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A Few Q's About Rb26dett Engine Idle Problem,

85URK

By 85URK,
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85URK Grand Master

85URK

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Hey guys, I have just bought an R33 GTR, trying to diagnose some problems.

can anybody help me with a few Q's i have.

Q1. Engine is idling high at 1500rpm? I have read broken TPS causes this, how do i check to see if its broken and where is it located? under the plenum area?

Q2. Does the RB26DETT have AAC valve? and where is it located?

Q3. Atessa 4wd reservoir in the boot, how do you bleed this system so you can put in fresh oil? and what oil should you use in this system? (I Have been told TRANS MAX Z) auto tranny fluid.

Q4. What colour are standard GTR injectors? yellow?

Sorry for all the questions, but im racking my brains trying to find any info on these questions. and having only recently bought an Rb26dett, i am not totally familiar with these engines compared to the RB25det.

Thanx in advance

Darren

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted (edited)
Hey guys, I have just bought an R33 GTR, trying to diagnose some problems.

can anybody help me with a few Q's i have.

Q1. Engine is idling high at 1500rpm? I have read broken TPS causes this, how do i check to see if its broken and where is it located? under the plenum area?

Q2. Does the RB26DETT have AAC valve? and where is it located?

Q3. Atessa 4wd reservoir in the boot, how do you bleed this system so you can put in fresh oil? and what oil should you use in this system? (I Have been told TRANS MAX Z) auto tranny fluid.

Q4. What colour are standard GTR injectors? yellow?

Sorry for all the questions, but im racking my brains trying to find any info on these questions. and having only recently bought an Rb26dett, i am not totally familiar with these engines compared to the RB25det.

Thanx in advance

Darren

TPS is located on the end of throttle linkage bar. Should be 0.4v at idle and 5V at full throttle...check with mulitmeter.

AAC valve is located under the plenum

Drain the fluid by removing the hydraulic line on the rear of the gearbox...replace the line...fill the reservoir back up...undo the white connector under the drivers kick panel...crack the bleed nipple on rear of box...turn ignition on...repeat. Yes transmax Z is what i use.

stockers are yellow

Edited by DiRTgarage
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85URK Grand Master

85URK

Posted
  • Author
Posted

ok guys, had the attessa system bled today, the little white connector seemed to be up under the dash more on my R33 gtr not in kick panel, maybe that was on r32 GTR. but we got it sorted in the end.

And the high idle problem seemed to be caused by the idle screw under the plenum was screwed up to 1500rpm for some reason. so we screwed it back to 1000rpm for idle , seems to work fine now. tps was working fine and so was the idle control valve.

GTRPSI Mentor

GTRPSI

Posted
Posted

Did it always idle high?

If it only just started happening out of the blue it could be your throttle body and intake gaskets have cracked, they are known to go brittle and leak air past them.

If you develop a miss fire off boost at say 1500rpm till boost, its a sure sign, my intake gasket had 3 places it was leaking from.

Also check hoses for cracks/leaks etc.

Hopefully it was just a little adjusting and not a leak somewhere....

85URK Grand Master

85URK

Posted
  • Author
Posted
Did it always idle high?

If it only just started happening out of the blue it could be your throttle body and intake gaskets have cracked, they are known to go brittle and leak air past them.

If you develop a miss fire off boost at say 1500rpm till boost, its a sure sign, my intake gasket had 3 places it was leaking from.

Also check hoses for cracks/leaks etc.

Hopefully it was just a little adjusting and not a leak somewhere....

No, when i picked the car up it was idleing at 1500rpm flat out, wouldnt go any lower, we adjusted it down and now it idles fine. i thought it was idle control valve or tps or something but it was just turned up.

  • 7 months later...
  • 1 month later...
85URK Grand Master

85URK

Posted
  • Author
Posted

well sorry i only just found this thread again. but my idle screw was wound out so the idel was higher, maybe done for some reason to mask another problem but im not sure. since winding it back in havent had any other problems with that area again. maybe check what everybody in this thread has said and just eliminate stuff as you go.

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