Popping / Rumbling on during deceleration, throttle lift, engine braking
#1
09-29-2015, 08:31 PM
Join Date: Feb 2013
Location: San Diego
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Popping / Rumbling on during deceleration, throttle lift, engine braking
Hey All,
Does anyone else's truck make a good rumble out of the exhaust on deceleration or when you let off the throttle? Not loud gunshot popping like a real dirtbike backfire, but definite popping / rumbling which i think is just muffled by the muffler. I'm 97 2500 5.9L 4x4 manual trans, nothing really wrong except drinks a lot of oil that the plenum fix didn't fix. Don't have compression leakdown numbers but I am thinking I will get them soon. I've got a magnaflow cat and possibly muffler but even before I had the magnaflow cat it did this. I will take a video to capture the sound if it doesn't ring any bells for anyone.
Is it normal or mean something is wrong?? The thing passed california smog exhaust sniffer so i can't imagine its very rich, done plug and wires and cap and rotor all recently and it never really misfires or knocks as far as I can tell.
Nick
Does anyone else's truck make a good rumble out of the exhaust on deceleration or when you let off the throttle? Not loud gunshot popping like a real dirtbike backfire, but definite popping / rumbling which i think is just muffled by the muffler. I'm 97 2500 5.9L 4x4 manual trans, nothing really wrong except drinks a lot of oil that the plenum fix didn't fix. Don't have compression leakdown numbers but I am thinking I will get them soon. I've got a magnaflow cat and possibly muffler but even before I had the magnaflow cat it did this. I will take a video to capture the sound if it doesn't ring any bells for anyone.
Is it normal or mean something is wrong?? The thing passed california smog exhaust sniffer so i can't imagine its very rich, done plug and wires and cap and rotor all recently and it never really misfires or knocks as far as I can tell.
Nick
#2
09-30-2015, 10:00 AM
#3
10-15-2015, 07:44 PM
thrush
Hey All,
Does anyone else's truck make a good rumble out of the exhaust on deceleration or when you let off the throttle? Not loud gunshot popping like a real dirtbike backfire, but definite popping / rumbling which i think is just muffled by the muffler. I'm 97 2500 5.9L 4x4 manual trans, nothing really wrong except drinks a lot of oil that the plenum fix didn't fix. Don't have compression leakdown numbers but I am thinking I will get them soon. I've got a magnaflow cat and possibly muffler but even before I had the magnaflow cat it did this. I will take a video to capture the sound if it doesn't ring any bells for anyone.
Is it normal or mean something is wrong?? The thing passed california smog exhaust sniffer so i can't imagine its very rich, done plug and wires and cap and rotor all recently and it never really misfires or knocks as far as I can tell.
Nick
Does anyone else's truck make a good rumble out of the exhaust on deceleration or when you let off the throttle? Not loud gunshot popping like a real dirtbike backfire, but definite popping / rumbling which i think is just muffled by the muffler. I'm 97 2500 5.9L 4x4 manual trans, nothing really wrong except drinks a lot of oil that the plenum fix didn't fix. Don't have compression leakdown numbers but I am thinking I will get them soon. I've got a magnaflow cat and possibly muffler but even before I had the magnaflow cat it did this. I will take a video to capture the sound if it doesn't ring any bells for anyone.
Is it normal or mean something is wrong?? The thing passed california smog exhaust sniffer so i can't imagine its very rich, done plug and wires and cap and rotor all recently and it never really misfires or knocks as far as I can tell.
Nick