Fuel Pump Or Afm?

[Smackeyno1]

Hey,

Wondering if anybody has come across this bitch of a problem before?

Have an RB20 and when im moving pretty quickly the fuel starts cutting out on me.

I have replaced the fuel filter and that didnt make any difference - my theory is that it is either the fuel pump not activating or the Air Flow Meter.

Im gonna have to buy one or the other but want to get the best idea of what it may be b4 i splurge.

Any advice would be much appreciated.

Thanks,

Smackey

[mad082]

what are the symptoms? what do you mean by the fuel starts cutting out on you?

other possibilities are that the spark plugs are dead, or injectors are dirty.

[Smackeyno1]

Well its very random. You can drive for a couple of K's and there will be no jitters at all. Then all of a sudden the cars starts bucking like a rodeo bull because its not getting constant fuel supply. Then it will die. If i keep starting the car, it eventually settles and i can drive it again. That process repeats itself.

Whether theres a lack of fuel or air to the plenum, i dont know. Could be something completely different.

[SLIPPERY]

sounds like AFM. When you pass over bumps in the road it can wiggle the wires to the AFM just enough that the solder joins lose contact. With my car i can just touch one of the wires and the car stalls.

Also, when the car 'jitters' the air isnt being metred properly thus playing havoc with air/fuel ratios and no power/chugging.

you can fix it with a soldering iron and solder. take apart the AFM and re-solder the pins that connect the AFM to the wires. if youre confused, see the tutorial section

[Guest 40th-edition]

you can test your fuel pump with a fuel pressure guage and crimp off the return line for pump to reach max pressure output.

that will rule out the fuel pump.

hope it helps

[Smackeyno1]

Thank guys.

Had already clamped the return fuel line and it made no difference. I am now pretty certain its the AFM.

Have just purchased a Q45 upgrade. But ill still check out the DIY

[Smackeyno1]

BTW, I cant find tutorial for AFM maintence - could someone link pls.

Ta

[SLIPPERY]

Here you go you lazy sod it was on the 3rd page

http://www.skylinesaustralia.com/forums/in...howtopic=113284

[700HP-GTR33]

AFM.................

When I hit a slight ridge or bump the car feels like its just run out of petrol and only for a split second

then is ok.

I have a new petrol pump ,regulator and injectors.

I thought it was the ignitor not getting any earth,.

Now do a search and get the DIY AFM info like what i am just about to do.

[SLIPPERY]

hey im not stupid