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Rb26 Throttle Bodies

rob82

By rob82,
in Engines & Forced Induction

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rob82 Mentor

rob82

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Has anybody had issues with RB26 throttles not sealing. I'm having problems reducing idle speed below around 1500rpm with the bypass screw wound right in and then timing being set to 10btdc cam timing factory setting - I know its not a tune issue. I have used all new std gaskets and know there is no vacuum leaks. I have pulled the throttle bodies off to find that they have been cleaned up. Now apparently there is a sealing film that they use from factory and it may have been rubbed off. Does anybody know how to seal them or are they now a throw-away item?

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https://www.sau.com.au/forums/topic/239148-rb26-throttle-bodies/
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rob82 Mentor

rob82

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did u ever think ur iac (idle air control) motor is gettin stuck on sum carbon and not sealing off enough to slow the idle?

I have checked that it works electrically but I didn't check if it was gummed up - 1000rpm from closed to full duty seems about right to me. You can physically see large clearances around the throttle plates.

femno Grand Master

femno

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Did you machine or linish or die grind with a pad any of the old gasket off?

If theres big gaps in the plates then u gotta fix that first. If the AAC is playing up just block the hose going to it, its sounds dodgy but works fine without the stepup, but I dont know about when you turn the a/c on. Could really drag the idle down. Thats if the a/c works...

But you can get it idling good without the sealant gunk. I cleaned mine clean as a whistle and have idle around 800 with AAC hose blocked because the AAC is shitted.

blind_elk Grand Master

blind_elk

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...I have pulled the throttle bodies off to find that they have been cleaned up. Now apparently there is a sealing film that they use from factory and it may have been rubbed off....
Yes, this will be the problem. I believe a bit of nail polish will do the trick.
rob82 Mentor

rob82

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Yes, this will be the problem. I believe a bit of nail polish will do the trick.

I've heard thats what some people do but I just thought there is a genuine fix - what is the film that they use from factory? Besides I wouldn't know which color to use :banana: !

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