Throttle plate seal
So I picked up an Auto TB from a forum member and while it was in good shape and I shouldn't have messed with it - I did.
I took care to mess with the teflon coating on the walls of the TB, however, the plate does not quite seal (If you hold it up to a light there's some light pass through in the upper corner). Has anyone just removed the teflon altogether and been able to maintain a low idle? I'm convinced the high idle + teflon removal is more myth and fact. -Zach |
Teflon coating? Never heard of a TB with a Teflon coating. Most likely its just dirt and gunk on the interior. Clean it with some carb cleaner and a toothbrush and I bet it will seal again.
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the butterfly should never quite make a full seal.
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Originally Posted by neogenesis2004
(Post 573808)
Teflon coating? Never heard of a TB with a Teflon coating. Most likely its just dirt and gunk on the interior. Clean it with some carb cleaner and a toothbrush and I bet it will seal again.
-Zach |
never heard of this or seen anything that looks painted on...
http://www.boostedmiata.com/gallery2/d/70-3/auto_tb.jpg |
Originally Posted by Braineack
(Post 573820)
never heard of this or seen anything that looks painted on...
It's pretty common on Fords, BMWs, etc. It looks like carbon build up until you clean it at which point it becomes pretty obvious that there's some sort of coating applied - I swearz;). Keith from FM has posted on the GRM boards before. After spending 6 hours filing off all the unused bosses, smoothing flashlines and polishing the TB I'll be pretty pissed if I can't get this fucker to seal. -Zach |
Having worked with teflon (Xylan) coatings, and having 2 1.6L throttle bodies on hand I can safely say they don't come with any kind of coating.
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Originally Posted by Braineack
(Post 573826)
The mazda shop manual just mentions a 'plastic coating' but I assume it's a teflon based coating. I'm looking for the best way in which to remove the coating with using any agressive abrasives. So far, no luck. -Zach |
I don't see how that contributes at all to sealing. the bottom edge wouldn't even contact the bore.
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Every miata TB I've ever held to light has a halo around the butterfly...if it completely seals you wont idlez well.
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Originally Posted by Braineack
(Post 573842)
Every miata TB I've ever held to light has a halo around the butterfly...if it completely seals you wont idlez well.
I have a feeling I'm going to regret touching everything on this car at once ... too many variables. -Zach |
I still stick by my last point. I don't see how that "coating" on the back of the throttle plate has anything to do with sealing when the whole bottom half of the leading edge of the plate that does the sealing is the FRONT of the plate. Which btw, has no coating.
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Originally Posted by neogenesis2004
(Post 573877)
I still stick by my last point. I don't see how that "coating" on the back of the throttle plate has anything to do with sealing when the whole bottom half of the leading edge of the plate that does the sealing is the FRONT of the plate. Which btw, has no coating.
At this point I'm just going to remove the coating then dial in my throttle stop. Any Idle adjustment can then hopefully be done with the idle screw. -Zach -Zach |
Right, you should be able to trim up your idle with the screw. Also don't forget to adjust the throttle cable. Twice now when I fucked with the TB area my idle was running high afterwards and it was because the cable was pulling the throttle open.
BTW Brain, how is your chiseled up throttle doing? AOK? |
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