Problem stalling from running at speed,help

Help! My 74 bug that i drive about once a month has started having a new problem. It starts well & runs well at idle & at speed. The last time i drove the car a month ago i noticed a miss under fast acceleration in say 4th. At that time it seemed more like the clutch slipping. Today a foggy moist day I am feeling the miss again under hard acceleration in high rpm's in most every gear & a bogging as i slow down in gear. The new big problem is that the engine stalls once you prepare to stop. I am sure the problem is fuel or ignition related but i can't seem to get a handle on it. I just checked the points with a dwell & the timing. they are spot on. Any ideas? Bad points or condenser or coil? Bad gas or fuel pump? The car is tuned & in fine shape just not driven much. With between about an 1/8th to 1/4 tank of gas could water condense in the lines or tank cause this problem in a couple of months? Thanks guys!

Reply to
evanevans
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Missing under load on a moist day sounds like ignition. Any part of the system (coil/cap/rotor/ht leads/plugs) which is old/worn/cracked may break down under the hi voltage when moisture is present.

Breakdown of Hi tension parts is more apt to happen under load because the plugs actually require a higher voltage before they will fire.

The stalling may be a different problem. It's often related to over-rich mixture (minor flooding) when the engine is hot. Could be other causes and may not be easy to track down.

Speedy Jim

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Reply to
Speedy Jim

Thanks jim. I don't think running rich is the reason for the stalling as i can just turn the key to restart without any effort. Doe's this sound at all like a problem with the fuel pump leaking & starving the engine? If this sounds possible how can i test this?

Reply to
evanevans

if you were indeed starving for fuel, you would not be able to "reastart without any effort"

Reply to
Joey Tribiani

I'm open to any suggestion!

Reply to
evanevans

I am 99.99% sure i have found the problem. Thanks!

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Reply to
evanevans

Interesting read. I would still suspect the ignition 1st though ! Let us know how you get on with the heat risers.

On a side note, I have read that blocking your heat risers gives you a few more HP .

Rich

Reply to
tricky

"tricky" wrote

Must be a British myth. Never heard that here.

Reply to
isnot

The car was running strong like it had extra HP! I was realy having fun getting on the gas. Then my fun turned to frustration :(

Reply to
evanevans

An observation - very often when people get a properly rebuilt or new engine they experience power like they never would have believed, but it's because their previous engine was running so poorly. Just fixing an ACVW engine to specs will surprise many people.

(Ever wonder how many ACVW engines are running at possibly 50% of their capacity?)

Reply to
isnot

Found it !

Its in "How to hot rod Volkswagen Engines" By Bill Fisher

Reply to
tricky

I just returned from a drive & the problem is the same Checking the heat riser it is too hot to touch at the ends near the cylinders. Not as hot as the generator stand in the center. The intake manifold below the carb is not cold but just a moist clammy warm. How does this sound?

Reply to
evanevans

With respect, I don't understand for a moment how a stock ACVW can get another 4 or 5HP from blocking the heat risers. It's a passive system.

Reply to
isnot

I think it was more like 2 or 3.

Might have somthing to do with air density.

Cooler air is more dense - so more oxygen.

So as long as you avoid icing you get a boost.

Also in another book - V8's this time - moist air = more HP. Edelbrock do a water injection kit to add water to the inlet air/fuel mixture.

Its been a while since I read them though.

Reply to
tricky

I think that maybe Rich have some reasons to say that. I can speak for my experience. After rebuilt my engine I putted a blocked manifold and on the engine and it was running strong but with flat spot form the idle. I replace the manifold and looks like it isn't so strong but it can only be a feeling. When we have a flat spot we hit the accelerator to the end and then it goes. We never know for a second when it will go. That reaction can give false information's to your brain. Don't trust your feelings. If you are racing your best lap time sometimes is not the lap that we thought you were faster because you felt less G force. Most of the times the smooth lap is the one you were faster. My sons think that the beetle is a very fast car because of the noise. On a beetle at 140 K/hm we can get the same velocity feeling that on a BMW at 220 Km/h or more.

Jo=E3o

Reply to
joao_eliseu

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