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#1 |
Registered User
Join Date: Dec 1999
Location: Mid NE USA
Posts: 2,212
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Engine dies when weather is wet
My 68 Chevy
250 6cyl single barrel carb HEI ign (new wires, new cap and rotor) Stock air cleaner and filter is good, has heat tube down to manifold Manual choke manual trans On my way to work about 7 miles or so about 2/3rds way there the last couple of days it has been raining or heavy fog, when I come to stop or just in neutral coasting the engine is sputtering, idling low and it will die. Starts back up OK but if I want to continue running I have to give it gas or pull choke out a bit. I cleaned the Distributor cap with electrical parts cleaner and used carb cleaner around carb and manifold. No apparent vacunm leaks. Not sure what is causing this, any help would be great. Thanks Ron
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Member #111 68 C-10 ![]() 70 ![]() 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson |
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Engine dies when weather is wet
You’ve got a cold intake plenum!
Check that the heat riser is working? |
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#3 |
Registered User
Join Date: May 2011
Location: mich
Posts: 655
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Re: Engine dies when weather is wet
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#4 |
Registered User
Join Date: Dec 1999
Location: Mid NE USA
Posts: 2,212
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Re: Engine dies when weather is wet
The tube from air cleaner to the exhaust manifold?
Ron
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Member #111 68 C-10 ![]() 70 ![]() 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson |
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#5 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Engine dies when weather is wet
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#6 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Engine dies when weather is wet
Need a pic so we can see if the air cleaner, heat stove, stove pipe, and thermac are all present. If they are and the thermac is working (check to ensure it's not sucking air through the snorkel, should be pulling it up the bottom when cold), then check the heat riser valve to ensure it's still there and operating freely.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#7 |
Registered User
Join Date: Dec 1999
Location: Mid NE USA
Posts: 2,212
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Re: Engine dies when weather is wet
Here ya go. Thanks
Ron
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Member #111 68 C-10 ![]() 70 ![]() 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson |
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#8 |
Registered User
Join Date: Dec 1999
Location: Mid NE USA
Posts: 2,212
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Re: Engine dies when weather is wet
I have one like in pic but no heat coil, and it was stuck open( just like in pic) so I closed it Moved the weight to the bottom. may need to replace it
Thanks Borrowed pic from other post Ron
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Member #111 68 C-10 ![]() 70 ![]() 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson |
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#9 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Engine dies when weather is wet
Yup, I'd replace the heat riser valve to get it working. Did closing it improve the problem though?
You don't want to leave it closed permanently, I think you can burn exhaust valves that way. So a working one is a better choice! I'm surprised the way the snorkel is, with no valve! It just mixes some warm air in?
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#10 |
Registered User
Join Date: Dec 1999
Location: Mid NE USA
Posts: 2,212
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Re: Engine dies when weather is wet
No have not driven it yet. I will try to find a good one. Thanks Love you guys and this board
Ron
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Member #111 68 C-10 ![]() 70 ![]() 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson |
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#11 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,961
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Re: Engine dies when weather is wet
If this doesn't solve your problem, I'd check for a hairline crack in the distributor cap - or just replace it and see if it helps.
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