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A26B · 07-22-2007

What concerns me about this, is the fact that you can hear detonation. I would expect the knock sensor to detect knock & back out advance timing. Marc's tune may be optimizing A/F to make the engine develop more power, but would still be controlled by ECM knock sensing.

Failure of a knock sensor should throw a code and prevent open loop performance. I would be looking into replacement of the knock sensor or checking the lead/connection.

Youe OEM chip may be "fat" enough to prevent the knock, but wouldn't develop the hp Marc's chip would.

07-22-2007	#5
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,401	Re: Problems with Detonation after Plugs What concerns me about this, is the fact that you can hear detonation. I would expect the knock sensor to detect knock & back out advance timing. Marc's tune may be optimizing A/F to make the engine develop more power, but would still be controlled by ECM knock sensing. Failure of a knock sensor should throw a code and prevent open loop performance. I would be looking into replacement of the knock sensor or checking the lead/connection. Youe OEM chip may be "fat" enough to prevent the knock, but wouldn't develop the hp Marc's chip would. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.