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Bus will not start
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blatzer
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PostPosted: Sun May 11, 2025 11:06 am    Post subject: Bus will not start Reply with quote

-2 liter, hydro valve, fuel injected- '78 campmobile
it has spark and fuel flow, and the valves and timing are within spec...
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busdaddy
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PostPosted: Sun May 11, 2025 11:14 am    Post subject: Re: Bus will not start Reply with quote

Did this come on suddenly?, done any maintenance recently?
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PostPosted: Sun May 11, 2025 12:07 pm    Post subject: Re: Bus will not start Reply with quote

If those things you mention are all perfect.... your plug wires are in the wrong spots in the distributor or the fuel is too old...
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blatzer
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PostPosted: Sun May 11, 2025 12:45 pm    Post subject: Re: Bus will not start Reply with quote

i was trying to install a pertronix, could not resolve the wire issue so i put the points back in and it's been silent since
itls getting spark, you can smell gasoline when cranking and not starting
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PostPosted: Sun May 11, 2025 2:13 pm    Post subject: Re: Bus will not start Reply with quote

blatzer wrote:
i was trying to install a pertronix, could not resolve the wire issue so i put the points back in and it's been silent since
itls getting spark, you can smell gasoline when cranking and not starting


Did you change the wire pattern when you put either distributor in? Normally one would rotate the engine to top dead center on the #1 compression stroke, and then make sure the rotor is pointing to number 1. The crankshaft has two top dead centers on each firing so make sure you are on the correct one. Is the distributor seated properly? If not it may not be keeping time.
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PostPosted: Sun May 11, 2025 7:01 pm    Post subject: Re: Bus will not start Reply with quote

is the ecu involved in this non-start event
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PostPosted: Sun May 11, 2025 8:42 pm    Post subject: Re: Bus will not start Reply with quote

blatzer wrote:
is the ecu involved in this non-start event


No. You can smell gas? Spark issue.

If you set your engine to TDC on the fan pulley, and have a helper/camera watch the valve adjusters on cylinder #3, rotate the engine a little back and forth around TDC, going a little more every few tries. If the rockers move, you’re at firing position for cylinder #1. If the rockers don’t move, you’re at firing position for #3.

Aftermarket electronic ignition: teaching us to adjust points since 1979.
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PostPosted: Sun May 11, 2025 10:10 pm    Post subject: Re: Bus will not start Reply with quote

fuel to air

Spark

Compression.

One of your jobs is to figure out which of the above is missing. Use your timing light to check for spark. Use your nose to tell you if there is fuel present or you can use some Berryman's B12 if you want to spray something flammable in it that won't lift a head, and you can turn it over by hand to feel for compression.
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PostPosted: Mon May 12, 2025 7:05 am    Post subject: Re: Bus will not start Reply with quote

hi, I assume the starter does turn around based on the info I read.
in that case...Maybe try to disconnect the CHT sensor wire and ground it, and try again.
Could be a CHT sensor gone bad.... but just a wild guess, but easy to check
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PostPosted: Mon May 12, 2025 7:39 am    Post subject: Re: Bus will not start Reply with quote

frankvw wrote:
hi, I assume the starter does turn around based on the info I read.
in that case...Maybe try to disconnect the CHT sensor wire and ground it, and try again.
Could be a CHT sensor gone bad.... but just a wild guess, but easy to check


To the OP. You would probably call this the Temperature Sensor ll , TS2, or similar in the states. (Bentley)
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PostPosted: Mon May 12, 2025 8:50 am    Post subject: Re: Bus will not start Reply with quote

Check for spark at the plugs and not just at the coil wire.
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PostPosted: Wed May 14, 2025 9:04 am    Post subject: Re: Bus will not start Reply with quote

the bus was running, now it's not- nothing was changed except the points...
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PostPosted: Wed May 14, 2025 10:16 am    Post subject: Re: Bus will not start Reply with quote

if you took the distributor out check

that it is fully seated

that the points are gapped right. I prefer to use a dwell meter because it will test them too

That the rotor is on and in the slot.

That the cap is on properly

That the wires are in the correct order with #1 being in the correct spot when the engine is on TDC of the #1 compression stroke

That the wires to the distributor are on the correct terminals

When all this is done check to see if you have spark at a spark plug, I use my timing light for that.

If you changed the coil when you added the electronic ignition, make sure you have the correct coil in it for point.
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PostPosted: Wed May 14, 2025 10:52 am    Post subject: Re: Bus will not start Reply with quote

Points need to open, the right amount, at the right time, with a good condenser.

Everything else is details.

Do the points fully open and close with engine rotation? How much is their max gap? .018" is great for new points, but a business card is 100% usable in a pinch. Any time you touch points, the timing needs checking, and almost always needs adjusting. Static timing anywhere between 10°btdc and TDC will get the engine started.

Gotta have the condenser connected to the negative coil terminal.

Robbie
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PostPosted: Sat May 24, 2025 11:45 am    Post subject: Re: Bus will not start Reply with quote

Quote:
if you took the distributor out check

that it is fully seated


bingo!
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PostPosted: Sat May 24, 2025 1:27 pm    Post subject: Re: Bus will not start Reply with quote

blatzer wrote:
the bus was running, now it's not- nothing was changed except the points...


Did you take the distributor out to change the points? If so did you remove the wires from the cap?

For reference, I always remove the distributor to when dealing with the points, and I always just set the distributor cap aside before removing the dizzy with the plug wire still attached. To do other wise gives you a lot more ways to mess something up. The VW boxer distributor is about as easy to pull and replace as any out there and is a skill every owner needs to learn. Without looking at it, I would suspect that John Muir's Idiot Book would be a good reference for dealing with the distributor as it assumes its readers are novices.
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PostPosted: Sat May 24, 2025 1:35 pm    Post subject: Re: Bus will not start Reply with quote

I think his post was that he fixed it by seating it better.

blatzer wrote:
Quote:
if you took the distributor out check

that it is fully seated


bingo!

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