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tunnvar
Samba Member
Joined: October 24, 2011
Posts: 261
Location: Austin, Texas
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 Posted: Sun Jun 26, 2016 5:28 pm Post subject: Overheating Help - Coil?? |
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It seems my 70 is overheating in the Texas summer heat when I am on an incline on the highway or of I have driven for several miles. I lose power in 4th and then 3rd before sputtering to a halt. I can still idle fine. The bus has been sitting for 12 months as I was out of the country.
Could it be a faulty coil? I had the engine mostly rebuilt over a year ago but the coil is still the same one from the old engine. Will a new coil deal with the Texas heat better. I did not have this issue this time last year driving up and down I35.
Cheers for any ideas.
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1970, Deluxe, 1600cc, Type 1 Dual Port
[url=http://www.vw-mplate.com/mplate2-35638.png]Click to view image[/URL] |
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Sun Jun 26, 2016 5:35 pm Post subject: Re: Overheating Help - Coil?? |
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is it new fuel or year old fuel?
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Tcash
Samba Member
Joined: July 20, 2011
Posts: 12844
Location: San Jose, California, USA
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50348
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| Posted: Sun Jun 26, 2016 5:54 pm Post subject: Re: Overheating Help - Coil?? |
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| A bottle of FI cleaner dumped into your gas tank could clean things up. |
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tunnvar
Samba Member
Joined: October 24, 2011
Posts: 261
Location: Austin, Texas
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| Posted: Sun Jun 26, 2016 6:05 pm Post subject: Re: Overheating Help - Coil?? |
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Great suggestions thanks. The fuel will likely be a mixture of old and new.
The carb is brand new, just put it in a few weeks ago. The points are good. New fuel filter went in last week.
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1970, Deluxe, 1600cc, Type 1 Dual Port
[url=http://www.vw-mplate.com/mplate2-35638.png]Click to view image[/URL] |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50348
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| Posted: Sun Jun 26, 2016 6:15 pm Post subject: Re: Overheating Help - Coil?? |
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| tunnvar wrote: |
The carb is brand new, just put it in a few weeks ago. |
That would make me suspicious. If your new carb is jetted too lean, the engine will run hot and weak. |
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12722
Location: on a bike ride somewhere
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| Posted: Sun Jun 26, 2016 11:09 pm Post subject: Re: Overheating Help - Coil?? |
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If the engine will go to 4,000 RPM in first or second gear, the coil is not to blame. The coil doesn't care what gear the car is in.
Robbie
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SGKent
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Mon Jun 27, 2016 7:05 am Post subject: Re: Overheating Help - Coil?? |
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Let's check the symptoms again. When it slows in 3rd and 4th, is it possible that the clutch is slipping and you just think the engine is failing you? Could the tank vent line be plugged? When were the valves last adjusted? Have you added a fuel drier to the tank incase their is moisture in it?
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12722
Location: on a bike ride somewhere
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| Posted: Mon Jun 27, 2016 7:10 am Post subject: Re: Overheating Help - Coil?? |
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Also, did the problem get worse over time, or did it happen suddenly?
Robbie
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Learn how your vintage VW works. And why it doesn't!
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Mon Jun 27, 2016 10:46 am Post subject: Re: Overheating Help - Coil?? |
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| tunnvar wrote: |
| ... Could it be a faulty coil? ... |
I stopped to help someone out of the snow and left my engine running. It died and sat for about twenty minutes with the ignition on. This damaged the coil. The symptoms were, it would start cold and run for hundreds of miles without a problem, but if shutdown would not restart while the coil was hot. After half an hour of cooling it would restart and run without problems for another hundreds of miles. A new coil solved this problem, but if I had known the exact "hot coil" problem I probably could have cooled it off with wet rags in a few minutes. If I recall it did not idle well with the "hot coil" and was likely to die unless I kept the RPM's up.
Aloha
tp |
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Harleyelf
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Joined: April 23, 2009
Posts: 1572
Location: Appleton, WI
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| Posted: Mon Jun 27, 2016 11:03 am Post subject: Re: Overheating Help - Coil?? |
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| I see the key information as being, "new carburetor just installed", which leads me to suspect a leaky manifold, causing too-lean running and overheating. |
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tunnvar
Samba Member
Joined: October 24, 2011
Posts: 261
Location: Austin, Texas
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| Posted: Mon Jun 27, 2016 11:43 am Post subject: Re: Overheating Help - Coil?? |
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Quality stuff. I will try all these things.
This problem has only just started in the last few weeks after the new carb was installed. Like I said the bus sat for a year. I did not have this issue before when it was my daily driver for months before I left it.
Valves have not been adjusted for a while even though it's been sitting for much of the last 12 months. New Carb symptoms could be key here it seems!
_________________
1970, Deluxe, 1600cc, Type 1 Dual Port
[url=http://www.vw-mplate.com/mplate2-35638.png]Click to view image[/URL] |
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SGKent
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Mon Jun 27, 2016 11:46 am Post subject: Re: Overheating Help - Coil?? |
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(1) if the old carb was working why did you replace it?
(2) did you keep a heated manifold or replace it too with a non-heated manifold?
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50348
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| Posted: Mon Jun 27, 2016 12:18 pm Post subject: Re: Overheating Help - Coil?? |
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| tunnvar wrote: |
Quality stuff. I will try all these things.
This problem has only just started in the last few weeks after the new carb was installed. Like I said the bus sat for a year. I did not have this issue before when it was my daily driver for months before I left it.
Valves have not been adjusted for a while even though it's been sitting for much of the last 12 months. New Carb symptoms could be key here it seems! |
I have found that because of our alcohol laced fuel, I have to richen the main jet(s) by one or two steps to get an engine to run well. |
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scrivyscriv
Samba Electrician
Joined: October 04, 2011
Posts: 2922
Location: Memphis
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| Posted: Mon Jun 27, 2016 6:10 pm Post subject: Re: Overheating Help - Coil?? |
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How do you know the engine is hot? Oil temp, CHT?
You might have sediment or trash in the main jet, low fuel pressure, clogged tank filter... Definitely doesn't sound much like ignition to me.
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Dünkelgrügen 1967 Java Green bug thread
Engine rebuild thread
If you're ever in the Memphis area, you are welcome to stop by for advice and help. |
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SGKent
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Mon Jun 27, 2016 6:37 pm Post subject: Re: Overheating Help - Coil?? |
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or carb icing if the manifold is a non-heated style
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