At 02:00 PM 4/26/2001, Karl Wolz wrote: >Y'know David, it's not often that I get to correct you, so if I get the >opportunity, I'm gonna damn well jump on it. No, no, I'm going to wiggle out -- watch:
>The "auxiliary air regulator" does indeed sit on top of the 1.9 and just >below and to the left of the AFM. 'Course it does. But it's an aux air regulator, not an idle stabilizer valve. <g> > It's kind of an anvil shaped doohickey >that allows extra air into the engine on cold starts (the logic of which >escapes me as I thought you would want a richer mixture for a cold start). The ECU takes care of richening the mixture -- the air valve simply gives the effect of opening the throttle a little -- the air that goes through it has already passed through the AFM so it doesn't affect the mixture.
>The hunting is probably from a too lean mixture at idle, but you know that. Ah! No, I probably should have, but I didn't. My own experience of it has been from having the idle set high enough that the stabilizer could barely hold it down -- sometimes it would escape and then run into the cutoff at 1500 rpm, and bounce back and forth for awhile. On the other engine I work on (Universal Atomic Four) when the mix is too lean at idle it coughs and quits. >Most likely bypassing the idle stabilizer won't do much for him. It will get that little busybody out of the loop -- it contaminates everything else because it keeps messing with the timing. :) david David Beierl - Providence, RI http://pws.prserv.net/synergy/Vanagon/ '84 Westy "Dutiful Passage" '85 GL "Poor Relation" |
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