Rb26 Idling Too High

[TwentySix]

hi have issue with bnr32 with rb26 idling at 1200. sometimes more. i know the throttle butterflys have been cleaned and suspect that being the cause ( suspect, correct me if im wrong -_- )

looking for the best way to fix it , i can pull the manifold off ( time is money ) and spray the butterflys with TOMEI butterfly sealer ( if its still avaliable )

this approach is desperate ....

f**k the police, thanks in advance

[DVS JEZ]

Spray brake cleaner all around where the inlet bolts to the butterflys an make sure there is no air leaks.

Check and adjust the iac valve.

Check the adjustment on the throttle butterflys.

Then if still no good remove throttles and get tomei sealer from just jap

[TwentySix]

thanks dvsjez, checked my throttle butterfly adjustments. and after alot of swearing ive adjusted them to max close. made a difference of 500 rpm ( down tone rev, not up tone which is good )

does the IAC system use a temperate sensor ( known to be an issue? ) car randomly idles high sometimes ... sits at 11,500 -1200 normal idle ( -_- ) and creeps to 1,400 or more sometimes

how do i test this ? Cheers

[Moodles2]

Usually cleaning the AAC helps, but with BNR32's it's in an absolute prick of a location. I know when I start mine it flys up to about 1300-1400 and slowly die down to ~1000-1100 after 30 seconds

[DVS JEZ]

The ecu uses engine temperature and controls the iac to suit.

Cold start should rev up to 1300ish and drop down slowly as moodles said.

Also as he said its an absolute prick to get to.

Have u tried brake cleaner to check for air leaks to the plenum

[XRATED]

IAC's usually gum up... Pull it off and clean him out.

Check you tb position sensor.

If no joy, try spraying carbie cleaner around all the gasket surfaces, stock gaskets blow out often.

If still no joy, whip off the mani (4 hrs) and re- adjust the tb's via linkages.. Use a molycote product (cant think of the exact product right now) around the edges of the tb's to seal. While you have the tb's off relace the side/shaft seals as these get old and dry- thus leak.

Good luck

J.

[Muff]

air leak could be from boosters as the one way valves die. and suck air in.

i blew tb shaft seals and idle went to 5000rpm. so i doubt its that.

check your pcv valve as mine also leaked. block the hose off and it will soon tell you. the plenum is a f**k to get off so, be prepared to get lots of beer into u.

if your in bris come round some time and we can rip it off, as i am pro at this now. lol.

look at charcoal can also as it has vacume lines attaached.

good luck

[DVS JEZ]

Whhhaaaaat. 5000RPM with an air leak. Are u certain?

[TwentySix]

thanks for comments

throttle butterfly are fine, tb rod adjustments are max closed and fine ( except one rod, the ball joint is alittle kinked but fine )

throttle position sensor was replaced awhile ago but should be good ... meant to be adjusted at close to 0.1 or 0.5 i forget and when rev goes to infinity apparently ... does any1 remember what its meant to be

doubt air leak but may aswell check to be safe

.......................................

car idles 1200 cold start .. after 20 or 30 minutes it creeps to 1300 sometimes 1400 if i drive it all day sometimes stays at 1400+ for a drive

think its temperature fault ? whats this AAC ? similar to IAC idle air control

[TwentySix]

like coolant temperate sensor ?

drove from bris to melb probably shat flames

[TwentySix]

like coolant temperate sensor ?

drove from bris to melb probably shat flames

[DVS JEZ]

Aac = auxilary air control.

Get a consult connected to test the sensors.

Set tps to .46V

Under the plenum there is the aac. Check i with a light. Using a phillips screw driver Wind the screw clockwuse to drop the idle down. Do this with the engine running

[SiR_RB]

Would nistune consult show tps voltage?

[Dose Pipe Sutututu]

I suspect AAC valve, the one that has a 12mm (or so) hose going to it. They usually die after sometime, try blocking or pinching that hose closed and see if the idle drops.

Not sure where it sits on a RB26DETT, but on RB20/25s they sit under the plenum and connect on the side of the crossover pipe.

[Muff]

each tb seal gives bout 2500 rpm so 2 = 5000....

still think its the pcv valve or another one way valve.

[DVS JEZ]

Would nistune consult show tps voltage?

Yep sure does. Also shows idle switch to make sure its activated

[AngryRB]

Hey i have the similar happening on mine but mines a rb25det

Mine idles on mostly 1200, somtimes 800 and other times 1000, its constant so not a huge problem.

when i had the standard computer it was fine, only when the power fc was installed so ive been assuming its just the computer that isnt perfect. Not sure if thats the problem in this case though.

[TwentySix]

i can hookup a car scanner that will read that info for free just need time to take it there

tps to .46v ok anyone know range of AAC and coolant temp sensor ? would be helpful