Suzuki Vitara RT-S 2016 pinging issue
 

Hi All,

I own a 2016 suzuki vitara rt-s 1.6 (AT) and has 96000km on it, I've noticed the engine tends to ping (detonation, sounds like a marble in a jar) ocassionally, say when going up hill, especially when it tries to pickup it seems to hesistate and starts pining briefly for 2/3 seconds and it goes away as it gains speed, i think with higher octane (95 here in AU) fuel it's not that bad. Can anybody adivse what can it be, is it a common issue with vitara, has anyone had the similar issue and what was the solution, Ive tried changing spark plugs, thick engine oil, have used injector cleaning additives few time as well as carbon clean the piston(liqui moly) once recently, It has been regularly serviced, some one suggested maybe a bad knock senor but i dont get any errror also with a OBD2 scanner. Ive tried taking it to a mechanic and they all say they can't replicate the issue and advise to use higher octane fuel. I know the issue is there but not sure why instead of trying to fix it they rather insist they cant find any fault. I know it's not good for the engine and I myself find it very uncomfortable when it does that. I mean I can use higher octane but that is only going to mask the issue. Any advise will be highly appreciated.

Also ive done a visual check on the knock sensor for any visible damages, it looks pretty neat, I could have replaced it but since it was a complicated task (remove intake manifold etc) and I'm not that experienced could'nt do it.
Here's the reading from the scanner, any red flags [img]data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7[/img] ??

Scanner reading at idle engine warm (RPM 637-655)
DTC_CNT: 0
FUELSYSA: CL
FUELSYSB: --
LOAD_PCT: 20 to 20.8%
ECT: 185 to 195 °F
SHRTFT1: 0 to 3.1%
LONGFT1: 0% constant
MAP: 8.27 inHg constant
VSS: 0.00 mph
SPARKADV: 6 to 9.5
IAT: 131 to 133 °F
TP: 11.4%
02SLOC: B1 S1 2 – and B2S----
O2S11: 0.08 to 0.69 V
SHRTFT11: 0.0 to 3.1 %
O2S12: 0.45 to 0.46 V
SHRTFT12: 99.2% constant
EVAP_PCT: 0.0%
BARO: 29.23 inHg constant
VPWR: 13.54 to 13.68 V
LOAD_ABS: 15.3/15.7 %
TP_R: 1.6 % constant
TP_B: 11.0/11.4%
APP_D: 14.9% constant
APP_E: 7.5% constant
TAC_PCT: 2.0/2.4%

Scanner reading at load/running (RPM 600-2600)
DTC_CNT: 0
FUELSYSA: CL/OL-Drive
FUELSYSB: --
LOAD_PCT: 16 to 82%
ECT: 192 to 201 °F
SHRTFT1: -4.7 to 4.7%
LONGFT1: 0.0% constant
MAP: 7 to 23.9 inHg
VSS: 0.0 to 48 mph
SPARKADV: -19 to 20
IAT: 123 to 150 °F
TP: 11 to 83%
02SLOC: B1 S1 2 – and B2S----
O2S11: 0.0 to 0.75 V
SHRTFT11: 0.0 to 3.1 %
O2S12: 0.45 to 0.46 V
SHRTFT12: 99.2% constant
OBDSUP: EOBD
EVAP_PCT: 0.0 to 14% and one 100% burst in 24 frames
BARO: 29.23 inHg constant
VPWR: 13.2 to 13.8 V
LOAD_ABS: 12.9 to 60 %
TP_R: 0.8 to 17.6 %
TP_B: 11.0 to 28.6%
APP_D: 14.5% to 38.8%
APP_E: 7.5% to 19.6%
TAC_PCT: 1.6 to 22 %