I have a 1998 Subaru Legacy OBW.  I did the EJ25 to EJ22 swap years ago.

 

I'm getting a rhythmic bang/popping sounds that really gets loud when accelerating. It can be felt throughout the car and it can be heard a little (although not near as much) when I let off the gas.  It sounds like this:

 

 

I replaced the front drivers side shaft with one from Advanced several months ago, although the symptoms were different.  Any ideas what I should check for this?

 

Thanks in advance!

Edited June 6, 20169 yr by ryanw

That is one strange sound. Have you looked at the driveshaft? Noise sounds rotational. 

rebuilt half axles are notoriously unreliable - that would be the first suspect.

rebuilt half axles are notoriously unreliable - that would be the first suspect.

+1, I have had my share of poorly rebuilt half shafts over the years. I too, suspect a bad half shaft.

Thanks guys. I replaced both half shafts today (one at a time) for troubleshooting and still have the same problem. Happens in reverse or forward. Is the drive shaft the next thing I should swap?  I've never worked with a drive shaft before. It looks/feels fine to my untrained eye. Anything in particular I can check before pulling it?  Could it be a problem in the transmission itself instead?

Edited June 7, 20169 yr by ryanw

Shook the hell outta the drive shaft and turned it as fast as I could and could not get the symptom to appear.  I put it in FWD mode and that did not change the symptoms at all.   Anything else that could make that noise?  It sounds like its in the front center... which is why I tried swapping both CV axles. 

maybe check the rear bushings on the lower control arms.

 

make sure the stub axles are seated completely.

any progress on this?

Was the differential.  Finally gave out after 320,000 miles lol.  Got a new car (well, used car, but new to me).  Thanks for the help.