Any input helps
My car is having issues and stalling out.
I pushed it to around 5k and the car begins to bog down. It stutters for a second then shuts off. I was able to pull over, when I went to restart it...it cranks but does not turn over until I let go of the key. Then as I begin to accelerate it sputters and stalls.
If I let it sit for a while then I will be able to drive at low rpms perfectly fine...
Does anyone have any suggestions. I have already changed the crank sensor and both cam sensors.....this is killing me

 

We need year of the car, miles, transmission and color of the car.

As much info as you can give. SPECIALLY CEL CODES.

I would say that the fuel filter or pump could be a good point to start. As you increase the RPMs, you need more fuel. If the filter is clogged or the pump weak, you will not get the needed fuel for the amount of air entering the cylinders.

 

03, 71k miles, 6mt...........lol color? PPW
No codes yet, thats the more annoying part. Stock fuel pump, thinking that could be the issue. Been meaning to upgrade to the walbro 255 anyways thinking now is a good time.

 

Connect a computer to the car anyways. Not all the codes trip the light.

Have you done the maintenance to the car recently?

Fuel filter?
Spark Plugs or wires?
Air filter?

If you havent done any of those, you will have to do them anyways, so it would be a good start.

Car needs air, fuel and spark to run. The faster the RPM, the more load you are putting on this three items. And I guess one of them is lacking.

 

fuel pump most likely.

 

Was able to plug in a computer today anyways. It threw no codes.
Oil change done 1k miles ago.
Spark plug changed last summer about 12k miles ago.
Doubt it would be the fuel filter. I'm going to order a walbro 255 soon to see if that helps.

 

I had a bad ignition coil around that mileage, Dave from F:T found it and swap it out. But it wouldn't stall, it would make more of a chewbacca sound with a misfire.

 

The 350z only have an in-tank fuel filter.

 

Oooh, so it is a returnless fuel system then?

 

vacuum line pinched or broken = vac leak = random stalling

maf coupler loose? try some electronic cleaner on the maf, it may have gotten dirty and its not reading correctly

upgrading to a 255 walbro is pointless if you dont need it.

 

I had a similar issue: ended up being a loose coupler on the intake pipe that blew off under boost. It happened to me a second time as well, but that's because the fan chewed up a rubber line causing a vacuum leak. Another one of my friends w/ a Greddy kit hit boost so hard that the coupler on his FMIC blew off and caused the car to stall and not start up.

I wouldn't go buying parts just yet esp if you don't know the root cause of the issue - you'd just be wasting money.

Slim had a similar issue w/ his JWT turbo'd Z, it ended up being bad coilpacks. (he also has an 03)

There can only be 3 possible things:
Air - any vacuum leaks?
Spark - coilpacks/spark plugs/plug wires all in good shape?
Fuel - system clogged? pump failure? injectors need cleaning?

 

Could be a cam sensor as well....my car likes to break them. It does roughly the same thing...

 

Things to check...

Post maf leak....or dirty Maf (but you should get a code from them)-most likely cause though.
Crank sensor
Cam Senor
Plugs (shouldn't stall if only one is fouled)
Fuel Filter
Fuel Pump
Possible fouled injector (still probably wouldn't stall)
Coils (mine doesn't stall when I break them.....just runs like poop)
Actual hardware issue with the ECU (Unlikely)

 

Thanks for the input
Update.=: Seems to only bog down then stall out on WOT. Can drive normally perfectly fine
Here is what has been done/checked
Cam sensor, both banks
Crank sensor
Throttle body cleaned
MAF sensor checked and cleaned
No vacuum lines leaking or damaged
Spark plugs/ wires/ coil packs all good and working.
And no CEL...
btw greddy tt on emanage

 

I'm not a fan of emanage, but that doesn't mean it is the problem.

 

Been meaning to get retuned anyways with some other things installed. Thinking of taking it up to Frank next week

 

My bet is on the coilpacks

 

Well i visually inspected the spark plugs and the wires...
As for the coil packs im going to swap with my friends for a day next week and see what happens

 

You do not check the coil packs visually. You check the voltage that they are putting out.

Although, I still think is a fuel related issue. But I do not know what could cause a big enough problem that the car actually stalls on WOT.

 

Sorry on WOT it boggs down and studders then once i let off and begin to coast it stalls