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Old 02-15-2011, 02:21 PM   #1
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Default Running Lean (Bank 1 and 2)

I have been having my engine light come on to tell me the engine is running lean and Im trying to get it fixed as fast as possible before something happens. I have been talking to Corey at PHP and I might trade my superchips flashpaq in for a gryphon with custom tunes but is there anything else i can do to fix the problem or is that my only option? Thanks for the help guys.
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Old 02-15-2011, 02:46 PM   #2
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If both banks are running lean you possibly have a huge vaccum leak. I would check that out first.
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Originally Posted by obusnizzle dont touch it and play with it, just drive the truck, try not to overthink it.
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Old 02-15-2011, 03:11 PM   #3
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My intake makes alot of noise so how would I go about checking that out?
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Old 02-15-2011, 04:04 PM   #4
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While your engine is running use some starter fluid and spray it in small amounts around different areas, when the rpm raise you will have a good idea of where the leak is.
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Originally Posted by obusnizzle dont touch it and play with it, just drive the truck, try not to overthink it.
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Old 02-15-2011, 04:30 PM   #5
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Can you post the codes you are getting? But as stated before a vacuum leak is definitely a good possibility.

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Old 02-15-2011, 04:40 PM   #6
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Well I cant find a thing. Nothing seems to be leaking. I just thing its all my mods that are making it run lean. Too much oxygen so I need to find a way to even that out with more fuel. Ill check the actual code numbers when my light comes back on but it says system too lean bank 1 and system too lean bank 2.
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Old 02-15-2011, 04:51 PM   #7
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If you have a CAI without a custom tune then I would put money on that being your problem. I ask what the codes are because you are getting a lean code it may actually be rich. I have seen it the other way around on mine. Air was getting sucked in after the MAF so the computer is telling it to dump more fuel in and just screwing things up.

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Old 02-15-2011, 04:56 PM   #8
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Ill put the code up as soon as I get it again. I have a CAI and a complete exhaust. High flow cats and high flow muffler. I also recently replaced the throttle body because the old one wasnt opening all the way and since then I have been getting these codes.
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Old 02-15-2011, 05:00 PM   #9
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ahhh now the truth comes out! just kidding. My guess would be it's has to do with the throttle body or CAI. I see you have the 4.6 so they might not be as sensitive to the aftermarket CAI as the 5.4. Try spraying some starting fluid around the base of the throttle body. Could be a bad seal between the throttle body and intake or between the intake tube and TB. Hope this helps.

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Old 02-15-2011, 05:08 PM   #10
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lol sorry i forgot to mention that. I just sprayed pretty much the entire engine with starter fluid and the rpms didnt go up at all. Im thinking since before the throttle body never opened 100% it was used to that but now that it does it is sucking in too much oxygen. That stacked with my CAI and exhaust might be the problem.
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