Spark knock, detonation, pinging... IDK

[5.0]

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1996 K1500 Suburban 5.7, 204,000 miles

Under hard acceleration I can hear a noise from the engine, sounds kind of like detonation. No engine codes. I got a code about a year ago for an EGR related problem, but never since.

Fuel pressure is 55 engine off, 52 engine idling, and 60 if I put it in gear and give it gas while holding the brake.

Does it with a stock puter and my Black Bear tuned puter. Did it before and after the following parts...

Recently replaced for other reasons... plugs, wires, cap, rotor, O2 sensors.

Where to start?

I have a ScanGauge II that has an "ignition" setting in it. can this be used to tell if my ignition is changing as it should be?


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[BRUTUS_T_HOG]

the knock sensor on the passenger side between the exhaust ports likes to come disconnected or just fail and could cause knocking.

use a timing light and watch the timing as you tap the exhaust manifold with a screwdriver.. the timing should move around when you tap.. if it doesn't its probably something wrong with the knock sensor

 

[5.0]

Thanks for the info on how to test it. I suspected the knock sensor as a potential problem and it was still connected when I looked at it although I had no idea how to test it.

I'll test it tomorrow and let you how it goes.