Shut off..then no start

adv rider · Posted: Wed Aug 06, 2014 8:05 pm Post subject: no start

Going thru Pro training manual: check for battery+ at terminal 15, with ignition coil on- if no voltage present . Repair wiring harness, well yeah... It would be nice to know where to look/and or test.

Has anyone dealt with this, and just added a power wire from somewhere else? How has it held up long term, and is there anything bad/unsafe about doing this? Thanks
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86' Wolfsburg weekender 2.1, 4spd, , merian brown

adv rider · Posted: Wed Aug 06, 2014 6:35 pm Post subject: no start

OK, feel like there's a chance for my trip. I made the crazyvwvanman test harness, van starts. Replaced ecu control relay-its runs, replace fuel pump relay-it runs. It won't run without power to the coil Crying or Very sad

. I am not sure where to go from here.
I do have a Bentley, but I could never get past basic electrical. Reading wiring diagrams confuses me. Does the coil #15? black wires, have power when key is on? Any ideas? And thank you to everyone that has helped-I never would have gotten this far on my own.
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86' Wolfsburg weekender 2.1, 4spd, , merian brown

crazyvwvanman · Posted: Wed Aug 06, 2014 2:49 pm Post subject:

No, that kind of problem is usually simple and cheap to fix if you are doing it yourself.

Mark

adv rider · Posted: Wed Aug 06, 2014 1:11 pm Post subject:

Merian · Posted: Wed Aug 06, 2014 11:17 am Post subject:

you say it cranks but won't start - does it crank slow?

what happens when it cools down?

crazyvwvanman · Posted: Wed Aug 06, 2014 9:07 am Post subject: Re: no start

Whenever the key is on there should be 12 volts at the black wires that plug into one side of the coil. Without that you won't get fuel or spark.

Mark

MarkWard · Posted: Wed Aug 06, 2014 9:06 am Post subject:

This is an excellent thread to help you.

http://www.thesamba.com/vw/forum/viewtopic.php?t=349429
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adv rider · Posted: Wed Aug 06, 2014 8:34 am Post subject: no start

Well I have no forward progress. Connections at starter do not move, when I pull on them . I have voltage in black box terminal, and at relays terminal 86.
I tried to check continuity between relay and coil, not sure if I was on correct
term. what is #15? is that the blk wires at coil? I don't seem to be getting the B+ voltage for 5 seconds. but not sure I tested correctly.

I have not checked for spark, since I know for sure that I have no fuel pump operation. Would having/or not having spark narrow down the diagnosis?
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86' Wolfsburg weekender 2.1, 4spd, , merian brown

adv rider · Posted: Wed Aug 06, 2014 7:23 am Post subject:

adv rider · Posted: Wed Aug 06, 2014 7:20 am Post subject:

[quote="crazyvwvanman"]It could well be a connection at the starter as that is a common cause of this set of symptoms. On the starter wiring stud the large battery cable and an engine compartment red power wire both need to be well connected. If the red power wire comes loose while you are driving the engine will keep running from alternator power but once you shut it off it won't start again. It will crank and crank but not start.

Thank you! I thought I had read that somewhere, but could not confirm it. I also plan on stopping by radio shack, and building the test harness you made.
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86' Wolfsburg weekender 2.1, 4spd, , merian brown

Dave Wood · Posted: Wed Aug 06, 2014 7:18 am Post subject:

I agree about the connections at the starter. This is a common place that gets a lot of crude and could use a good cleaning. Check and clean all connections there. I had an intermittent starting problem and it turned out to be a loose starter wire, one of the smaller wires from the ignition.
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Dave
87 Vanagon GL

crazyvwvanman · Posted: Wed Aug 06, 2014 4:53 am Post subject:

It could well be a connection at the starter as that is a common cause of this set of symptoms. On the starter wiring stud the large battery cable and an engine compartment red power wire both need to be well connected. If the red power wire comes loose while you are driving the engine will keep running from alternator power but once you shut it off it won't start again. It will crank and crank but not start.

Mark

adv rider · Posted: Tue Aug 05, 2014 11:03 pm Post subject: no start

It was running good too. I feel like the problem is right in front of me. I was trying to unplug, all the connectors in the engine compartment black box, but only 1 of them came apart.

Also the TDI starter is up against rad. hose, so I wonder about those old/hardened wires. I am going on a trip sunday-hopefully. So this has me stressed out..
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86' Wolfsburg weekender 2.1, 4spd, , merian brown

adv rider · Posted: Tue Aug 05, 2014 10:37 pm Post subject: Shut off..then no start

Ok, I've been searching trying to find some info. Driving this morning, shut off. Attempt restart-cranking but no start. Immediately I remove column cover, try new ignition switch. Still no start. I worked on it this weekend,so I retrace whatever I touched-nothing. Soo.. I get towed home. Try different fuel/control relays-nothing. Try a different ECM-nothing.

Now confused,I check for fuel pressure-none. I do not hear pump run,or relays click. But I am alone, so it is difficult trying to listen from drivers seat. I check ground at fuel pump-ok, I check power-none. I follow to engine comp. connector-no power. Are there any connectors in the black box? that I need to check? Also I put in a TDI starter recently, could anything from the starter connections be giving me issues? I did order a fuel pump ,before I found that I had no power Embarassed

.
Any advice, or links to more info appreciated
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86' Wolfsburg weekender 2.1, 4spd, , merian brown


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