Under heavy acceleration in 4th (3/4 to WOT) I heard a pop sound. Is that sound detonation. I should also mention when i heard it pop i let off immediately. Also earlier when in 3rd it sounded like it was popping. I filled the tank today with Sunoco 94 about 9.5 gallons. thank you.
Timing is at 16*. and i run sunoco 93 or 94. I took the car for a ride again and got on it and again it seems to be sputtering under full throttle. Maybe a miss it just started to do it. I just put new plugs in the other day auto 3924 and gapped them at .054. new cap, rotor, plug wires, and cleaned IAC.
yep thats detonation unless it doesn't sound like a bunch of marbles, then it could be an intake backfire. if det., then back the timing down a degree or two.
did it do it before the tune up? my 3924's are gapped to .42
My pop happened once and was a sharp yet deep pop from the engine bay...it wasn't a constant sound...I don't think mine was detonation...no marbles or nothing...
No it did not do it before the tune up.
I had a fouled plug on the drivers side 3rd one back. That is when i did the tune up.
The car was revving around 5000 in 3rd and 4th. Temps where low between the A and L in Normal. the car always runs cool.
Should i regap at .045?
I had like a popping sound 2 times. and the other time was a louder POP as soon as i heard the popping and the pop i immediately let off.
I had the car at the dyno in april and he set the timing at 16* and the A/F Ratio was good between 3000 and 6000 it was between 12 and 13.
Other than full throttle the car runs great. thanks for the continued help.
through some 100 octane unleaded in there and see if it keeps poping, if thats stops it you need a little less timing or run higher octane.Also a .054 gap is a little large maybe try to gap it down some?And try adjusting your fuel pressure.
Those 30lb injectors seem a bit big for your setup which could contribute to the fouled plug...it probably occured more at the lower rpms...and evened out nicely in the WOT stages (3k-6k)...
My spark plug gap is .45...it seems you gapped your plugs for the stock gap...yours ain't stock