[HOLYBAI]

Hi everyone, I had this shaking/rocking issue with my E34 530i V8.
problem description as follow :

Engine shaking between idle to around 2000 rpm, then shaking dissapear above 2000rpm. it is not a vibration but shaking. at idle the shaking speed is .... like saying " ew ( nasty ) 3 times in 1 second.. so : ew ew ew in one second. the shaking can be seen and can be felt when touching the engine and while sitting in driver seat like riding a horse when the horse is walking fast but not running

things i have checked and replaced with new oem part
1. full engine dissasemble to clean and inspect all parts
2. all HVA has been replaced
3. main bearing and conrodbearing replaced
4. compression test result : all 8 cyclinders are equal @ 180
5. injector test : all equal spray
6. ignition coil and sparkplug tested OK
7. no misfire faultcode
8. maf tested OK
9. all seals are renewed, no vacuum leak
10. idle stable @ 700rpm and go up abit when a/c is on - no erratic idle
11. new fuel pump
12. new fisco fan
13. new brake bomb
14. new clutch set
15. new waterpump
16. engine temp : normal
17. fuel consumption : normal

engine power seems to be ok. power is smooth all the way to the redline but there is one glitch that i notice : engine seems to drop when a/c compressor engaged so you have sudden engine braking sensation when ac compressor engaged. normally you do feel engine drop a bit when ac ON but in my case it is so severe to the level of engine braking ( the car actually slowed down and you need to add more gas pedal )

a/c compressor is OEM and in a good health ( compressor bearing is good and AC is ice cold even in the hottest summer day )

any help appreciated, sorry for my bad english as its not my native

Thank you