Accet GLS raer cracking and banging noise - help. Review on Hyundai Accent

Hi Experts,

Your valuable view can make be bring out of sleepless nights.

I own an used 2002 Accent GLS, superb performance till date with more than two instances of long drive where one crossed 2000 km stretch. Not a single instance an issue faced or car not responding.

With recent history of it being converted to CNG, it added a feather to my HAT as the above described trip of fascinating 2k+ kms was on CNG and boy, just impressed with the mileage and overall performance.

Coming back to the dark hours where I and my car currently belong. Post application of kit, our agent suggested us to get car rear suspension uplift for better performance and load management(its part of the complete kit process as

per the legend). Giving a second thought of it and going by words of co-passengers positioned in rare, about car lowering a bit with a bit of wavy movement, a final call was taken to go for the uplift.

My accent went through the activity and results were quite horrifying for me. since the day of the uplift  (2" over existing) my car is continuously making cracking and banging noise while driving with mild noise of spring felt too from rear lower part. The guy who fixed the 2" plates(rubber) attached just behind the rear seat extreme corner's(both ends), told that the suspension was LEAKED, no more wasting of time. Had them replaced and eagerly awaiting my test run post fixing. But the problem stays. The Guy who fixed the uplift has brilliant idea for me in store. he said " please show it to some other mechanic as I cannot diagnose it any further."  and till date I am in shock of what has made my car make such bad sound from rear.

HAVE YOU GUYS CAME ACCROSS SUCH ISSUE?

IS THERE AN FIX TO MY PROBLEM?

PLEASE HELP.

Thanks.