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dobryan Samba Member
Joined: March 24, 2006 Posts: 16473 Location: Brookeville, MD
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Posted: Tue Sep 21, 2021 8:07 am Post subject: Re: Very strange "no power" phenomenon with '89 2.1 (SOLVED) |
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djkeev wrote: |
It isn’t your running problem but on your distributor photos I don’t see a dust cap below the rotor.
If you look closely at the installed distributor cap without the dust cap installed there will Be play….. side to side rotational wiggle in the cap.
The alignment slot on the distributor body is milled Wider that the molded tang on the distributor cap.
It isn’t much but can affect your timing a fraction either way.
Dave |
Wiggle in the cap does not change timing. _________________ Dave O
'87 Westy w/ 2002 Subaru EJ25 and Peloquin TBD
"To travel hopefully is a better thing than to arrive." Robert Louis Stevenson
MD>Canada>AK>WA>OR>CA>AZ>UT>WY>SD
https://www.thesamba.com/vw/forum/viewtopic.php?t=620646
Building a bus for travel in Europe (euroBus)
https://www.thesamba.com/vw/forum/viewtopic.php?t=695371
The Western Syncro build
https://www.thesamba.com/vw/forum/viewtopic.php?t=746794 |
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floodwood Samba Member
Joined: October 22, 2017 Posts: 159 Location: Cambridge, MA
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Posted: Fri Oct 01, 2021 1:41 pm Post subject: Re: Very strange "no power" phenomenon with '89 2.1 (SOLVED) |
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New Coil and plug wires are in. While the symptoms have not returned, this was originally an intermittent issue so it remains to be seen if I am out of the woods.
NOID light (BOSCH2) is in the mail and I am looking for a timing gun locally as additional diagnostic tools. |
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32432 Location: Reading Pennsylvania
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Howesight Samba Member
Joined: July 02, 2008 Posts: 3260 Location: Vancouver, B.C.
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Posted: Fri Oct 01, 2021 2:08 pm Post subject: Re: Very strange "no power" phenomenon with '89 2.1 (SOLVED) |
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Hi Both Daves:
The rotor tip is wide enough to cover about 25 degrees of distributor rotation, which is equal to about 50 degrees of crankshaft rotation. This is intended by the factory to allow the full range of spark advance without having to rotate the rotor by a similar amount. The timing of the spark is affected only by the location of the Hall Sender windows and the ECU spark map. So long as the 50 degree overlap in the rotor-to-cap gap exists, the spark timing remains the same. _________________ '86 Syncro Westy SVX |
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DanHoug Samba Member
Joined: December 05, 2016 Posts: 4715 Location: Bemidji, MN
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Posted: Sat Oct 02, 2021 6:55 am Post subject: Re: Very strange "no power" phenomenon with '89 2.1 (SOLVED) |
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Howesight wrote: |
Hi Both Daves:
The rotor tip is wide enough to cover about 25 degrees of distributor rotation, which is equal to about 50 degrees of crankshaft rotation. This is intended by the factory to allow the full range of spark advance without having to rotate the rotor by a similar amount. The timing of the spark is affected only by the location of the Hall Sender windows and the ECU spark map. So long as the 50 degree overlap in the rotor-to-cap gap exists, the spark timing remains the same. |
this is entirely correct. and if the cap contact was way beyond the rotor contact with even greater degrees, it would only change the timing by the arc length X speed of electricity ionizing the air gap ... about 100,000 mph. a rilly rilly small amount.
timing is created by the fixed dist gear and the movable base position of the Hall sensor pickup around the window slots cut in the aluminum shutter wheel, which is firmly attached to the fixed gear below. the cap and rotor only serve to crudely point the spark at the correct cylinder after the body of dist/ECU says spark NOW! _________________ -dan
60% of what you find on the internet is wrong, including this post.
'87 Westy & '89 Westy both 2.1 4spd
Past projects can be found at--
www.thefixitworkshop.com |
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floodwood Samba Member
Joined: October 22, 2017 Posts: 159 Location: Cambridge, MA
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Posted: Tue Oct 19, 2021 7:28 pm Post subject: Re: Very strange "no power" phenomenon with '89 2.1 (SOLVED) |
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As an update to this thread, I have purchased a NOID light and all 4 of my injectors are working properly.
I am currently sourcing a timing light (willing to pay for shipping if anyone has a spare!!) and I am also using the aforementioned thread to build my hall sensor tester. I will advise once I have further updates on timing / hall sensor.
Although the poor running problem is still intermittently present, it is by no means a show stopper, though I’d like to get it solved before it ends up stranding me this winter. |
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