system lean codes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

11-10-2023, 10:07 PM

truckdude239

Senior Member

Join Date: Sep 2005

Location: Lewisville, Nc

Posts: 10,217

Re: system lean codes

Quote:

Originally Posted by cj847

I am curious what you found as the final solution.

I had a situation where my LTFT was +25 both banks. Couldn't find any vac leaks. Checked live data and was getting believable readings from O2, MAP, and MAF.

I pulled a MAF off of another vehicle and installed it. LTFT immediately improved to +8 to +15 range. Apparently the MAF was giving a reading, it just wasn't correct, no matter how much I cleaned it.

I have not even messed with it i do have a new dephi maf i need to install i just havent had the chance to yet

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