Fuel Pump Or Afm Problem? R32 Gtr

[Scooby]

Guys;

couple of days ago noticed brief lumpyness at idle for a few seconds on 2-3 occasions when driving home. last night going up a slight hill, 50km/h felt minor hesitation very briefly, went a bit doughey rather than sharp cut out ie more like fuel than elec. going to work this morning stalled once while coming to a stop restarted no problem, same hesitation underway but for longer and more often. driving this arvo same thing but longer again and more often, stalled twice coming to a stop. checked AFM voltage with a scanner when underway and both were fluctuating as normal, saw nothing strange there even when it was chucking a wobbly.

i thought AFM but now i'm thinking fuel pump.

any ideas?

regards

[TurboX]

Check the fuel filter & AFM sensors not oiled up if you have oiled Air filter.

I pull the AFM out and spray with metho and light every few months.

The ECU is suposed to burn it off with current occasionaly but lighting it up with a gas lighter works as well.

Seems to clean it up OK.

[Scooby]

Thanks TurboX,

AFMs have been cleaned, filters (paper air filter) are only 5000km old.

[OohArrGTR]

Scooby , have you got stock BOVS?? let us know when you get the answer to it mines doing exactly the same

[mjfawke]

Check the fuel filter & AFM sensors not oiled up if you have oiled Air filter.

I pull the AFM out and spray with metho and light every few months.

The ECU is suposed to burn it off with current occasionaly but lighting it up with a gas lighter works as well.

Seems to clean it up OK.

The old Bosch hot-wire mass airflow meters heat the platinum sensor wire to ~ 1000C degrees on shutdown to clean them, but the Nissan sensor is a thin-film resistor air mass meter. They are not documented anywhere as being self cleaning.

[Scooby]

Chris they are stock BOV. Had another go with the scanner and this time did see one AFM playing up, also got error code AFM1. Not sure whch is number so replaced the one that looked worst. Disconnected battery overnight, still getting error code AFM1 but no stalling etc on the run in. Will change other AFM and see what if any codes come up.

[TurboX]

The old Bosch hot-wire mass airflow meters heat the platinum sensor wire to ~ 1000C degrees on shutdown to clean them, but the Nissan sensor is a thin-film resistor air mass meter.  They are not documented anywhere as being self cleaning.

Michael, I dont doubt your comments.

Its just that someone told me of this trick years ago and its always seemed to work for me, saving the cost of a new AFM.

I figured if its not working properly then what did I have to loose?

[mjfawke]

I figured if its not working properly then what did I have to loose?

Your airflow meter

But seriously, cleaning with brake cleaner etc. as documented on the forums seems to work quite well.