304 V8 runs well when cool, bogs down and skips when hot. - JeepForum.com
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Unread 08-15-2010, 03:32 PM   #1
SSnakeAce
Registered User
1977 CJ7 
 
Join Date: Aug 2010
Location: South Carolina
Posts: 1
304 V8 runs well when cool, bogs down and skips when hot.

Hi all,

At my wits end with this Jeep. It's a '77 CJ7 with a 304 V8 and a 3 speed, and a Holley 2bbl carb of some sort. Bought it from a guy in another state, and being entirely unfamiliar with Jeeps didn't realize just how many problems it has.

The biggest problem right now is that we cannot get it to run well. You can walk out in the morning, crank it, and it'll idle all day. You can even romp the throttle and it sounds just fine. As soon as you go to get out in the road, it starts to run noticeably worse, but still decent enough for a 33 year old Jeep. By the time you run around the block, it starts skipping and won't idle. Still cranks just fine, but the engine seems to be running hot as well (not that the aftermarket temperature gauge in it is installed correctly).

We're at our wits end with it. We've checked the ignition module, replaced the ignition coil, replaced the entire distributor (Ugh, Prestolite), fuel filter, plugs and wires, and today the fuel pump. Nothing seems to help.

The wiring in this thing is a bit of a hackjob, and looking at the wiring diagram I see the ignition coil is supposed to have an external resistor attached to it, which as near as I can tell this one does not. Could that be the problem? I know the coil gets -really- hot, but since it's mounted directly over the motor I expect it to get pretty hot anyway.

Any ideas to what to try next? I don't necessarily want to get it running perfectly, just enough to where I can get rid of it.

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Unread 08-15-2010, 04:06 PM   #2
brian613
Registered User
1977 CJ5 
 
Join Date: Apr 2009
Location: doolittle, missouri
Posts: 471
rebuild the carb. as far as running hot dose it have a fan shroud?
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