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**First c10** · 11-08-2019, 03:28 PM

First off... A dyno tune will always be the best way to set up a swap when nothing is original and will need adjusting. On my gen IV I disconnected the MAF which put the ECM in SD mode and my lean condition went away which told me that it wasn't an vacuum leak... that's not bad advice. Anyone can tell him to drop $1K on a dyno tune.(Which is good advice but doesn't really tell the OP anything about the problem).

So after the picture of the engine bay. My comment about intake size doesn't really matter since you are not using the drop in style MAF.
A problem can be the the difference between the factory air flow path and the current path with the elbows. Nothing a good tune can't remedy, but at least you can eliminate the vacuum leak or air sucking in at an exhaust leak upstream of the O2.
Just my .02!

11-08-2019, 03:28 PM	#14
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,706	Re: Codes :"Bank 1 Lean Bank 2 Lean" First off... A dyno tune will always be the best way to set up a swap when nothing is original and will need adjusting. On my gen IV I disconnected the MAF which put the ECM in SD mode and my lean condition went away which told me that it wasn't an vacuum leak... that's not bad advice. Anyone can tell him to drop $1K on a dyno tune.(Which is good advice but doesn't really tell the OP anything about the problem). So after the picture of the engine bay. My comment about intake size doesn't really matter since you are not using the drop in style MAF. A problem can be the the difference between the factory air flow path and the current path with the elbows. Nothing a good tune can't remedy, but at least you can eliminate the vacuum leak or air sucking in at an exhaust leak upstream of the O2. Just my .02! __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!