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American Motors/Jeep 304 starts intermittently

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Expert: Kevin Pilotte - 11/5/2006


Question
I have a 77 304 in my jeep with 260,00 miles on the engine.  Engine ran great until August then started back-firing, stopping and not re-starting, etc.  I first inspected wiring, replaced distributor because wire going into it was frayed.  Still backfired and cut out.  

Put timing light on and saw that firing point was erratic.  Just replaced timing gear/chain set.  Engine started and after warming up, same problems returned.  When engine does start, ignition is preceded by loud backfire through the exhaust.

Replaced ignition module today, problem not solved.

Any ideas or help?  Plugs, wires, cap, rotor and fuel filter all replaced in July.

Wayne

Answer
Wayne,
Here's a few ideas for you:
1) Inspect cap and rotor for cracks or carbon tracks. I know they're new, but it can't hurt.
2) Perform a compression test. You could have a broken valve spring or a problem in your valve train.
3) Check the firing order and the plug wire routing.
1-8-4-3-6-5-7-2
4) is the carburetor OK?
Let me know your findings.
Kevin

American Motors

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Kevin Pilotte

Expertise

I can answer many technical questions relating to AMC vehicles prior to 1979. I also have experience with Rambler & Nash vehicles.

Experience

I am a former AMC technician, service writer and service manager. I have worked in AMC dealers in Illinois in the 70's. After college, I was a Field Service Rep for American Motors Sales Corporation, working out of the Chicago Zone office. I traveled to AMC dealers assisting in the diagnosis and repair of AMC vehicles. I was also the Area Training Manager for DeLorean Motor Company. I have 10+ years as an Automotive Instructor. I have modified and restored
numerous AMC vehicles. I have been working on AMC vehicles for over 30 years.

Organizations
I have been an ASE Certified Master Technician since 1975. This includes L1. I am also currently a Toyota Certified Master Diagnostic Technician.

Publications
I have articles in "American Motoring", the official publication of the American Motors Owners Association. They are the largest AMC club in the world.

Education/Credentials
I have a certificate I printed out from a website.

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