Date: Mon, 11 Oct 2004 08:32:19 -0400
Reply-To: dhaynes@OPTONLINE.NET
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: digijet FI adjustments
Content-type: text/plain; charset=us-ascii
If you have the Bentley and a good Digital volt-meter and a timing light you can do it. The Digijet requires very specific set up for the throttle plate, ignition timing, idle speed and CO. The adjustment on the AFM is only to help trim the adjustment at idle. Basic setting are as follows:
Engine close to operating temp.
With engine off, disconnect 02 sensor and bypass idle stabilizer.
Check throttle plate adjustment. Adjust stop screw so it does not stick closed. Idle air goes through bypass screw. Check operation of throttle switch or switches. Adjust as needed.
Start engine, adjust timing to proper mark at idle speed. Check vacuum advance operation. Opening throttle should quickly advance timing. Further check, remove vacuum retard hose, (one directly to manifold). Timing must advance. If not, hoses are wrong, diaphram is bad, or throttle plate not adjusted properly. Find cause. Adjust idle speed to ~950 rpm.
Using voltmeter, check O2 sensor voltage, (still disconnected). Should be about .5v. If no reading, rev engine for 30 seconds to heat sensor. Adjust AFM to get .5v. Just get it close. Slightly lean is better. Adjust idle speed again if needed.
Shut off engine, reconnect stabilizer and O2 sensor. Restart, and check O2 sensor operation. After 30 seconds or so, you should be able to see it working.
On occasion, you may have surging at idle, especially after a warm restart. If you do, I'll tell you how to correct that.
Dennis
----- Original Message -----
From: Darren Lastfogel <dlastfogel@PLYFORMS.COM>
Date: Monday, October 11, 2004 7:40 am
Subject: Re: digijet FI adjustments
> Ok I replaced the O2 Sensor, temp 2 sensor, checked fuel pressure
> 32 psi,
> adjusted RPMs to about 900 and checked all vacuum connections, now
> it runs
> fine after warm up(stalls when cold)Still runs rich, but better.
> Back to the
> CO adjustment screw Bentley just says adjust. Adjust to what? is
> it in for
> lean? or out for lean? or should I leave it to a mechanic? I was
> thinking of
> buying the JCW fuel ratio gauge to monitor.
>
> -----Original Message-----
> From: dhaynes@optonline.net [dhaynes@optonline.net]
> Sent: Friday, October 08, 2004 8:59 AM
> To: Darren Lastfogel
> Cc: vanagon@GERRY.VANAGON.COM
> Subject: Re: digijet FI adjustments
>
>
> This is not an adjustment problem, something is wrong. Most likely
> culpritis the temp 2 sensor or the connection to it. Check ground
> connections etc.
> Rich running after warm is probably bad O2 sensor.
>
> Dennis
>
> ----- Original Message -----
> From: Darren Lastfogel <dlastfogel@PLYFORMS.COM>
> Date: Friday, October 8, 2004 7:18 am
> Subject: digijet FI adjustments
>
> > Good morning Listees
> >
> > Last night I installed new exhaust gaskets because the PO never
> > put any on,
> > It always ran fine just sounded bad. Now it sounds quiet. This
> > morning I was
> > on the way to work and it was running very rich then after I turn
> > it off I
> > could not get the engine to start. My question is where do I
> > adjust the air
> > to fuel so the engine will lean out? and where is a good starting
> > point?
> > Darren
> >
>
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