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Possible Fuel Cut?

hrr31

By hrr31,
in Four Door Family & Wagoneers

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hrr31 Enthusiast

hrr31

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Posted

Hi everyone, i have a 1999 nissan stagea rs4 rb25det neo 5 speed manual and having some issues! the car idles fine and revs fine when stationary but when i attempt to drive the car it hits fuel cut under any amount of throttle, iv gone over and checked for vacuum leaks everything appears good car is running standard boost it cuts out even before it reaches boost what could be causing this? crank angle sensor? airflow meter? when the car cuts out it doesn't stall just cuts fuel and wont allow me to accelerate doesn't back fire or sound like a misfire any help would be greatly appreciated.

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66yostagea Grand Master

66yostagea

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Posted

If your running FMIC check for leaks, split or dislodged hose etc. Check the AFM connection and give the AFM a good squirt of throttle body cleaner, also do the TB

It sounds like its in limp so could be any of the above. Our C34 N/A went like that and it was the timing belt. The tensioner had seized and laminated the belt which jumped a couple of teeth. This threw the car into Limp.

hrr31 Enthusiast

hrr31

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checked and cleaned everything all intake hose's tight and not leaking still doing it could it be the turbosmart bov im going to chase up a standard bov and try that if that doesn't work would the CAS cause this issue. it will rev fine in neutral with out any issues and idles perfect like there is no leaks only does it when i try and drive. ( Anyone got a standard BOV in Brisbane want to swap or sell for cheap or free ) i cleaned out the fuel filter also seems fine :(

QWK32 Veteran

QWK32

Posted
Posted (edited)

when you say it cuts out do your mean it just feels like its being held back, or the engine literally cuts out for a second? if it just feels like its holding back you could be onto something with the bov, possibly leaking? faulty AFM will cause poor performance as hugh mentioned. if your getting a full engine cut it could be a faulty map sensor causing the ecu to think you've over boosted.

i'm in brissy and have a stock bov your welcome to have (for free) if you want to come and get it. i've also got a consult cable and software i can hook up to the ecu and have a look at what all the sensors are doing. let me know if your keen, i'm in Cannon Hill (south side).

Edited by QWK32
hrr31 Enthusiast

hrr31

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Posted

QWK32 that would be great if you could hook up the software and find out for me. what i mean by cutting out, it feels as though it just stops fuel getting to the motor the car will start to accelerate then its like some one has cut the throttle cable just cuts out before boost is even reached but doesn't stall and if i put the clutch in i can still rev it and release the clutch and i am able to limp it home providing i don't give it to much throttle? im located in Kenmore (west side) the car does not drive so i wont be able to come to you?

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