Fast idle, In search of air leaks |
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Fast idle, In search of air leaks |
Rand |
Jan 25 2006, 05:54 PM
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#1
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Been trying to nail the fast idle problem for a while. Have absolutely ruled out any vacuum leaks above the throttle body. Have replaced the injector seals. That leaves me with.... Leaking around the butterfly in the throttle body? Or somewhere else in the plenum or intake runner seals?
If I put my palm over the air intake, it does choke it down. That makes me wonder if air is getting around the butterfly (since the idle air adjustment screw is all the way closed). But I'm a noob on this detail... Please comment on this!! I would think a crack in the plenum / air distribution box (whatever you wanna call the air box under the throttle body on a '75 2.0 Djet) would be rare. But I'm down to checking rare things on my list. I guess I don't mind taking all that apart because I haven't been there yet and wouldn't mind painting the plenum and air intake tubes anyway. Sooo.... Anyone have photos of disassembled plenum, intake runners, etc.? What will I need if I take this apart? (Seals/gaskets? Anything else?) |
SirAndy |
Jan 27 2006, 04:30 PM
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#2
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Resident German Group: Admin Posts: 41,679 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
PCV - route oil filler vent to the Plenum/TB
no PCV - route oil filler vent to the air-filter if you don't have a PCV and you hook that hose up to the TB/Plenum, you'll know as it'll make a loud and annoying sound as the motor sucks air straight out of the oil-cap ... if it stays quiet, you got a PCV. (IMG:http://www.914world.com/bbs2/html/emoticons/cool_shades.gif) Andy |
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