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Chris(aka-Moose)
Chris(aka-Moose), Nissan Technician
Category: Nissan
Satisfied Customers: 598
Experience:  16 years of experience
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I have a 350z with itbs on it as of late the car bogging

Customer Question

I have a 350z with itbs on it as of late the car bogging down and cuts out because of fuel starvation when turning left and some times when flooring it way?
Submitted: 1 year ago.
Category: Nissan
Expert:  Jay replied 1 year ago.

Hi, My name is*****'m happy to help you. During our conversation, I may be presenting you with different things to try, and ask you some Questions to get a better understand of the issue so I can answer your question properly. So stick with me to the end, and I am sure we should be able to get this issue resolved for you!

Do you have a scanner to monitor the fuel trim readings? Also, do you have any Mods to the car? K&N air filters or cold air intakes or something?

Let me know..

Customer: replied 1 year ago.
I have an air fuel gauge and I am running open itbs
Expert:  Jay replied 1 year ago.

ITBS... Intake Throttle Body Spacer?

Customer: replied 1 year ago.
Individual throttle bodies
Expert:  Jay replied 1 year ago.

They had duel throttle chambers on the 2005?

Is the car all stock?

Customer: replied 1 year ago.
No single throttle and no car is modded
Expert:  Jay replied 1 year ago.

What Mods does the car have?

Expert:  Jay replied 1 year ago.

If you start the car and warm it up, at idle, what is the short term fuel trim readings (STFT ) or Alpha?

Customer: replied 1 year ago.
Cams, pistons ,con rods ,headers to exhaust full system , fuel pump and the itb,s
Expert:  Jay replied 1 year ago.

oh wow.. Ok, this is a completely mod'd car...

Is this setup for racing? Ecm Reflashed? Is the fuel tank Sumped?

Expert:  Jay replied 1 year ago.

did you put in bigger injectors also?

Customer: replied 1 year ago.
750cc injectors and I am running a stand alone for ecm, I don't know what you mean by fuel tank being sumped
Expert:  Jay replied 1 year ago.

It sounds like this is heavily mod'd. A sump tank put a low spot at the back part of the tank so when on heavy acceleration, the fuel will all go to the back of the tank to the fuel pump so it can pump fuel properly. If you leave the factory setup, depending on level of gas, if you accelerate hard it pulls all the fuel away from the pump

Customer: replied 1 year ago.
OK now fuel sump since I had the car finished it was running fine until as of late the car boggs when making left turns and the air fuel gauge reads lean
Expert:  Jay replied 1 year ago.

How much gas is in the car right now? Also did this start out of the blue?

are you using factor MAF sensors? Do you have MAF sensor cleaner?

Customer: replied 1 year ago.
OK no fuel sump. Since I had the car finished it was running fine until as of late the car boggs when making left turns and the air fuel gauge reads lean
Customer: replied 1 year ago.
Actually I am not running any maf I am running only map and yes it started out of the blue and has gotten worse
Expert:  Jay replied 1 year ago.

Ok.. So no MAF sensors so the software is totally not factory also...

How much gas do you have in the car?

Customer: replied 1 year ago.
Full tank thought that would help but hasnt
Expert:  Jay replied 1 year ago.

What grade fuel? Super / Premium? Do you have this car setup for pump gas?

Customer: replied 1 year ago.
setup for pump gas and only use premium
Expert:  Jay replied 1 year ago.

This one has me thinking. The car is more or less far from stock. This may require a tune to the Ecm to re-balance the fuel trim