Do I need to tune anything following a dual-snorkel upgrade?
True2Chevy saw this post on cx28.com and suggested I post it here.
This past fall I upgraded the intake on my 86 LG4 (4bbl carb) from a single to dual snorkel element air cleaner. Almost immediately since swapping out cleaner assemblies (including all of the vaccuum lines), my "Check Engine" light would go on during highway speeds (70+ MPH) and go off during "city" or "bumper to bumper" traffic. It always came up code 44 (lean).
I had asked if there was any retuning you had to do as the engine and carb were getting more air. The popular concensus was the primitave computers would compensate. The lean most likely is a weak O2 sensor. Since they only run $20 I can probably put the car on ramps (let it cool) and replace it.
Other than a leak in the engine, do you think the lean condition at highway speeds only could be caused by anything else? Do you know if I need to tweak anything after upgrading the air intake?
Thanks.
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Daily Driver: 2011 Ford Expedition EL (4 very tall kids means suck it up for a while)
Crisis Car: 1986 Chevy Camaro IROC: 5.0L 4BBL Carb, 5-speed, T-tops, "Good afternoon officer how fast was I going" red.
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