1978CJ5beast
New member
man o man where do I start......two month ago I got a 1978 CJ5, at some point alot of time and upgrades where put into it. A few weeks after i got it home, i noticed it took quite a bit to get started and i had to hold down the accelerator to maintain RPM before it would idle and not die, not to much longer i noticed a popping sound in the exahust and it would back fire.....since then here is the list of what i had done, normally one fix would lead to another issue. so i will just list what i have done and what issues i am having as of today.
All new 1406 Edelebock Carrb
HEI with new 8mm wires
all new spark plugs, all plugs cleaned and free trash
new valve covers and gaskets
new fuel lines, fuel pump and fuel filter
new hoses all around
new timing set
new gaskets from timing set, water pump, fuel pump
so prior to today and a crap load of timing tweaking the V8 304 was still back firing from the carb, shifted the Harmonic Balancer and there was alot of play, so i got a new timing set gears, and chain....
we did everything by the book, line up sprocket dots, counted the links, lined up the harmonic balancer to the TDC mark, took #1 spark plug out found compression stroke, rotated HEI, .........
so after the timing set change and double checking the #1 again for piston head, its still back firing from the carb, the one last check i have to do is rotate the HEI 180 just incase i was somehow on the exhaust stroke.....
minus the exhaust system popping and what not, this thing ran fairly well up until about two weeks ago. I have found out this thing had been hillbillied and jerry rigged so badly i just dont think its used to having good parts and being tuned properly lol IDK. It went from amazing fun, tearing it apart and putting it back together but now im just getting frustrated.......i have been reading post after post on this same topic and I think because of that i have checked almost everything prior to writing this, of course i could have checked everything otherwise it would have found the issue and would be writing this
HELP
All new 1406 Edelebock Carrb
HEI with new 8mm wires
all new spark plugs, all plugs cleaned and free trash
new valve covers and gaskets
new fuel lines, fuel pump and fuel filter
new hoses all around
new timing set
new gaskets from timing set, water pump, fuel pump
so prior to today and a crap load of timing tweaking the V8 304 was still back firing from the carb, shifted the Harmonic Balancer and there was alot of play, so i got a new timing set gears, and chain....
we did everything by the book, line up sprocket dots, counted the links, lined up the harmonic balancer to the TDC mark, took #1 spark plug out found compression stroke, rotated HEI, .........
so after the timing set change and double checking the #1 again for piston head, its still back firing from the carb, the one last check i have to do is rotate the HEI 180 just incase i was somehow on the exhaust stroke.....
minus the exhaust system popping and what not, this thing ran fairly well up until about two weeks ago. I have found out this thing had been hillbillied and jerry rigged so badly i just dont think its used to having good parts and being tuned properly lol IDK. It went from amazing fun, tearing it apart and putting it back together but now im just getting frustrated.......i have been reading post after post on this same topic and I think because of that i have checked almost everything prior to writing this, of course i could have checked everything otherwise it would have found the issue and would be writing this
HELP