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#1 |
Registered User
Join Date: Jan 2009
Location: Sandersville, GA
Posts: 298
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Won't start when hot!
Ok, so the rebuilt 350 runs like a top, no overheating, no leaks. All is well till I shut it off after more than 7-8 miles of driving. It will not restart until it sits for 30 mins or so. The battery turns her over fine when she is cold, but can't manage to do so when the engine is hot. Swapped the battery out of Lil' Red and the same thing happened. We put double hump heads on the 350, so I'm wondering, do I need a new stronger battery or a high torque starter? BTW it will crank with a jump start even when it is hot. I had Advance Auto Parts check it and the print out showed a 25 amp drop on the battery and the alternator is fine at idle.
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How 'Bout them Dawgs! ![]() '10 Traverse LTZ 03 Silverado Z71 ext cab 99 Yamaha Grizzly 600 72 C10 350/350 sportside bed. 68 C30 flatbed. 350 4-speed. "I've got a good memory, it's just short!" |
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#2 |
Registered User
Join Date: Oct 2009
Location: Gardnerville Nv No Mo Cali!!
Posts: 869
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Re: Won't start when hot!
Same thing happened with mine a while back. It would crank very sluggishly. I thought the timing was just too far advanced but It was just a tired starter. I changed it out and it cranks like crazy now.
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#3 |
Registered User
Join Date: Aug 2002
Location: Muskogee, Oklahoma
Posts: 2,914
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Re: Won't start when hot!
Make sure all your connections are good, I had same problem but my hot wire from battery was hanging on by only a few strands. It looked ok but when I took starter loose the wire just broke in half.
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#4 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,481
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Re: Won't start when hot!
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I would say it is one of two things. Gas is boiling in the carb float bowl or the starter and solenoid are suffering from heat soak. When the starter and solenoid get hot it degrades performance. I had the starter problem so I decided to get one of the mini starters so it would have more air space around the starter. I had no more hard starting problems after that. Usually with the gas boiling in the float bowl problem it will show up after setting and idling for a period of time and the temp rises. When you accelerate after setting at idle for a while the engine will run fine for a minute or so then start running really crappy and will not accelerate. It acts like it is starving for fuel, which it is. You can usually cure this problem by installing a 3/4 or 1" phenolic spacer under the carb. Just a couple of things to think about. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#5 | |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: Won't start when hot!
Quote:
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A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#6 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,218
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Re: Won't start when hot!
If the engine spins over fine cold but grunts when fully warmed up it's most generally the starter heat soak problem. If the engine spins over normally when cold or fully warmed up but won't start up it's generally a fuel issue.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#7 | |
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Join Date: Aug 2011
Location: Atlanta, GA
Posts: 1,523
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Re: Won't start when hot!
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#8 |
Registered User
Join Date: Feb 2012
Location: Wenatchee, Washington
Posts: 92
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Re: Won't start when hot!
I had a 69 c20 that did that. It was a bad battery cable. It was the pos cable. It looked good but it was coroded inside the sheathing about 10" from where it bolts to the starter. I think maybe, the heat from the exhaust. Replaced it, no more problem.
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#9 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Won't start when hot!
in the edelbrock carb installation instructions they warn of this problem and suggest using a phenolic carb spacer
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#10 | |
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Join Date: Aug 2002
Location: Muskogee, Oklahoma
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Re: Won't start when hot!
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#11 |
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Join Date: Oct 2009
Location: Denton, Texas
Posts: 1,713
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Re: Won't start when hot!
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#12 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
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Well mine is fuel injected so I know it wasn't the boiling. After swapping to the Orileays super mini starter mine has never had trouble again.
Here is the thread on the starter. Over a year now and it's never gave me a bit of trouble even after driving hours. ![]() ![]() http://67-72chevytrucks.com/vboard/s....php?p=4151565
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#13 |
Registered User
Join Date: Jul 2010
Location: Hemet,Ca
Posts: 1,502
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Re: Won't start when hot!
My grandpa's 64 chevy truck does the same thing almost everytime he comes over here to my house. It happen again yesterday so it is on our driveway right now. How about the Distributor? do you think it could be the ignition rotor in there?maybe not tight enough or the lil chrome arm is not far/closed enough? No sure which one. He has a sbc350/th350. Grandpa made me laugh when he was walkin away from his truck. He said some choice words in spanish. I feel his pain. Put so much money in them and they want more attention haha.
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#14 | |
Registered User
Join Date: Apr 2012
Location: fowlerville mi
Posts: 6
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Re: Won't start when hot!
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#15 |
bbadfred
![]() Join Date: Mar 2008
Location: rantoul Il
Posts: 461
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Re: Won't start when hot!
No matter what you do find get a mini starter anyway! You will never regret it!!
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#16 |
Restoration Virgin!
Join Date: Jan 2008
Location: Huntersville, NC
Posts: 8,298
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Re: Won't start when hot!
check this thread for a mini starter that weighs just 7lbs and is $60...http://67-72chevytrucks.com/vboard/s...d.php?t=521843.....This will be the route I go next time I need tho change out the starter.....better than laying on my back trying to get that 20lb starter in place
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#17 | |
Registered User
Join Date: Sep 2009
Location: Visalia, CA
Posts: 247
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Re: Won't start when hot!
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#18 |
1962 C-10
Join Date: Apr 2005
Location: Las Vegas, New Mexico
Posts: 4,978
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Re: Won't start when hot!
The timing may just be a little too advanced. When I first saw your pic and saw the Edelbrock carb, I was going to blame it (heat soak) but after reading your post, I realized that's not your case.
Also, like the other's said, check your positive cable from the start... and make sure the terminals are clean and tight. Good luck... JC62 ![]()
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#19 |
Registered User
Join Date: Jan 2012
Location: quinton,nj
Posts: 28
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Re: Won't start when hot!
I had a 72 short bed that would not "crank over when hot"! You could jump the starter with a screwdriver and it would start, but not with the key!! After weeks of new parts ,battery,starter,ns switch, ground wires to the frame and fire wall ,I found that the wire that runs from the Positive batt terminal to the fender (black junction block) was shot!! I cut and soldered a new wire terminal on it and it was good as new!! You should also have one from the Negitive cable to the fender direct,with no junction block!!
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#20 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: Won't start when hot!
good thing its not a blower engine
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#21 |
Registered User
Join Date: Jan 2009
Location: Sandersville, GA
Posts: 298
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Re: Won't start when hot!
The timing thing could be it. We advanced it to the limit and then backed it down a hair. I didn't mention this earlier, but it does "diesel" for a few seconds when you shut it off. I usually just ease out on the clutch to stop it. I'm not gonna change too many things at once so I can tell what corrects the problem.
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How 'Bout them Dawgs! ![]() '10 Traverse LTZ 03 Silverado Z71 ext cab 99 Yamaha Grizzly 600 72 C10 350/350 sportside bed. 68 C30 flatbed. 350 4-speed. "I've got a good memory, it's just short!" |
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#22 | |
Senior Member
Join Date: Nov 2003
Location: Brookings, SD
Posts: 10,497
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Re: Won't start when hot!
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#23 |
Registered User
Join Date: Aug 2010
Location: Des Moines, IA
Posts: 1,241
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Re: Won't start when hot!
Nice looking engine bay. Is your lower radiator hose resting against your fuel line. If so that would really aid in the transfer of heat to your fuel and like LockDoc said it would boil while idleing. My truck would run fine once started as well but it would eventually just shut off with the factory cast iron intake and then I would have to let it sit and cool down to get it going again. I put a new aluminum intake on and put on a set of cross over block off intake gaskets on and it seems to be ok now.
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#24 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Won't start when hot!
You need a solenoid heat shield. (the one below is just a generic search, but the GM one looks just like it... it may be the correct one...)
http://shop.advanceautoparts.com/web...___#fragment-2
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#25 |
Registered User
Join Date: Jun 2015
Location: Longwood, FL
Posts: 165
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Re: Won't start when hot!
I have had similar symptoms with a fuel pump going bad.
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