Spark knock.... wtf - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240silvia · 06-26-2008, 07:59 PM

93 ka24de NA w/ 4100 miles

So I have some spark knock aka, detonation going on in my motor. This is what I have done...

New fuel filter
New plugs
sprayed carb cleaner all over the intake mani to check for vac leaks, the idle didn't change, so it's not that
fuel pressure regulator has plenty of vac
secondary butterflies has plenty of vac
93 in the gas tank
I put seafoam through the fuel tank and also through a vac source.

the car runs PERFECT at idle. When I go to take off, up to about 30% throttle I have a lot of spark knock. Over 30% throttle, it pretty much goes away. WEIRD!!!!!!!!! I went for a drive down the street, pulled the first plug, and it was WHITE!!!! It's running lean as hell!

I have a few friends that thing it's a fuel pump going out. Any suggestions?

06-26-2008, 07:59 PM	#1
240silvia Nissanaholic! Join Date: Jul 2002 Location: Wilmington NC Age: 40 Posts: 2,060 Trader Rating: (3) Feedback Score: 3 reviews	Spark knock.... wtf 93 ka24de NA w/ 4100 miles So I have some spark knock aka, detonation going on in my motor. This is what I have done... New fuel filter New plugs sprayed carb cleaner all over the intake mani to check for vac leaks, the idle didn't change, so it's not that fuel pressure regulator has plenty of vac secondary butterflies has plenty of vac 93 in the gas tank I put seafoam through the fuel tank and also through a vac source. the car runs PERFECT at idle. When I go to take off, up to about 30% throttle I have a lot of spark knock. Over 30% throttle, it pretty much goes away. WEIRD!!!!!!!!! I went for a drive down the street, pulled the first plug, and it was WHITE!!!! It's running lean as hell! I have a few friends that thing it's a fuel pump going out. Any suggestions?