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?) |
Rand |
Jan 25 2006, 06:39 PM
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#2
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Robert... I think you mean the PCV valve?
Somebody please clear this up for me. My car does not appear to have one. From what I can tell, not all 914s had them. Which 914s used a PCV valve, and which ones just vent to the intake? Mine just vents to the intake. Which years/models/etc. use PCV valves? When does it matter if that vents to thin air vs. puke bottle vs. intake... ???? Running that to the intake... connects ahead of the butterfly... meaning backpressure at idle... Could that affect idle?? I wouldn't think blocking crankcase vent would slow idle... but I'm grasping at straws. Thanks Robert. |
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