Rb30det Idle Issue

[aphid]

heya,

Just finished putting the rb30 together and i'm having a few issues.. the car turns over but hesitates massivly to fire, the only way to get it to run is to give it a bit of throttle, and even then it's sketchy, it's either give it throttle and watch it rev up, or back off and she dies.. feels really like a boost leak issue, except it will actually rev when given throttle, although been over it many times and can't find one nor hear one when it actually does turn over. when it does turn over it is running massivly rich (black smoke), so i was thinking that perhaps one of the cam gears has slipped when i was tightening it up and is now running an extra tooth retarded or something, i guess this will be the next thing i'll check but i'm stumped for idea's.. it's obviously getting both spark and fuel as it turns over.. any advice would be great

thanks alot guys,

mark

[Craved]

what ECU you running? injector sizing? etc etc

[FORZA-MOTORSPORT]

  aphid said:

heya,

Just finished putting the rb30 together and i'm having a few issues.. the car turns over but hesitates massivly to fire, the only way to get it to run is to give it a bit of throttle, and even then it's sketchy, it's either give it throttle and watch it rev up, or back off and she dies.. feels really like a boost leak issue, except it will actually rev when given throttle, although been over it many times and can't find one nor hear one when it actually does turn over. when it does turn over it is running massivly rich (black smoke), so i was thinking that perhaps one of the cam gears has slipped when i was tightening it up and is now running an extra tooth retarded or something, i guess this will be the next thing i'll check but i'm stumped for idea's.. it's obviously getting both spark and fuel as it turns over.. any advice would be great

thanks alot guys,

mark

Check that injector o-rings are in properly does it sound like there is a massive air leak??? Also what injectors are you running and what duty cycle did you set them too?

[Cubes]

It does sound a lot like a vacuum leak.

Have you checked the condition of the afm?

Did you replace injectors and use the incorrect injector collars? OR.. are the old injector collars leaking?

[FORZA-MOTORSPORT]

Get someone else to fire her up and stick your head under the bonnet and have a listen for a leak, please give all specs, injectors, afm, ecu etc

[aphid]

hey again,

really sure there's no boost leak, no hissing, been over it all including intake manifold.. as for specs, running a power fc (swapped back over to stock ecu but no luck) stock injectors, stock afm, stock turbo, fmic.. checked timing and it's all okay.. really starting to stump me :S

[webber]

try screwing up the idle adjuster screw a little... check AFM & TPS, vacuum leaks, and also if the car sat a bit make sure the fuel isn't stale, maybe throw in some injector cleaner... i had an RB30DET do the same thing. but after it ran for a bit it came good...

[aphid]

hrmz.. fuel is 3 months old at the most, would it go stale this quickly? sort of starting to feel like it might have a misfire once it get's revving.. i just get this feeling that the base timing must be out, but it all seems to check out

[aphid]

trying to brainstorm a few other idea's and i'm thinking that perhaps the AFM is dirty.. fair bit of oily smoke was flowing out through it when the last bottom end let go so i'll give it a whirl tomorrow

[Craved]

  aphid said:

trying to brainstorm a few other idea's and i'm thinking that perhaps the AFM is dirty.. fair bit of oily smoke was flowing out through it when the last bottom end let go so i'll give it a whirl tomorrow

perhaps in addition to this, check the DIY section for the repairing gtr AFM's thread, so you can check the dry solder joints within the AFM

[aphid]

will do, cheers for that

[Craved]

well here it is for ya

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

i got a little bored

[aphid]

afm checks out as okay, swapped it in with another one and still the same problem while fooling around wtih the afm's i though't i'd cracked it when the car held idle by itself indefinently hunting around (pretty badly i might add).. also noticed that if i can manage to hold the revs almost steady then the blow off valve is continiously sounding, even though the throttle is open..

[Craved]

if its leaking try blanking it off, swapping it out, or removing the vacuum line from it

[aphid]

well, got overly enthusiastic tonight and pulled the whole intake down from the plenum to the turbo, gave everything a good clean, went over it with a fine tooth comb, then cleaned all of the electrical plugs.. put it all back together and she's running.. still a bit rough but i've yet to properly setup the timing, so a win for the rb30det at last thanks for your help guys, much appreciated

[Craved]

thats good news, hopefully i dont have this problem when i finish assembling mine