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Irwin Arnstein working on his
1959 Chevy 1-Ton


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Joined: Aug 2018
Posts: 14
T
TEBO Offline OP
'Bolter
I have been trying to solve this on my own for a while with no luck so I'm coming to the experts. My 1949 truck has a 1953 engine that I converted to Protronic's electronic points. Everything else is pretty much stock except I believe the distributor cap and rotor are for a 216 engine not the 235 that is in it. The problem occurs after driving about 15 miles on the expressway. I suddenly lose spark and the engine backfires and dies. After letting the truck sit for 5 or 10 minutes it starts up and goes and will fail again after 10 miles or so. I replaced the coil with a new Protonic coil, the spark plug wires with Protronic wires, and put a new Ignitor II (Mfr. #: 91168LS) in. Did not fix the problem. I have the ballast resistor bypassed. One of the first times it happened I coasted into a gas station and we tried using Ether to get it started and it did not work that is why I believe is spark, not fuel. Any ideas?

Thanks,
Terence


TEBO
1949 Chevy 3100
Joined: Jan 2019
Posts: 352
F
'Bolter
What kind of condenser are you running? Take a look at the stickys about upgraded condensors, that sounds like a classic case of heat soak.

Edit: https://www.stovebolt.com/ubbthread...native-condenser-update.html#Post1388813

Last edited by Fibonachu; Mon Mar 14 2022 04:14 AM.

58 Apache, long bed fleetside, V8 w/SM420
Drivable but the rear axle needs work.
Joined: Feb 2004
Posts: 24,732
H
Kettle Custodian (pot stirrer)
"Protronic's"? If that's anything like "Pertronix" you just answered your own question. "A spare point type distributor - - - - -don't leave home without it!"
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
Ernest Hemingway

WAG MORE- - - - - -BARK LESS!
Joined: Aug 2018
Posts: 14
T
TEBO Offline OP
'Bolter
Dang spell check PerTronix 91181LS - PerTronix Ignitor II

Terence


TEBO
1949 Chevy 3100
Joined: Apr 2002
Posts: 2,087
F
Fox Offline
A teacher, but always an apprentice.
http://www.langdonsstovebolt.com/store/#!/Stovebolt-Mini-HEI-for-GM-216-235-261-&-GMC/p/1222040/category=18665949

Get this. I have one on my ‘62 261 in my 51 GMC one ton. Runs great. You won’t regret it.


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1951 GMC 9430 1 ton dually—-Shiny!

1970 Chevrolet C10 - Grandpa’s- My first truck.—in progress to shiny
1972 Chevrolet C20- Rusty- the puzzle box lid for the C10.
1950 Chevrolet 1300- in progress to shiny.
1962 AMC Rambler American- my wife’s

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1951 GMC 9300
1951-GMC 9430
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Joined: Mar 2010
Posts: 1,371
B
Curmudgeon
PERTRONIX 91181LS IGNITOR II DELCO 8 CYL LOBE SENSOR????

A quick check for Chevy 6 cylinder (please verify yourself):

PerTronix 1168LS 12 volts
PerTronix 1168LSP6 6 volts

You don't need to use a Pertronix coil. Original is more than adequate.

Ditto on langdonsstovebolt Mini-HEI-for-GM-216-235-261
BUT.....Heaven forbid anyone finds out or notices.....FORD parts.

Last edited by buoymaker; Mon Mar 14 2022 06:35 AM.

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
Joined: May 2005
Posts: 8,874
B
Sir Searchalot
This could be as simple as gas cap not venting.

Last edited by bartamos; Mon Mar 14 2022 05:55 PM.

Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
"We have no time for comment, every man will make his own. LET IT BE MADE WITH POWDER AND BALL!!!"
I recommend invoking MIL-T-FP41c when machining and fabricating
I used to think beer was bad for me, so I gave up thinking.
Sometimes no nonsense makes sense, in a sense.
You can't teach a new dog old tricks.
Honk if you're Amish


Joined: Apr 2005
Posts: 10,951
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
My opinion of Pertronix ignition systems is well noted on the site so I won’t go into that. As Bartamos mentioned in his last sentence, loosen the gas cap and go for a drive. If it doesn’t die you found your problem. If I’d does croak, pull off all the Engine items with the word Pertronix on it and put the stock stuff back in. If it dies after this come back for specific tests to get you going. Good luck.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
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Joined: Dec 2017
Posts: 1,142
D
'Bolter
Lets deal with a little low hanging fruit, the distributor. Take the cap off and get the delco number from the breaker plate. Lets see what you have there to begin with. The Delco number will dictate which style cap and rotor you should be using.

Last edited by Dragsix; Mon Mar 14 2022 01:56 PM.

Mike
Joined: May 2005
Posts: 8,874
B
Sir Searchalot
NEWS FLASH...............He posted the exact same questions ONE YEAR AGO. Got some help and like now, never followed up. So I'm no longer interested. Not a good responder.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
"We have no time for comment, every man will make his own. LET IT BE MADE WITH POWDER AND BALL!!!"
I recommend invoking MIL-T-FP41c when machining and fabricating
I used to think beer was bad for me, so I gave up thinking.
Sometimes no nonsense makes sense, in a sense.
You can't teach a new dog old tricks.
Honk if you're Amish


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