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XfireZ51 · 07-24-2011

Tom,

The calibration has modifiers for IAT etc. Those richen or enlean the base fueling depending on environmental conditions. You are hearing it but I"ll bet there's knock prior to the point of it being audible. If its there at tip-in, the Acceleration Enrichment can be both for TPS and MAP deltas. The AE is the pump shot adding fuel and allowing the INT and BLMs to catch-up. It gets decayed out when everything stabilizes. If you have a scantool, can you datalog? I'd want to see what's happening to the BLMs and INT when you go to accelerate or when you go up a modest incline.
Also, pull the plugs and see if there is any indication of detonation. Depending on what plugs look like, you may want to try a colder one.
I'm assuming FP is fine and filter is clear. Is motor stock?

07-24-2011	#3
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,685	Re: spark knock problem Tom, The calibration has modifiers for IAT etc. Those richen or enlean the base fueling depending on environmental conditions. You are hearing it but I"ll bet there's knock prior to the point of it being audible. If its there at tip-in, the Acceleration Enrichment can be both for TPS and MAP deltas. The AE is the pump shot adding fuel and allowing the INT and BLMs to catch-up. It gets decayed out when everything stabilizes. If you have a scantool, can you datalog? I'd want to see what's happening to the BLMs and INT when you go to accelerate or when you go up a modest incline. Also, pull the plugs and see if there is any indication of detonation. Depending on what plugs look like, you may want to try a colder one. I'm assuming FP is fine and filter is clear. Is motor stock?