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77 bay stopped running?
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cdolsen1
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PostPosted: Tue Jun 28, 2016 5:40 pm    Post subject: 77 bay stopped running? Reply with quote

I have a 77 bay. It has been sitting for 12 years. I replaced the starter, the fuel pump, fuel filter, fuel lines , battery battery cable. On the first test run she was running great for 20 minutes and about the first 3 miles. She then then sputtered and would barely run with the peddle to the floor. I was able to get her home with restarting her a few times. in the garage she will run until i try to give her gas. What should I start with? What would cuase this problem after warm up?
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busdaddy
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PostPosted: Tue Jun 28, 2016 5:42 pm    Post subject: Re: 77 bay stopped running? Reply with quote

Welcome, how's the fuel filter look now?
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cdolsen1
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PostPosted: Wed Jun 29, 2016 5:46 pm    Post subject: Re: 77 bay stopped running? Reply with quote

The same
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cdolsen1
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PostPosted: Wed Jun 29, 2016 6:02 pm    Post subject: Re: 77 bay stopped running? Reply with quote

I have found vacuum laeks and will start there.
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busdaddy
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PostPosted: Wed Jun 29, 2016 6:05 pm    Post subject: Re: 77 bay stopped running? Reply with quote

OK, so the tank wasn't full of crap?
Try unplugging the temp sensor #2, it's that single black wire coming from #3 head, if it suddenly runs (although rich) try replacing it.
Next step is a fuel pressure test and a look for vacuum leaks with a smoke tester.
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Tcash
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PostPosted: Wed Jun 29, 2016 6:09 pm    Post subject: Re: 77 bay stopped running? Reply with quote

Did you drain and clean the tank?
Tcash
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cdolsen1
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PostPosted: Thu Jun 30, 2016 4:06 pm    Post subject: Re: 77 bay stopped running? Reply with quote

I did drain the tank and it was clear. I had the bus idle for 20 minutes today and was fine until i hit the gas. I did disconnect the temp sensor and now it won't start.
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cdolsen1
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PostPosted: Thu Jun 30, 2016 4:07 pm    Post subject: Re: 77 bay stopped running? Reply with quote

I'm getting vacuum hos to replace and check for leaks.
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cdolsen1
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PostPosted: Thu Jun 30, 2016 6:58 pm    Post subject: Re: 77 bay stopped running? Reply with quote

Any idea where to get the heat sensor?
I cant find it on any site so far
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busdaddy
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PostPosted: Thu Jun 30, 2016 7:05 pm    Post subject: Re: 77 bay stopped running? Reply with quote

Yeah.........., that's a recent problem: http://www.thesamba.com/vw/forum/viewtopic.php?t=657159 , there's alternatives while we wait for a manufacturer to fill the void: http://www.thesamba.com/vw/forum/viewtopic.php?t=248511
Step 1 is test yours just in case: http://www.ratwell.com/technical/TempSensorII.html
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Wildthings
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PostPosted: Thu Jun 30, 2016 8:23 pm    Post subject: Re: 77 bay stopped running? Reply with quote

Sure the electrical plug is firmly fitting into the AFM?
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cdolsen1
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PostPosted: Sat Jul 02, 2016 2:59 pm    Post subject: Re: 77 bay stopped running? Reply with quote

I've replaced the vacuum hoses, fuel filter and drained and replaced the gas. Still won't start. It was running perfect three days ago. What could have failed to give this issue?
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busdaddy
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PostPosted: Sat Jul 02, 2016 3:14 pm    Post subject: Re: 77 bay stopped running? Reply with quote

Plastic block on the points broke and the gap closed up?, or maybe dirty contacts?
Connect a test light between the primary coil terminals and see if it lights when the key is on and blinks when cranking.
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timvw7476
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PostPosted: Sat Jul 02, 2016 3:17 pm    Post subject: Re: 77 bay stopped running? Reply with quote

There is an air flap in the intake, it's at the top of the rubber S boot intake.
If your bus back-fired, that door can jam shut, no air flow, no running.
Take the air cleaner off and check that flap opens & closes, you
should be able to do it with your finger, it has a dampening action to it
when it opens/closes.
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SGKent Premium Member
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PostPosted: Sat Jul 02, 2016 3:21 pm    Post subject: Re: 77 bay stopped running? Reply with quote

1) how much fuel did you put in the tank?

2) put a timing light on it and have someone crank it. Glance to see if the timing is still around 7 to 8 BTDC when it flashes if it flashes. If it does not flash look to an ignition problem.

3) Pour a TEASPOON of gas into the S-boot. Crank it, see if it starts. If it does then you have a fuel problem
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cdolsen1
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PostPosted: Sat Jul 02, 2016 4:45 pm    Post subject: Re: 77 bay stopped running? Reply with quote

There are no points. electronic ignition. The tank is half full. the air intake is open. It did back fire a few times but it kept running after. The timing is at 8.5.
Thank you for all the help.
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cdolsen1
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PostPosted: Sat Jul 02, 2016 4:51 pm    Post subject: Re: 77 bay stopped running? Reply with quote

injectors?
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busdaddy
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PostPosted: Sat Jul 02, 2016 4:53 pm    Post subject: Re: 77 bay stopped running? Reply with quote

busdaddy wrote:
Next step is a fuel pressure test .

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cdolsen1
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PostPosted: Tue Jul 05, 2016 3:23 pm    Post subject: Re: 77 bay stopped running? Reply with quote

When I replaced the gas in the system I did include a fuel system cleaner. After many attempts to start the bus is alive again!!!
I think maybe somE varnish in the hard lines may have caused the problem.
Thank you all for your help!
I'm sure I will have many other Questions along the way.
Great to Know I will have such AWESOME help!!
Thank you
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cdolsen1
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PostPosted: Sat Jul 16, 2016 12:32 pm    Post subject: Re: 77 bay stopped running? Reply with quote

Well the good news is that from a cold start, the bus will start and run at idle perfectly.
The bad news seems to be that during a test ride all is good for a couple of miles, then it will backfire if I try to put any strain on the engine. First any second gear seem OK but third or up a small incline and the fun begins.
After I get home and shut it off it won't restart until the next day.
Why does it seem to only happen when the engine is warmed up?
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