Hello,

My 370z has been giving me issues for a month or so now. It started off with:
-Power loss under high acceleration. (RPM climbs fast like normal, and then seems to hit a limiter like wall and refuses to accelerate more or just accelerates really slow while sounding like it is stuck at a limiter)
-Occasional rough idle
-Longer than normal crank time to start, sometimes it would sound like it was bogging while starting.
-Would drive rough for 10 or so min before clearing up.
-Bogging when going from stopped to first gear.

The car then stalled on me while I was out, and refused to restart. Would crank fine, but nothing else.
-I went and got my truck, towed it home.
-Ran some diagnostics, figured it was coilpacks going bad. (103,000 on odo)
-Ordered Z1 high energy coilpacks.
-Tried starting the car up again before coil pack install. It started up fine, no issues. Ran great until I parked it.
-Figured I might be fine, went ahead and tried driving again, but when I started it up again once it was hot, it wouldn't work. Same issues.

Figured it was the coilpacks getting pissed off once they were hot, so I swapped em out as well as New Spark Plugs.
-Drove great for about a day, the bogging when going from stopped to first also appeared to be gone.
-Drove it the next day, worked great until about an hour or so of driving when all of the original issues came back.

I used a scan tool to look at Cam Postion sensors, those also seem to be fine. RPM doesn't drop to zero when i start it, so figured Crank Position sensor wasn't an issue either.

At this point I'm leaning towards MAF issue, dirty Throttle Bodies, or a weird issue my friend suggested. He said it could be the Brake Switch intermittently being on causing the car to limit power and possibly stall.

Let me know if you have any ideas on what I should do. I have built a few 350z drift cars and manual swaps, but my diagnosis knowledge is severely lacking.

Thanks

 

Based on the symptoms, my initial reaction is to put the blame on crank or cam sensors (long crank start, lack of power in the higher RPM range, rev-limiting/bogging, & stalling), but that could just be more of a 350Z specific issue which I'm more familiar with.

Doing some quick searches, it looks like it's common for 370Zs to have VVEL issues. But there are many things that can cause this type of symptom. It could be a dirty MAF, vacuum leak(s), exhaust leaks, fuel delivery issues, or something related to ignition timing like cam and crank sensors. In rare cases there's some mention of low PS fluid or faulty coolant temp sensors causing similar symptoms. Sometimes a simple throttle position/idle relearn will solve issues like this.

I do not recommend using aftermarket coil packs. These engines are very particular about their ignition system electronics, stick with OEM.

Have you tried scanning for codes, were there any active or pending DTCs? I know you mentioned looking at the CAM sensors, I assume via live data. But if your car is having symptoms like this, it should have triggered a fault code somewhere that would give you some clues.
Cheers!
-Icer