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Scargoes · 11-21-2018, 01:22 PM

I'm sticking by my previous mention, This is an electrical problem. Damage to wiring, sloppy CAI install, AFR on dyno sheet is wonky (18:1 from 3-4 k rpm then slowly climbing to about 11:1 at 6100 rpm). The three things I'd verify first are that the proper tune was installed with the CAI(GM did say that the change in MAF location effects the vehicle and needs a new tune), make sure the wires in the connector are not damaged and check the terminals in the connector to make sure they aren't deformed, Check the MAF with a known good one if possible.

A plugged cat, unless it's a secondary cat, should set off a MIL. I don't think a plugged cat nor low compression would make the AFR vary so drastically and in the exact same pattern for 3 dyno pulls.

11-21-2018, 01:22 PM	#69
Scargoes Drives: 2018 Hyper Blue 2SS 1LE Join Date: Aug 2018 Location: Dessert Posts: 516	I'm sticking by my previous mention, This is an electrical problem. Damage to wiring, sloppy CAI install, AFR on dyno sheet is wonky (18:1 from 3-4 k rpm then slowly climbing to about 11:1 at 6100 rpm). The three things I'd verify first are that the proper tune was installed with the CAI(GM did say that the change in MAF location effects the vehicle and needs a new tune), make sure the wires in the connector are not damaged and check the terminals in the connector to make sure they aren't deformed, Check the MAF with a known good one if possible. A plugged cat, unless it's a secondary cat, should set off a MIL. I don't think a plugged cat nor low compression would make the AFR vary so drastically and in the exact same pattern for 3 dyno pulls. __________________ 2018 Hyper Blue Metallic 2SS 1LE with Nav, PDR, and track alignment 1:28.95 Willow Springs Big Track