years ago I bought into the gleam of long service life on NGK platinums bkr6egp.
recently idle has been running rough (shakes the car) so figured it was time for new plugs.
well after 45k here's the platinum spark plug gaps in mm and cylinder numbers
#2 [1.1] ------- #1 [1.6]
#4 [1.8] ------- #3 [1.2]
weird how unbalanced the gaps were...on cylinders 1 and 4 the electrode was just about gone.
#4 ground electrode was ash fouled, others look fine
installed NGK BKR6E11 coppers today set to 1.05 mm
running a little rough at idle around 600 rpm warm
gets worse at 750 rpm
smoothes out at 1000 rpm
coilpack is probably original
air filter new, knock sensor replaced not too long ago, no codes
will try plug wires and fuel filter, pcv valve
I don't think its motor mounts because the vibration was happening before the new plugs and it would come and go
could a failing cat do this?
maybe a vacuum leak somewhere
Since this is a '95 it has HLA's and therefore no valve adjustment.
going back to 30k intervals on copper plugs
Edited by 89Ru, 02 December 2012 - 08:38 PM.
reading tach wrong