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P0171 on 01 Echo with 19.5+ LTFT from 2 MAFs
I have a 2001 Echo with about 185,000 miles on it. The car has been giving me intermittent P0171 codes and I have resolved to fix it. I purchased a BlueDriver scanner but the code hasn't come back since I bought the scanner. I do, however, observe a pretty steep LTFT of 19.5+ and cannot seem to figure out why this is happening.
So far, I have:
Cleaned the original MAF with MAF cleaner - no change.
Replaced the MAF with a Walker aftermarket MAF - no change, same LTFT value.
Replaced the intake manifold gasket - no change
Visually and physically inspected vacuum lines - no cracks were found.
Liberally sprayed carb cleaner around gasket mating surfaces and hose connection points - no change
Replaced the PCV - no change
The air filter is not dirty. The fuel pump was replaced about a year ago. The car has power and drives normally and gets about 33mpg in combined driving.
I have attached a screenshot of the bluedriver app showed my fuel trim levels.
I would be most appreciative of your help, thanks in advance!
Last edited by priceprice; 02-26-2017 at 09:52 PM.