Exhaust Leak at collector, AFR misread

86ESSR

Member
Nov 14, 2019
2
1
13
Chicago
Last night i replaced my cheap header gaskets with some Percy's multi layer aluminum gaskets. Those suckers sealed right up but i noticed that i now have a small exhaust leak at the collector side after loosening them to get more room for the gasket install. Today i drove the car and my air fuel ratio gauge went into the 18 - 20s. Will a leak at the collector throw off the 02 sensor like that to cause it to read that lean?

86 Mustang
408w
image0.jpeg
 
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