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blues412002
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PostPosted: Wed Feb 14, 2018 6:11 am    Post subject: hard start and loss of power Reply with quote

I've read through many posts and just wanted some fresh input on my problem- back at first of January, I attempted to start my '74 Westy with a Raby camper special motor (4 years old). The air temp was abut 12 degrees (F). It had not been started since mid-October. Starting fluid was required to get her to light, but it was a real hard start, a lot of banging and such for a normally super smooth motor. Gave up.

Came back a month later, same thing although the air temp was now closer to 50 degrees. Started up, coughing and spitting. Got it warmed up, took it out on the road, coulsn't get over 50 mph, severe loss of power.

Dual Weber carbs, no choke. What could I have knocked loose or otherwise messed up with the extreme cold, hard start?
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Abscate Premium Member
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PostPosted: Wed Feb 14, 2018 7:14 am    Post subject: Re: hard start and loss of power Reply with quote

From sitting - most likely gummed up carbs from evaporated gas.
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Spike0180
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PostPosted: Wed Feb 14, 2018 7:26 am    Post subject: Re: hard start and loss of power Reply with quote

Abscate wrote:
From sitting - most likely gummed up carbs from evaporated gas.


X2. I run my bus at least weekly, usually twice a week. Carbs don't like to sit. Nor do these old engines, they just need to move.
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busdaddy
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PostPosted: Wed Feb 14, 2018 7:53 am    Post subject: Re: hard start and loss of power Reply with quote

Points?, or electronic ignition?
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SGKent Premium Member
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PostPosted: Wed Feb 14, 2018 9:31 am    Post subject: Re: hard start and loss of power Reply with quote

old fuel combined with low temps. Do these carbs have chokes? If so are they manual or automatic?
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blues412002
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PostPosted: Wed Feb 14, 2018 9:36 am    Post subject: Re: hard start and loss of power Reply with quote

Electronic ignition. No chokes on the carbs. I'll clean 'em out and see what happens...thanks!
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1956 Euro ragtop beetle (Ebon)
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2017 Tiguan (Sport II)
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blues412002
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PostPosted: Wed Feb 14, 2018 9:42 am    Post subject: Re: hard start and loss of power Reply with quote

So, will spaying the carbs with Gumout do the trick or am I now going to have to rebuild the carbs?

Also, before winter, I made sure the tank was full and had some gas conditioner in it. Thought that would do the trick, but maybe not.
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1956 Euro ragtop beetle (Ebon)
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2017 Tiguan (Sport II)
http://ralphspoilsportmotors.com
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SGKent Premium Member
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PostPosted: Wed Feb 14, 2018 10:01 am    Post subject: Re: hard start and loss of power Reply with quote

without chokes you won't find it easy to start in cold weather regardless what you do.

Chokes were added to make it possible to start a car in cold weather. That is true even when it is 40F or 50F outside. Get down to the teens and Id'd be surprised the car would even run until it is warmed up.
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*You can do it right the first time, or do it over, the choice is yours. It is a free country. As to brakes, steering, tires, axles etc. - you may only get one chance at doing it right.

* VW Buses and VW cars share many of the same systems but if you haven't owned a bus and maintained it for awhile, you really don't know how different it is.

Bus Engine Cooling Issues? https://kentcomputer.com/77VW/BusEngineCooling.pdf
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scubaseas Premium Member
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PostPosted: Wed Feb 14, 2018 10:11 am    Post subject: Re: hard start and loss of power Reply with quote

If you pull out a spark plug you will find it all covered in soot. If you start a motor in cold weather be ready to drive it a while to heat up and help blow the carbon off the plugs. If you move the Bus a few times in your driveway or start it and shut it down shortly there after it will eventually not start from the plugs being fouled with carbon. The spark will jump down the insulator, not across the tip as the carbon allows conduction of current. You will not be evaporating gas at a fast rate when it's 12*F outside. I doubt the carbs or fuel are the issue.

Without chokes you need to pump the gas a few times and it'll spit and pop until it warms up some.
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Wildthings
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PostPosted: Wed Feb 14, 2018 10:52 am    Post subject: Re: hard start and loss of power Reply with quote

If the engine will run I would try a quality Carb/FI cleaner dumped into the tank and see if that will clean things up.

Adding some upper cylinder wall lube like MMO, 2-cycle oil, or synthetic motor oil to you tank will help to keep the valves from hanging up in their guides.

If your engine was banging after you started it on ether, I would be worried that you may have damaged something. Crying or Very sad
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udidwht
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PostPosted: Mon Feb 19, 2018 2:08 pm    Post subject: Re: hard start and loss of power Reply with quote

Fairly typical behavior of Weber IDF's in cool/cold weather. Combine those carbs with a Raby cam and it's a bit more pronounced until you get some heat up the manifold/s. These are open air carbs and if left to sit for a length of time the fuel bowls will dry up.
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