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American Motors/AMC 304 running rough and backfiring
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Question
My Jeep 304 just cut out on me one day. Replaced all ignition components and carb. I found a broken wire at the ignition module. Fixed that and now it starts but runs rough and backfires out of the passenger side exhaust. I put the #1 sparkplug up on compression and the rotor is pointing to #1 sparkplug wire. Also, the timing mark on balancer is pointing to TDC.
Now, when idling and puting a timing light on the balancer, the Jeep will run very rough on TDC and I have to turn the dist. way advance to where I can't even see the timing mark to get it to run somewhat desent. Still has mild backfiring out of passenger side exhaust and runs weak.
Timing chain jumped timing? Or is it valves in the passenger head?
Thanks!!!
Tommy
Some things that can cause backfiring is a broken valve spring or rocker arm bridge support; spark plug wires crossed; distributor cap; vacuum leak at intake manifold; or burnt valve(s).
I would pull the valve cover and check for a broken bridge support.
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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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