R32 Gtr Idle Issues

[captain_jonno]

Hey guys got an issue with the GTR i just purchased.

The idle isn't always very smooth.. yesterday when driving back from essendon airport (visited friend) the engine would hesitate then if you wouldnt keep pepping at the accelerator it would stall at low speed.. so then i would roll to a stop and turn it back on, but then again if i didnt keep the revs up it would stall again..

so i would leave it off for a few minutes, then turn it back on.. and the revs would bounce all around from 100-1200 hunting around.. then eventually it would maintain around the 1000revs, but wouldn't really sound right.

then again for no reason it would be fine again.. this all happens once the engine is fully warmed up.

but when its not having the idle issues or like hesitating when driving at less than 60kph then it wanting to stall.. it feels great, boosts strongly and is basically awesome.

im currently staying at my sisters place in brunswick and am planning on driving back to adelaide on tuesday. So if anyone who is in the know wants to check it out let me know

Edited December 24, 2006 by captain_jonno

[Godzilla32]

Shoulda done a search on this issue as there have been many other posts on the same subject. Its prolly the idle control valve sticking/dirty or something along those lines...

[captain_jonno]

i can find the tutorial for the rb25det but not for the 26.. its all pretty random, like when its cold it seems fine..

[Godzilla32]

The Idle control valve is under the intake plenum (drivers side) it has 4 10mm bolts that hold it to the secondary air system and 1 hose that connects it to the bottom of the plenum. Remove all this then you can get it off and give it a clean. Good place to start anyhow.

Deren

[GTRgeoff]

Step one, check the throttle position sensor is at the right voltage - 0.5V (max is 4V).

Then muck with the IAC.

[Godzilla32]

Good idea forgot about that. Merry xmas mate

[justin911]

maybe the fuel pump is having issues ? can u hear it on in the background ?

[captain_jonno]

yeah i was thinking that too.. its definitely not consistant.. cant always hear it..

Edited December 25, 2006 by captain_jonno

[justin911]

my issue sounds kinda similar.. but it just happens at idle.. the pump seems to want to turn off after a few seconds and then she stalls

[GTRgeoff]

Yeah all the best Deren.

Most Skylines have a 2 speed setup on the fuel pump. Just bypass that by running direct fused power to the pump through a relay, using the regular pump power to operate the relay. See if that fixes the problem.

[SLIPPERY]

To me it sounds more like a problem with one of the AFM's. The solder joints inside the AFM's deteriorate with age and with jiggling around whilst driving they can lose contact. This would explain why sometimes the car drives and boosts as per normal and other times, once the contact is no more, you get crappy idling and stalling and basically no drivability.

Theres a tutorial on how to fix GTR AFM's. Sometimes the plugs can be a little dicky also. I just had to replace the top AFM plug with a second hand rb20 one and it works a treat. I even had the AFM repaired and it was the crappy $5 plug.

good luck

Edited December 25, 2006 by SLIPPERY

[captain_jonno]

thought i'd let you know that it was the bottom AFM. swapped it for a reconditioned one and presto! perfecto

[SLIPPERY]

i should quit now while im in front

[Godzilla32]

Good work. It can be a bitch to locate/diagnose these problems but when you fix it the satisfaction sure makes up for it! A scantool helps too LOL