Question on BMW 3-Series E36 O2_Sensor

1996 328ic
Runs rough low power all speed's esp up hill, low tone exhaust pop on decel.
bank1 sensor2 code only after 40+ miles 65mph++
1. Bad hose at icv replaced and cleaned moves back forth ok, ran smooth aprox 30 miles
2. Replaced ccv and hoses good another 30 miles
3. New plug's NGK BKR6EQUP , bremi boots and fuel filter, both throttle body gaskets no change
4. New maf boot and hoses all ok ran good again for about 30 miles
5. New intake gasket checked replaced all vacuum in around manifold. no change
6. new bremi coils. no change



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[Nick at Pelican Parts]

A pop in the exhaust indicates a timing issue or excessive back pressure. I would check exhaust back pressure to start. If good, check engine mechanical timing.

- Nick