imported_clayboy_99

Hey Ive got a 97 civic si. Stock D16y8 other then intake header highflow cat. When cold the car bogs on acceleration but once above say 3500 rpm it takes off. I recently change the spark plugs with the reccomended NGK ZFR5FGP plugs. I checked them today and the electrode is very clean but a chalky white. What would cause it to run lean like this and would it have anything to do with the bogging?

zeeman

iTrader: (1)

chaulky white? Do they smell sweet?
Could be burning coolant.

Any way you could take a picture of the plugs?

imported_clayboy_99

ya theyre white like that but are clean, no deposits or anything. I have been watching coolant levels and havnt seen any decrease.

Im working on pics for you

chris_si98

are all four plugs white? If they are.. chances are you're running lean. It'd change the fuel filter if you haven't lately. If that doesn't solve it, time to diagnosis fuel delievery

imported_clayboy_99

ya, they all are. No one cylinder is any hotter then the other.