....


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Bryans_3

Did you ever find out what’s wrong with your car because it looks like I’m having the same issue.