Engine Cutting Out when driving - JeepForum.com

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post #1 of 31 Old 06-26-2013, 06:22 AM Thread Starter
Jefenhauser
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1980 CJ7 
 
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Engine Cutting Out when driving

I have an 80 CJ7 with a Ford 302 engine that has started to cut out when accelerating. The tach will goes to zero, the hiccups until I let off the gas then it goes back to normal until I need to accelerate again. I'm on my 3rd fuel pump which is a carter electric pump with a new filter before and after the pump. I check the MSD ignition control mod inside the distributor and it check ok. The MSD Distributor cap and rotor button are good too. The Engine Control module was replaced 8 months ago. I'm going nuts trying to figure out the problem here.

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post #2 of 31 Old 06-26-2013, 06:58 AM
jcal73
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Since the 302 has the distributor in the front you might want to check the wiring going to it.
Could be that when you press the peddle moving throttle linkage that something is contacting a wire.
Look under the hood and under the dash.

Hope that helps!
Jeff

Jeff

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post #3 of 31 Old 06-26-2013, 07:16 AM
cwsenn
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Check / replace the distributor pickup coil. Check the fuel lines for obstructions.
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post #4 of 31 Old 06-26-2013, 11:41 AM
LumpyGrits
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Ck for a broken 'feed' wire to the coil. Same for the dizzy.
LG
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post #5 of 31 Old 06-26-2013, 11:50 AM Thread Starter
Jefenhauser
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So with the tach freaking out when this happens y'all are thinking electrical issues ?
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post #6 of 31 Old 06-26-2013, 11:52 AM
LumpyGrits
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YUP!
Could be anydangthing from the ign. switch forward......
LG
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post #7 of 31 Old 07-09-2013, 11:40 AM Thread Starter
Jefenhauser
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Just an update I'm getting the engine rebuit as of now and found 1 piston had a broke ring. I know that wouldn't make it cut off but it doesn't help any . More to come.
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post #8 of 31 Old 07-21-2013, 07:51 AM Thread Starter
Jefenhauser
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Update we found the vacuum advance was not working and some bad connections at the electronic ignition in the distributor. I hope that was the problem.
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post #9 of 31 Old 07-21-2013, 04:52 PM
LumpyGrits
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That could explain the hole in the piston too........
LG
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post #10 of 31 Old 07-30-2013, 06:57 AM Thread Starter
Jefenhauser
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Ok back on the road! The cutting out was a loose wire at the distributor and the vacuum advance was shot. I've also had fuel delivery issues which looks like the the tank needs to be cleaned out. The power of converting from 2barrel to a four barrel carb is amazing! Back to loving my jeep!
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post #11 of 31 Old 07-30-2013, 10:53 AM
John Strenk
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Thanks for reporting back...

fast fix also.


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post #12 of 31 Old 07-30-2013, 11:05 AM
turbogus
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I'm glad you found the culprit I was also going to mention moisture in the dizzy, this was a common problem on my '69 Buick GS400



with a forward mounted distributor. In their wisdom, Buick placed the drains for the hood scoops right above the distributor. The trick was to squirt some WD40 into the cap.

The parts shop that stocks part for Skylab II will not have parts for our year/model of Jeep
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post #13 of 31 Old 07-30-2013, 03:11 PM Thread Starter
Jefenhauser
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Now since everything engine wise is doing good i'm back to having fuel pump problems. I'm using a Carter inline Solenoid style universal pump. It does good for a trip then it just quits pumping! I carry a spare bump you let the pump cool down and blow thru both sides and it starts pumping good again. The PO put the pump on the passenger side fender well and I'm thinking I should move it to the back of the jeep on the frame. Thoughts??
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post #14 of 31 Old 07-30-2013, 03:36 PM
LumpyGrits
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Closer to the tank the better for ele. f'pumps.
Need to keep air moving over the pump to cool it. That's why most FI f'pumps are in the gas tank.
LG
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post #15 of 31 Old 07-30-2013, 04:14 PM
JustinBooth52
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I had that same problem with my 06 rubicon and it turned out to be the wiring harness fell down and rubbed till it sorted! I would say you have a sort somewhere

2009 Red Rock JKU building it my way, one bolt at a time, with out instructions.
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