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1974 vw bug: starts fine..road..it wont restart until it cools down

 
6v_man_in_12v_world's Avatar
  • Answered by:6v_man_in_12v_world
  • Restoration Shop Owner
  • Positive Feedback: 100.0 %
  • Accepted Answers: 183
Verified Expert
in Classic Car

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SO, FAR SO GOOD WITH SHIMING THE STARTER.
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very helpful
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Walter was very helpfull. I'm confident that with his suggestions and step by...
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car still not working it is a fuel problem
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Understanding verbal communication can at times cause confusion. this man knew...
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Thanks for the info and sorry for the delay in paying you out.
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Thanks
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good help
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This is the second time Walter has helped me. As before, he did a fine job...

Customer Question

Hey Guy's-I've got a quick question,my 1974 vw bug, starts fine, run's good down the road but when i shut it off( after it's hot) it won't restart until it cool's down

 

Country: United States
Make: Volkswagen
Model: Beetle
Year: 1974

Already Tried:
Nothing

Submitted: 362 days and 19 hours ago.
Category: Classic Car
Value: $24
Status: CLOSED

Accepted Answer

Picture
Expert:  6v_man_in_12v_world replied 362 days and 19 hours ago.


6v_man_in_12v_world :

Hi Garth, my name is Walter. Let me see if I can help you with your problem tonight.

6v_man_in_12v_world :

You'll need to do some diagnosis work to pin down the problem for sure. Problems like this are not uncommon and sometimes the remedy is easy and other times it's a real chore to track down.

6v_man_in_12v_world :

The issue is most likely going to be either fuel or ignition. Keep a can of starting fluid with you and the next time it does it, give it a shot. If it hits and runs just long enough to burn off the starting fluid you sprayed, you have a fuel problem.

6v_man_in_12v_world :

If not, it's probably going to be ignition. Either get a spark tester or, before the next time it happens, figure out how you can position a wire to see the spark jump. You'll have to have a helper to do the cranking for this one. Just because you get a spark, that doesn't mean that's not your problem. Make sure it will jump a good distance (1/2 in.) with a nice blue arc. Under compression it takes a lot more voltage to jump the plug gap than out in the open, so if you're having to hold the wire real close to ground to get it to do anything, you probably have a weak coil.

6v_man_in_12v_world :

A weak coil will usually show itself when it's hot and then come back to life when it cools off. In my experience, this is probably the most common cause of trouble on hot starts.

6v_man_in_12v_world :

If you have anything else to add regarding your hot start problem, please let me know. I'm happy to help.

Customer :

Walter-Thank's I'll give it a try- also I did notice,when it wouldn't start, I had my wife turn it over and i could see the fuel in the fuel filter suck out and it seemed like it was not getting any fuel.But like I said after it cooled down it restarted, but ran a little ruff for about 30sec. then it smooth out

6v_man_in_12v_world :

Say Garth, how is the fuel filter mounted? I'm guessing it's an inline plastic (clear) type.

Customer :

Yes

6v_man_in_12v_world :

Is it where it can drain by gravity, above the carb? The reason I ask is because the carb won't suck a fuel filter dry on it's own.

Customer :

No it's below the carb. running into the fuel pump

6v_man_in_12v_world :

How long does it need to cool before starting again?

Customer :

About 15min.

6v_man_in_12v_world :

What you saw in the filter might have just been agitation. Fuel delivery stopping at shut-off just because it's hot would be a very odd problem. Try the tests I gave you, though. Do you know how old the coil is?

Customer :

No

6v_man_in_12v_world :

Well, give those two tests a shot so we can at least narrow down which system is causing the problem. If the coil looks old, just go ahead and replace it. Coils are often neglected just because a car runs, but you'd be amazed at what a difference a new one can make even without the problem you're having. When you learn more, write back. I'm happy to help until you get the problem sorted out entirely.

Customer :

Walter thanks alot,I'll replace the coil and give it a try.I never thought about coil..

6v_man_in_12v_world :

Thanks! Please let me know how it works out.

Expert TypeRestoration Shop Owner
Category: Classic Car
Pos. Feedback: 100.0 %
Accepts: 183
Answered: 4/8/2012

Experience: Full service restoration shop specializing in pre-war, brass era, and full classic, but also up to mid-'60s.

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