R33 Turbo Idling

[azzafreddy]

i recently bought an r33, rb25det, its been sitting for 6-8 months doing nothing before i bought it and i still cant drive it yet as it is unregistered, on start up there is generally allot of smoke but after i drive it the smoke tends to dissapear (this could be because i live in the coldest part of australia). when im in 1st gear my car runs like gold but my main concern is what happens when im anywhere within 2nd and 4th gear, the car like gets to 3000-3500 revs then it will just idle (wont get any faster even tho i push the excelerator down further) if i excelerate really slow it works but whats the point of having a turbo charger car if thats the case... im not sure if the smoke could have something to do with this maybe there is water in the system? any ideas?

[(B1) MR_fanny]

auto?

[azzafreddy]

nope it's a manual, i think at some stage it was an auto tho because the gear stick center peice is an auto one and it has a short shifter, when i said 3000-3500 revs i actually meant 2000-2500 revs as well..mybad

[White GTS-T]

AFM. The ECU isn't getting an AFM signal, thus it will go into limp-home-mode and will not rev above 2500rpm.

[azzafreddy]

AFM. The ECU isn't getting an AFM signal, thus it will go into limp-home-mode and will not rev above 2500rpm.

oh really, well at least i know what the problem is, is it fixable and is it costy or cheap?

[White GTS-T]

All the symptoms your describe point to the air flow meter, except that fact that it runs fine in 1st gear, that is a little puzzling. Usually when the computer isn't getting the air flow meter signal, it will start and idle but the revs will hunt up and down and black smoke, un-burnt fuel, will pour out the exhaust. Because the computer doesn't know how much air it’s taking in, it goes into a default fuel map and absolutely pours the fuel in, and to be safe the engine won’t rev past 2500rpm.

Firstly make sure the air flow meter is plugged in. It's located in the intake piping that goes to the turbo, just after the air box or pod filter if you have one.

If it is plugged in, and your game, you could try to disassemble it. Sometimes there can be a dry solder on one of the pins. Failing that you could try to get your car on a 'scan tool' at your local mechanics or auto elec. But the best option would be to try and get yourself a second hand airflow meter, that is the same colour and from the same model engine as yours, off of these forums for around $50-$100 and see how that goes.

The air flow meter looks like this. http://www.rhdjapan.com/images/product/117...ormal/Image.jpg Hope that helps.