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Unread 04-03-2011, 02:35 PM   #1
ckritcoad
Registered User
1986 CJ7 
 
Join Date: Jul 2006
Location: Oregon
Posts: 101
Won't stay running when engine warms up.

77 Waggy
401 AMC
MSD Ignition Box
Mallory Unilite Dist. & Coil
Edelbrock carb (not sure cfm)
I bought the Jeep a year ago. It ran but pretty week for a long time. All of a sudden it stopped running after the engine warmed up. I realized the orignal owner had removed and bypassed the original ignition box. I put an MSD unit on it and it fired up no problem and ran like a horse. However, I still have the same issue...when it warms up it will die in the middle of driving it and it won't restart. Any ideas?

Thanks in advance.

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Unread 04-03-2011, 08:18 PM   #2
pleontks
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1976 J-Series Truck 
 
Join Date: Apr 2010
Location: Whetstone, Az
Posts: 1,130
Choke.
Mine's a 76 360 with the MSD, jeep elec dist, quadrajet

In an ideal world, I would run the vacuum choke, but I'm not smart enough to figure out all that extra stuff. I've tried the elec choke, not a fan. Now I just run manual chokes on everything. Pull it in to start, push it in when warmed up.
You can get a manual choke kit from kragen/checkers/shucks for around $10
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Unread 04-05-2011, 03:55 AM   #3
cheese_man
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1977 CJ7 
 
Join Date: Sep 2010
Location: arthur, ontario
Posts: 178
check the ignition coil ballast resistor
it could be corroded and heating up then stop passing electrical current through it

you can buy a mallory electronic part for that dist and remove the ballast resistor all together
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Unread 04-05-2011, 09:33 AM   #4
pleontks
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1976 J-Series Truck 
 
Join Date: Apr 2010
Location: Whetstone, Az
Posts: 1,130
with the MSD ignition box and coil, you should NOT be running a resistor. (either a resistance wire or a ballast resistor). You should have 12v at the coil.

When I had my prestolite ignition, she would run great, but wouldn't start if she was warm.
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Unread 04-05-2011, 10:46 AM   #5
davsfsj3xjs
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1987 FSJ Wagoneer 
 
Join Date: Dec 2010
Location: Denver, Colorado
Posts: 69
My '87 GW used to do that until I rebuilt the carburetor. I believe the the accelerator pump was at fault, I may be wrong, but it ran great afterwards.
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