Detonation After Injector Upgrade And Tune Up.

Gentlemen. I have a '90 LX that is somewhat modded. Vortech S-Trim, Edelbrock heads, Gt-40 intake and a fairly tame Isky cam. It was cut on a 114 LC for the SC. It had 30 LB inj and a Pro-M "bullet" MAF. I was able to get 42's and a newer Pro-M for a very decent price this winter. After R/R injectors, I did some maintenance, plugs, wires and C/R. Plugs are 3923's and were burning real nice. "Light grey". BTW, old plugs were 15 years old. Car has 45K on body and 20K on mods. I did notice my conical filter (K&N) was pretty dirty so I cleaned it with their kit. It had a dark oily film on it. Vortech runs the line from the oil fill tube to the filter box for some reason. Now, the engine is getting "air" and when I somewhat "hit" the throttle, I hear that dreaded detonation now. I have a 255 "intank" and a T-Rex. I had the timing set at 10*, but lowered it to 8* and bumped my boost retard to 3. Still detonating. Does anyone have a direction I can start to go to remedy this. Thanks in advance.

I know what detonation is. My FP is 40 and goes to about 45 under a light load with an FMU. I have an MSD boost timing master (analog). Plugs were gapped at 35. The oil on the filter was black, not the red K&N oil. My comment on "getting air" was meant to mean the filter is now clean. It's only pinging if I hit it somewhat hard. I've tried to pull codes but I get nothing. Now a 5-speed orig. an AOD. Neutral safety switch is disconnected. Never liked them. I'm thinking that with the old 30's and that dirty filter, I was getting enough fuel. Have no idea what the A/F ratio is. ALL my sensors are original. Is there any way to test the MSD? I think maybe the fuel is suspect as it's been in the tank with StaBil since Oct. Full tank. BTW, the heads are O-ringed. Getting on a dyno at $500 w/ a kid in college is not in the cards now. Any other thoughts would be appreciated.

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