Engine bog on 77 cj7 with 304 - Page 2 - JeepForum.com
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post #16 of 25 Old 03-22-2013, 04:27 PM
Noplainsdrifter
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1974 CJ5 
 
Join Date: Jul 2011
Location: Hillsboro
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I know with Holley 4 barrels that a good backfire can rupture the diaphram on the power vavle thus dumping fuel in the engine. But after reading your post a few times, it almost sounds to me that it's starving for fuel???? I would check float level again...


It's a Jeep Thing, Chrysler Doesn't Understand!
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post #17 of 25 Old 03-22-2013, 04:40 PM Thread Starter
neadb22
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1977 CJ7 
 
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When I came back from work I reset the holley to specs again and set the float to where I had just a little spilling over the sight hole when I revved the engine. I put in a new diaphragm last week and have test driven it four times since with no backfire. Oh and its a 2bbl with a 1/2" plate under it on the stock intake.
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post #18 of 25 Old 03-22-2013, 04:51 PM
Noplainsdrifter
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Have you always had this problem or is it a recent one? Try going back to what you changed recently???? Do you think it's flooding out? As someone suggested, pull a spark plug and see how it looks. Is the exhaust smell like gas?

Edit-After reading the OP, I'm wondering if it has to do with your distributor not advancing? Maybe be spark related.

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post #19 of 25 Old 03-22-2013, 05:06 PM Thread Starter
neadb22
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I have had this problem since the drive home from purchasing the jeep. The distributor is advancing, I hooked it up to full time vacuum to check for function and it accelerated the timing, hooked it back properly, had my step son throttle it and timing did accelerate.
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post #20 of 25 Old 03-22-2013, 05:08 PM Thread Starter
neadb22
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Oh and if you ride in it around the 1.6 mile block you come back breaking of gas. I've run an entire tank of gas out just idling and driving exactly 88 miles. I've maybe idled it for a half hour or so a day for two weeks. It reeks of gas all the time
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post #21 of 25 Old 03-22-2013, 06:05 PM
cj5huntingrig
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Sounds to me like a serious vacuum leak. Have you put a gauge on it at idle?

1974 CJ5 all stock except for Rocky Road SOA
Completely for hunting - not for show or rock climbing
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post #22 of 25 Old 03-22-2013, 06:14 PM Thread Starter
neadb22
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At idle my gauge reads 20 from the intake full time connection
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post #23 of 25 Old 03-22-2013, 06:18 PM
cj5huntingrig
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Wow. That's pretty good. Must be fuel delivery. (guessing)

1974 CJ5 all stock except for Rocky Road SOA
Completely for hunting - not for show or rock climbing
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post #24 of 25 Old 05-08-2013, 07:30 PM Thread Starter
neadb22
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I know its been a while but most people never put what fixed it.....
I changed the pickup line filter in the tank, added new fuel lines(the rubber sections), added a fuel pressure regulator and set it to 3.5 and a gauge to verify. Drove it for the first time today after all of that, and in about 40 miles it ran like a champ the whole time. I wasn't even able to get a full 2 miles in prior to that.
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post #25 of 25 Old 05-08-2013, 08:10 PM
RDH
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Glad you got it figured...

1978 CJ7: 304, 3Spd, AMC 20 Rear, Thrush Welded Mufflers W/ Turndowns, Unknown Front, Worn out Dana 20 case
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