The procedure for setting the timing on a Digijet is to unplug the idle stabilizer and plug the wires together (bypass the stabilizer). Otherwise, the idle stabilizer (which alters the timing to achieve idle RPM) will fight what adjustments you make. Mike
Michael Diehr wrote: > hooked up my timing light and played with the AFM idle CO bypass > adjuster screw -- it was about 1/2 turn open from the fully screwed in > position. at the fully screwed in (fully closed? i'm guessing) the > idle was slightly smoother. > > I then played with the big throttle idle air bypass screw: I was > doing this with the idle stabilizer in circuit, and it was interesting > -- I could see the timing jumping around as the stabilizer functioned. > > Idle air screw too far closed: timing was advanced about 10-15 degrees > almost 100% of the time, engine RPMS sagging below 850 > Idle air screw a little too far open: timing went back to 5BTDC and > stayed there, RPMS 850 > Idle air screw way too far open: timing went back to 5BTDC and stayed > there, until the engine RPMs ran up to 1200 or so at which time the > timing advanced (presumably the distributor was advancing it). > > So, my new question is : is there a way to adjust the idle air bypass > by watching the timing? Presumably, if the air bypass is "just right" > one would expect to see the timing bouncing around a little bit, but > mainly staying at the stock setting...? > > > On Aug 12, 2008, at 2:49 PM, Jim Arnott wrote: > >> Change the idle stabilizer. Little green box with two round plugs on >> the >> bottom just in front of the coil on the l/h side of the engine >> compartment. >> That would be my *guess* >> >> Jim >> >> ----- Original Message ----- >> From: "Michael Diehr" <md03@XOCHI.COM> >> To: <vanagon@GERRY.VANAGON.COM> >> Sent: Tuesday, August 12, 2008 1:46 PM >> Subject: Digijet Idle Problems >> >> >>> The engine runs smooth and with good power, but idles like cr*p -- >>> seems like it's missing and has a slow-fast-slow-fast pattern, even >>> when it's holding steady near 850rpm. > |
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