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'83 Vanagon Air-cooled cranks but does not fire up-
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rproskey
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PostPosted: Wed Aug 12, 2009 9:53 am    Post subject: '83 Vanagon Air-cooled cranks but does not fire up- Reply with quote

Hello-

I have read a lot of the archives about this problem but I still cannot get my van started.

I changed the fuel pump and filter. There is gas in the fuel rail. I have spark coming out of the spark plug wires. There is gas in the tank. My AFM switch is working properly. I cannot find the Cold Start Valve... anyone know where it is located or have a pic? the double relays appear to be working properly. I have voltage at the fuel pump when I turn the key on and when the engine cranks.

Please help!

Thanks-
Ray
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mightyart
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PostPosted: Wed Aug 12, 2009 9:56 am    Post subject: Reply with quote

http://www.thesamba.com/vw/forum/viewtopic.php?t=103698
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rproskey
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PostPosted: Wed Aug 12, 2009 10:42 am    Post subject: Reply with quote

Great reply! That answered a lot of my questions. I noticed that my Temp Sensor is broken off and not connected. Could this be the issue why mine won't start?

Thanks. I will be back!!!
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Randy in Maine
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PostPosted: Wed Aug 12, 2009 11:54 am    Post subject: Reply with quote

Yes it could. You need to resolve that issue first.
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rproskey
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PostPosted: Wed Aug 12, 2009 4:53 pm    Post subject: Reply with quote

OK. That was the problem with it not starting up! Now it starts but it quickly dies out (3-4 seconds). I need to change the spark plugs and wires, hopefully that will help.

Any idea what could keep it from running?

Thanks for the help so far!
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Randy in Maine
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PostPosted: Wed Aug 12, 2009 6:53 pm    Post subject: Reply with quote

Here is how it works.

When the key is in the "start" position, the fuel pump runs off the starter via the double realy. After the engine starts, the fuel pump is run off the little microswitch inside the AFM unit (via the little flap in there) nd the other sie of the double relay.

Start by cleaning and tightening the connections at the starter and the connections at the double relay. While youare doign that, aslo do the battery connections and the chassis ground strap.

Make sure the little flap inside the AFM is free to "swing".

Here is how the double relay works and how to test it.

http://itinerant-air-cooled.com/viewtopic.php?t=54...highlight=
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rproskey
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PostPosted: Wed Aug 12, 2009 7:01 pm    Post subject: Reply with quote

What makes the flap in the AFM "swing"? I know it is air flow, but is it air being sucked into the engine?

I need to do my ground straps also. The tranny/frame strap is in bad condition. Where is the strap from the engine to the frame?
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rproskey
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PostPosted: Thu Aug 13, 2009 9:14 am    Post subject: Reply with quote

Where is the ground strap located that connects the engine to the frame? Is it accesible from the engine bay or from below? I cannot seem to find one. I found the tranny/frame strap underneath... but no engine strap.

Thanks you!
Ray

Or, if possible, a picture of where it is! Thanks!
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rproskey
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PostPosted: Thu Aug 13, 2009 1:49 pm    Post subject: Reply with quote

OK. Here is the problem I found.

The engine will start but it will not stay running. I opened the AFM to watch the flapper move. From what I understand, the flapper must move (fluctuate) to keep the contact closed for the fuel pump to run. My flapper is not moving while the engine is trying to run. I can hold the throttle open and then the flapper will begin to move, but as soon as I let off, the flapper will stop moving and open the circuit to the fuel pump.

Question: Why won't the flapper in the AFM suck enough air to move without me manually moving the throttle?

Thanks people!!!

PS. The flapper moves freely.
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Randy in Maine
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PostPosted: Thu Aug 13, 2009 3:56 pm    Post subject: Reply with quote

Time to figure out if the double relay is working right (make sure it is well connected to the starter and also grounded first).

http://itinerant-air-cooled.com/viewtopic.php?t=54...highlight=
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rproskey
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PostPosted: Thu Aug 13, 2009 6:02 pm    Post subject: Reply with quote

The double relay is working. The flap in the AFM is not moving. I'm trying to figure out why no air is being pulled across the flap.

Thanks for the article on the relays Randy! That's going in my Vanagon binder!

OH! Where can I get vacuum hoses? A few of mine are shot and so are the 90degree boots.
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reluctantartist
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PostPosted: Thu Aug 13, 2009 8:31 pm    Post subject: Reply with quote

The usual places for the rubber stuff....Bus Depot, Go Westy, CIP1, Bus Boys...a few others I can;t recall off hand. You can get the hoses at your local flaps, but make sure you bring the old one with you. If your vacuum hoses are really bad that may be a big part of your current trouble.
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rproskey
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PostPosted: Fri Aug 14, 2009 9:30 am    Post subject: Reply with quote

By the way... what is a flaps store? Is it an acronym for something?
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shadetreemech
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PostPosted: Fri Aug 14, 2009 9:34 am    Post subject: Reply with quote

Friendly Local Auto Parts Store

Cool
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mightyart
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PostPosted: Fri Aug 14, 2009 9:34 am    Post subject: Reply with quote

rproskey wrote:
By the way... what is a flaps store? Is it an acronym for something?


http://www.thesamba.com/vw/archives/dic/f.php
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rproskey
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PostPosted: Fri Aug 14, 2009 1:08 pm    Post subject: Reply with quote

HAH! That is a good one! Friendly??? Kidding!
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