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Old 05-19-2014, 03:25 PM   #1
WrenGB
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Question Mystery problem-won't re start when hot

Hi - My phaeton starts well from cold, I take it for a 6 mile drive and it runs fine. I switch it off and it will start again if I try it straight away but if left for about 10mins it will not re start. If it is then left for approx. 40 mins it will start fine! It has recently been to a specialist garage for a full service and had new radiator fitted, new points, new coil etc but still the problem persists. Any ideas please? Surely someone can solve it!
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Old 05-19-2014, 03:34 PM   #2
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Default Re: Mystery problem-won't re start when hot

Have you changed condensers yet? And Welcome to the club.

Mike
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Old 05-19-2014, 03:53 PM   #3
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Default Re: Mystery problem-won't re start when hot

Hey! have you tried any different start tactics , No choke, choke ,GAV off etc.? are you turning the gas off when parked?
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Old 05-19-2014, 03:57 PM   #4
Mitch//pa
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Default Re: Mystery problem-won't re start when hot

how about when it does not start do a proper diagnosis
ck for spark and fuel...
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Old 05-19-2014, 04:30 PM   #5
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Default Re: Mystery problem-won't re start when hot

Hook up a timing light to coil wire and hang it inside on dash where you can see it flash.

Go for a drive.

See if it flashes when trying hot start.

This will easily diagnosis or eliminate spark problem.
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Old 05-19-2014, 04:34 PM   #6
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Default Re: Mystery problem-won't re start when hot

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Originally Posted by bikejunk View Post
Hey! have you tried any different start tactics , No choke, choke ,GAV off etc.? are you turning the gas off when parked?
This is my thoughts also. It may get flooded with gas when turned off and you do not cut the gas off. My Ford 8N tractor does this.
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Old 05-19-2014, 04:37 PM   #7
WrenGB
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Default Re: Mystery problem-won't re start when hot

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Have you changed condensers yet? And Welcome to the club.

Mike
Thank you for the welcome message! Yes, the condenser has been changed.
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Old 05-19-2014, 04:51 PM   #8
WrenGB
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Default Re: Mystery problem-won't re start when hot

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This is my thoughts also. It may get flooded with gas when turned off and you do not cut the gas off. My Ford 8N tractor does this.
I do turn the gas off when I park. I have also tried many different combinations initially touching nothing, then pulling choke out then throttle no choke etc. The only answer seems to be to leave it for 40mins - not very good at a fuel station. Thanks for ideas!
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Old 05-19-2014, 05:33 PM   #9
William Kelchner
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Default Re: Mystery problem-won't re start when hot

A possible heat soak problem leading to vapor lock?
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Old 05-19-2014, 06:08 PM   #10
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Default Re: Mystery problem-won't re start when hot

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This is my thoughts also. It may get flooded with gas when turned off and you do not cut the gas off. My Ford 8N tractor does this.
Wow, My late Father rebuilt his 8N tractor engine when i was like 15, it ran better afterwards but would also still flood like yours.
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Old 05-19-2014, 06:48 PM   #11
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Default Re: Mystery problem-won't re start when hot

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A possible heat soak problem leading to vapor lock?
Good idea.
Try a tank of good gas instead of the ethanol laced crap gas, and also add 4 ounces of MMO per 10 gallons of gas.
That's what worked for me.
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Old 05-19-2014, 07:09 PM   #12
Ken B
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Default Re: Mystery problem-won't re start when hot

Is the gas cap venting properly? I had a similar experience and when I opened the gas cap I heard a rush of air. I put on a different cap and the problem was solved.
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Old 05-19-2014, 07:15 PM   #13
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Default Re: Mystery problem-won't re start when hot

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A possible heat soak problem leading to vapor lock?
I agree mine does some it when it is hot which is not often here in Vermont.
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Old 05-19-2014, 08:43 PM   #14
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Default Re: Mystery problem-won't re start when hot

I have always had to choke my sedan real quickly when it's hot. This over 50 years, two engine rebuilds, multiple carbs and distributors. I've just accepted it as one of those quirks. My other two A's don't require it.
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Old 05-19-2014, 11:19 PM   #15
Mike V. Florida
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Default Re: Mystery problem-won't re start when hot

I think it's the coil.

Touch the coil. Can you keep your hand on it?
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Old 05-20-2014, 01:17 AM   #16
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Default Re: Mystery problem-won't re start when hot

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Originally Posted by Ken B View Post
Is the gas cap venting properly? I had a similar experience and when I opened the gas cap I heard a rush of air. I put on a different cap and the problem was solved.
I have fitted a new gas cap but will check out what you are saying. Thanks for message.
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Old 05-20-2014, 01:24 AM   #17
WrenGB
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Default Re: Mystery problem-won't re start when hot

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Originally Posted by Mike V. Florida View Post
I think it's the coil.

Touch the coil. Can you keep your hand on it?
It did still have the original coil on it but after a series of repro's that leaked oil I fitted another new one at the week end. They all seem to get very hot but I have been told that is normal!?
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Old 05-20-2014, 01:35 AM   #18
WrenGB
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Default Re: Mystery problem-won't re start when hot

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Originally Posted by William Kelchner View Post
A possible heat soak problem leading to vapor lock?
The starter turns over really well but but it just won't fire up. When left for 30-40mins it starts up immediately. What would you suggest I check out? Thanks for your message.
Wren
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Old 05-20-2014, 01:44 AM   #19
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Default Re: Mystery problem-won't re start when hot

Take it one step at a time, check for spark will it jump a spark with a good snap sound that is nice and blue a 1/4"? If so, move on, is there gas dripping out of carb? Try shutting off the gas let the car run until it dies, turn the gas back on and try restarting, leave choke off, if it dous not start give it a quick choke, does it start?
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Old 05-20-2014, 08:55 AM   #20
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Default Re: Mystery problem-won't re start when hot

Modern coils are not meant to be mounted upside down, they will leak oil.

I had a 46 Dodge flat head 6 that did the same thing. I was told the starter was drawing too many AMPs when hot not leaving enough to fire the coil. Being a downdraft I would flood it, then have to take off the air cleaner and try and soak up as much gas as I could reaching down through the carb. That probly would give everything enough time to cool down and it would start.
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