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r39o Samba Polizei
Joined: May 18, 2005 Posts: 9800 Location: San Diego
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Posted: Tue Apr 09, 2013 5:54 pm Post subject: Yet another no spark thread |
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85 automatic Digijet - bone stock - no spark
Typical ran when parked van.
Fresh fully charged battery, swapped in coils, ignition modules, dizzlies.
Not the relays, didn't think about that cause there was 12 volts going to the various places we expect. Ground referenced to chassis and engine to be sure. I probed the various connectors with boots pulled back. Normal.
I have read many no spark threads and my search shows 140 threads with no spark in them and a good dozen direct hits.
I have not made the crazy Mark test harness yet as I just saw that as I was reading in peace.
Again, nor the relays - got to find that box.......
So I will be making the test harness.......but what else do I want to consider? I have not been this stumped in years. My VW master tech friend with 30+ years of experience scratched his head too. So what did I miss???? _________________ "Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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funagon Samba Member
Joined: March 09, 2006 Posts: 1308 Location: SLC, UT
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Posted: Tue Apr 09, 2013 6:05 pm Post subject: Re: Yet another no spark thread |
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r39o wrote: |
Not the relays,
. . .
Again, nor the relays |
When I've been stumped by a no-spark vanagon, I eventually discovered that it was not the relays, but instead it was the wiring and /or pin connectors to the relays. Try wiggling the wires to the relays, squeezing the female end of the connectors tighter together, etc.
I know you already said it can't be the relays. But when I was in the same situation, it was the relays! _________________ 1990 GL 7-passenger
2.2 liter WBX |
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Ahwahnee Samba Member
Joined: June 05, 2010 Posts: 9776 Location: Mt Lemmon, AZ
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Posted: Tue Apr 09, 2013 6:08 pm Post subject: |
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Have you verified continuity/resistance of ignition wires, esp the coil wire? |
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crazyvwvanman Samba Member
Joined: January 28, 2008 Posts: 9895 Location: Orbiting San Diego
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Posted: Tue Apr 09, 2013 6:17 pm Post subject: |
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On the USA 1.9 Digijet system the relays have nothing to do with the spark. The coil and the ignition module get power from the key switch, via a black wire to coil. The ignition module sends power to the dizzy hall unit and the dizzy hall unit sends pulses back to the ignition module when distributor is turning. The ignition module fires the coil over the green wire.
The idle stabilizer unit is wired in between the ignition module and dizzy hall. You should bypass the idle stabilizer until things are working. It could even be the cause of no spark. Unplug the 2 connectors to the stabilizer and plug them into each other to bypass the stabilizer.
The 1.9 Digijet will fire the spark plugs with both relays removed and with the ECU removed.
(the 2.1 Digifant requires a ECU and ECU power relay in order to have spark)
Mark |
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r39o Samba Polizei
Joined: May 18, 2005 Posts: 9800 Location: San Diego
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Posted: Tue Apr 09, 2013 9:49 pm Post subject: |
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Ahwahnee wrote: |
Have you verified continuity/resistance of ignition wires, esp the coil wire? |
Just the coil wire and it is less than 1K ohm.
crazyvwvanman wrote: |
On the USA 1.9 Digijet system the relays have nothing to do with the spark. The coil and the ignition module get power from the key switch, via a black wire to coil. The ignition module sends power to the dizzy hall unit and the dizzy hall unit sends pulses back to the ignition module when distributor is turning. The ignition module fires the coil over the green wire. |
I think I verified most of this, but I never really saw pulses (volt meter flicker) and "may" hook up an O scope. But, I will re-verify to be sure.
crazyvwvanman wrote: |
The idle stabilizer unit is wired in between the ignition module and dizzy hall. You should bypass the idle stabilizer until things are working. It could even be the cause of no spark. Unplug the 2 connectors to the stabilizer and plug them into each other to bypass the stabilizer. |
First thing I did was to bypass that gizmo today. In the day there were some that were bad and you replaced them with another (green Triumph brand?) I dunno, but I put an updated one in years ago, but bypassed today to be sure.
crazyvwvanman wrote: |
The 1.9 Digijet will fire the spark plugs with both relays removed and with the ECU removed. |
So no need to find my big box of little black magic thingies.....
crazyvwvanman wrote: |
(the 2.1 Digifant requires a ECU and ECU power relay in order to have spark) |
I going to guess because the ECU controls the spark advance / timing but that is in the 1.9 dizzy mechanically.
Mark,
Will your dead van harness work in the Digijet van?
http://www.thesamba.com/vw/forum/viewtopic.php?t=349429
TIA,
Walt... _________________ "Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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crazyvwvanman Samba Member
Joined: January 28, 2008 Posts: 9895 Location: Orbiting San Diego
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Posted: Wed Apr 10, 2013 9:37 am Post subject: |
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AFAIK, the bypass tool will work with any year waterboxer. It is always important to be sure to plug the male spades only into pin 87 of the relay sockets, and to do it when the male spades have no power. Then when they are in the right pins connect power to the tool.
Mark |
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