---------- Forwarded message ---------- Date: Tue, 8 Apr 1997 12:42:17 -0400 (EDT) >From: ERIC ZENO <emz@pgh.nauticom.net> To: Tom Young <young@sherlock.SIMS.Berkeley.EDU> Subject: Re: '86 idle revisited and other comments Man I think you found my problem!!!! My mixture screw doesn't do much backed out, just the same!!!! Please post this to the list!!! I'am sure that others would benefit! I would but I have been kicked off!
Thanks Eric Zeno <emz@nauticom.net> 86 VW-4x4 86 GL For Sale (Pgh. PA) 72 240Z 1936 Chrysler On Tue, 8 Apr 1997, Tom Young wrote: > > On Tue, 8 Apr 1997, ERIC ZENO wrote: > > Hummmmm..... return spring in the sensor.... Could you be more > > specific as to what this is, and what you did? > > In the "swing arm" type sensor (like L-Jetronic) the movement of the air > vane is resisted by a wound spring which looks like the spring in a old > clock. Over time this spring weakens, which results in the air vane > staying in a more "open" (i.e., rich) position than when it was new. In > my case, the spring was weak enough that even with the idle mixture screw > backed out fully, the mixture was still too rich. > > If you pop the plastic top to the air sensor you can see the spring. > It's below a toothed wheel to which it's attached. The wheel is kept > from spinning by a spring-steel lever arm which is lodged in one of the > teeth. The idea is to turn this toothed wheel in a clockwise direction, > which "winds" the spring, more effectively resisting the movement of the > air vane. > > If you try it, mark the position of the wheel so you can put things back > the way they were if you need to. Put the idle air mixture screw in the > middle of its range of adjustment. With the engine completely warmed up, > detach the O2 sensor and attach a volt meter to it. Then turn the wheel > (it helps to have a third hand) clockwise until you bring the voltage > from the O2 meter into the .5 volt range. > > > --------------------------------------------------------------------- > Tom Young young@sherlock.SIMS.Berkeley.EDU > Lafayette, CA 94549 '81 Vanagon > --------------------------------------------------------------------- > >
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