Rb25det Strange Hesitation On Take Off

[genkin]

My RB25DET Auto Stagea has been acting really weird on take off.

When taking off from a complete stop, 50% of the time the car will hesitate for 5-10 seconds and crawl along at a terribly slow pace. Then all of a sudden it will hit about 2500rpm and boost away like normal.

If I put my foot flat it will do the same thing but even worse, will also occasionally make a 'popping' noise from the rear of the car (missfire)

I have already changed the coilpacks, cleaned and gapped the spark plugs, and cleaned the AFM. I also believe the fuel filter was changed less than 5000km ago.

Any ideas? Any help would be appreciated.

HELP!!!???

[genkin]

Any ideas? anyone?

[H@ME]

maybe try new AFM off someone else's rb25? ahh it hard to say, but sounds like you've taken all the correct steps so far

[UCD15R33]

clean the throttle boddy maybe or air flow meter.

[madbung]

Throw some injector cleaner through it, use the nissan stuff.

Failing that remove and inspect injectors.

[genkin]

Oh, i've also used some injector cleaner through the fuel (Wynns or something like that)

It doesn't seem to do it when the fuel tank is below 1/4 !!??

[Craved]

get a fuel pressure guage on there- most mech's have them they tape to the window of the car so they can test the pressure when driving

[Krishy]

my rb25 used to do that and seemed like it was something to do with the AFM but all it needed was to be driven like a granny for about 1000kms.....the problem i used to have was when the motor warmed up a bit it would start jerking while cruising and didnt want to be driven at all....but after driving like a granny for the next 1000kms the ecu relearnt itself and it has been good since then even after been thrashed for an 1hr or so straight no probs...

[r32sky_line]

Could try disconecting the battery to reset the ecu.

[lighty01]

Could try disconecting the battery to reset the ecu.

x2!

same thing happens on my old mans falcon..

after the reset it works normal.

[genkin]

Oh yeah, I've also tried disconnecting the battery and draining the current so the ECU resets.

Can someone describe the proper procedure for this?

I disconnected the battery then held the brake pedal down for 30seconds or so.