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Date:         Tue, 12 Aug 2008 13:46:57 -0700
Reply-To:     Michael Diehr <md03@XOCHI.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Michael Diehr <md03@XOCHI.COM>
Subject:      Digijet Idle Problems
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

85 westy/1.9L/automatic -- the engine drives great -- I was running TDC timing, but moved it to 5 BTDC and it seems happy there while driving. I bypassed the DIS and set the idle to about 850rpm when warm as per bentley.

However, still having trouble getting my idle to settle down -- if I have the idle air bypass screw open enough so it doesn't die when cold, then when warm it tends to race (up to the 1500rpm fuel cutoff). If i have the bypass screw closed so that it doesn't do that, then sometimes it likes to stall out.

I'm 99% sure the throttle idle switch is working properly.

Oddly, this behavior seems worse at 5btdc than at 0. (I say oddly because it sounds like most other folks have a smoother idle with more advanced timing).

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.

My theory: One of my prior mechanics drilled the AFM's adjuster screw and may have changed that setting, back when I had vacuum leaks and dirty injectors and a questionable ECU. So, now the engine runs great, but idles poorly -- maybe the cause is this misadjustment?

I'm about to leave for a long trip -- any harm in playing with the AFM adjuster screw to see if the idle will smooth out?

According to a prior post re: the function of the mystery screw: > That screw is for adjusting the mixture at idle -- it regulates a > small bypass that allows air to go through the AFM without being > metered. You turn it while monitoring the CO level at the test port > ahead of the CAT. Once the throttle opens its effect is > swamped.


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