hey there... i got a Skyline R33 with HKS Hi-power exhaust, HKS Pod filter, Apexi Turbo timer, BOV, manual boost controller... i just installed the 6 x NGK BKR7EIX spark plugs today and i seemed to get a weired noise from the engine (as if something is hitting somewhere).... after giving it a nice few revs the noise went away but the whole car is shaking when the engine in running... also the exhaust is making a funky sound (like how the old granny cars sound)... my friend told me one or more of the plugs are not firing correctly... i removed and reinstalled all over again but it seems to have no change... also unplugged and replugged the coil connectors one after the other sequentially to see if all the sparkys functioning properly... they all seem to be responsive... i am extremely confused atm... i cannot think of anything else that may cause this... also checked whether engine oil just to be sure which seems to be fine.... i just wanted to get your expert advice.... can please help me out... i bought the plugs because they were listed here to be compatible out of the box with the RB25DET... also i cannot install the stock one's back as 4 of them broke while removing as they were screwed in extremely tight... please help me out guys... really appreciate it... thanks!
http://www.skylinesaustralia.com/forums/Ng...eri-t68157.html
