i didn't checked the plugs that are on my car since last month, but this evening i took a look closer at the plugs that were previously installed in the car ...
here is what i found on NGK website :
also :Misfires
A spark plug is said to have misfired when enough voltage has not been delivered to light off all fuel present in the combustion chamber at the proper moment of the power stroke (a few degrees before top dead center)
A spark plug can deliver a weak spark (or no spark at all) for a variety of reasons...defective coil, too much compression with incorrect plug gap, dry fouled or wet fouled spark plugs, insufficient ignition timing, etc.
Slight misfires can cause a loss of performance for obvious reasons (if fuel is not lit, no energy is be-ing created)
Severe misfires will cause poor fuel economy, poor driveability, and can lead to engine damage
Fouling
Will occur when spark plug tip temperature is insufficient to burn off carbon, fuel, oil or other deposits
Will cause spark to leach to metal shell...no spark across plug gap will cause a misfire
Wet-fouled spark plugs must be changed...spark plugs will not fire
Dry-fouled spark plugs can sometimes be cleaned by bringing engine up to operating temperature
Before changing fouled spark plugs, be sure to eliminate root cause of fouling
Dry and Wet Fouling
Although there are many different cases, if the insulation resistance between the center electrode and the shell is over 10 ohms, the engine can be started normally. If the insulation resistance drops to 0 ohms, the firing end is fouled by either wet or dry carbon.
And this is how bad my plugs were looking :
(check HiRez to see it clear ! lot of carbon deposit)
Hirez : http://images.fotki.com/v10/photos/1/17 ... IMG-or.jpg
I don't really know what to thing about all of this ... my brain is still computing datas
Data to Compute : I have hesitation probs over 4000rpm, above 9psi. at 8psi car runs great .. when i unplug the BOV return hose and leave it open (which leans the air/fuel mix) car runs great over 9psi,but probs seems to come back (but very very minimal) at 10psi, there is traces of oil in my intake ducts, Air Filter is K&N.
New questions to my mind : Coil pack not delivering enough power ?
I'll try to remove the 1 months old ones and see how they are looking tomorrow.....
