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Date:         Fri, 28 May 2010 05:45:41 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: Digifant timing/tuning help needed
Comments: To: Greg Potts <greg@POTTSFAMILY.CA>
In-Reply-To:  <4BFF3549.4080503@pottsfamily.ca>
Content-Type: text/plain; charset="US-ASCII"

Sorry I missed the "Digifant" vs. "Digijet". The 2.1L Digifant does control the spark advance with the ECU. AFM and temp sensor are the primary spark advance signals. Since you are not seeing advance and you have the O2 sensor problem I suspect you have a ground problem. Possibly in the harness itself. The O2 sensor ground reference is also the ground wire in the distributor harness. The wire to the O2 sensor is a coaxial type wire, (inner wire outer shield). Pell back some insulation and check the outer shield for any stray voltage. With ignition on there needs to be no voltage between the shield and the chassis. If there is you have a problem. With the O2 sensor disconnected you should see about .5-.6 volt on that center O2 sensor wire. For the temp 2 sensor one wire goes to the ECU and the other goes to a ground. Another place for a bad ground connection.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Greg Potts Sent: Thursday, May 27, 2010 11:15 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: Digifant timing/tuning help needed

Hi Dennis,

I did say that it was a 1.9, but this particular engine is wearing the 1987 2.1L digifant cooling, FI and exhaust setup. There is no vacuum can on my distributor. The mechanical advance distributor is used with the 83-85 digijet setup.

Greg

On 5/27/2010 10:14 PM, Dennis Haynes wrote: > On the Digifant, the ECU has absolutely nothing to do with spark advance. > Problem is in the distributor. The distributor has mechanical (centrifugal), > advance, and vacuum advance and retard. > > Dennis > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > Greg Potts > Sent: Thursday, May 27, 2010 5:36 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Digifant timing/tuning help needed > > Hi Volks, > > My 1.9L digifant engine has been sluggish ever since I put it into the > bus back in September. It doesn't seem to make much power unless I wind > it out to 2.5K rpm or so. Fuel economy is nothing great either; I am > only getting 14MPG on a typical tank. > > Compression is good. (Around 150 on all 4 cylinders last time I checked) > Distributor is only 1 year old, as are wires, cap, rotor and plugs. If I > pull a plug wire off the distributor the idle staggers no matter which > plug wire I remove (ie, no weak link). > > Coolant temp sensor was replaced, it didn't help. O2 sensor is > disconnected until I get a new one; It's pretty much undriveable with > the O2 sensor connected. Throttle position sensor is working. > > So tonight I checked the timing. 5 degrees BTDC at 2K RPM with coolant > sensor disconnected. It's spot on at 2K rpm but as the revs increase the > timing stays rock steady at 5 degrees BTDC. > > According to http://www.oldvolkshome.com/ignition.htm the timing should > advance to 35 BTDC at 3K RPM.... > > I have tried swapping the ECU and AFM with good spare parts and it makes > no difference whatsoever. > > Am I doing something wrong, is the ECU broken or am I reading more into > the oldvolkshome specs than I should?


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