no idea 
Possessed C5....WTH
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apparently this is an issue on the Chevy Cruze.....found this on a Cruze forum...GM has no idea what the issue is but I am leaning towards the Catalytic converter being the issue.
sounds just like this...loud banging noise
sounds just like this...loud banging noise
Le Mans Master
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Safety Car
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Checks the clamps anywhere on the exhaust system and tighten them up after everything has cooled down and see if it happens again.
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Burning Brakes
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yes we do...but my question for you is did it only do it once or several times as we hear it multiple times for a couple hours after the car is parked.
Thanks for the input
Thanks for the input
Team Owner
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When I first started reading my first thought was exhaust somewhere.
Bad cats can do strange things to a car. Things also get loose over the years and just plain go bad on exhaust systems that has no reason to it.
What are the temps running? Higher temps would most definitely lead to a bad cat as a first thing to check.
when something gets hotter than normal and then cools quickly it can cause popping. The temps across the country have been colder than normal and could explain it. Especially if it's in the exhaust system somewhere as I suspect it is.
Bad cats can do strange things to a car. Things also get loose over the years and just plain go bad on exhaust systems that has no reason to it.
What are the temps running? Higher temps would most definitely lead to a bad cat as a first thing to check.
when something gets hotter than normal and then cools quickly it can cause popping. The temps across the country have been colder than normal and could explain it. Especially if it's in the exhaust system somewhere as I suspect it is.
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Several hours? 3, 4, 5? Can't see cats taking several hours to cool off. They make noise but it lessens as time passes and they cool down.
I'm not familiar with the dual tank system but I'm guessing something to do with it
I'm not familiar with the dual tank system but I'm guessing something to do with it
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Didn't read all, but if from front end, continued thump after car is shut off, could be headlight gear wearing out. My C4 did this, will do it for sometime until eventually headlight wont work at all. Motor keeps turning, doesn't know it is closed. I am guessing the C5 has a similar gear and wears out, maybe not, just a guess.
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??
OK....here's the deal. 2002 C5 and the past few months when driving and for a few hours afterwards we get a loud popping/thumping sound coming from the car 
Nothing has changed, no new mods etc. When driving it sounds like it is coming from the tunnel below the shifter or from behind the dash. It sounds like something is smacking the bottom of the car. Come home and park in the garage and it will do this periodically for several hours. It is random and there is nothing loose under the car that could cause this. We had it on the lift last week and everyone in the shop heard it but no ideas where it is coming from.
Thoughts? suggestions? dumb answers?
see video added in post #41
Nothing has changed, no new mods etc. When driving it sounds like it is coming from the tunnel below the shifter or from behind the dash. It sounds like something is smacking the bottom of the car. Come home and park in the garage and it will do this periodically for several hours. It is random and there is nothing loose under the car that could cause this. We had it on the lift last week and everyone in the shop heard it but no ideas where it is coming from. Thoughts? suggestions? dumb answers?
see video added in post #41
