258 engine making popping exhaust sound

stockcar

Well-Known Member
Joined
Mar 21, 2005
Location
Chapel Hill , N.C.
I have a 1983 CJ7 with a stock 258 engine . When I let off the gas coming to a stop , there is a pop pop popping sound from the exhaust , kinda backfiring but not a big bang like a gun shot . If I push in the clutch and rev up the engine as I stop the popping sound go away . Any ideas as to what my problem might be ? thanks in advance
 
I had a similar condition. I found two issues with my setup: (1) a perpetual rich condition with my carter carb (could never get that adjusted right, so converted to FI), and (2) the exhaust pipe to exhaust manifold connection was loose which allowed fresh air into a hot chamber with not-fully-combusted fuel/exhaust gas mixture. Not sure if either of those were the real cause, but I'm sticking with that as an explanation.
 
thanks for the help , my engine does not have a smog , I will check the exhaust for leaks and loose bolts , I know carter carbs are a pain but it has been runnng fine up until about 3 weeks ago . thanks again for the help
 
I worked on the jeep today , all the exhaust and intake bolts were a little lose plus a clamp in front of the muffler was real lose . all tighten up and quiet . many thanks guys for your advise
 
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