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Went to the track tonight and I can't figure this out. I am getting codes p0171 and p0174. The only mod is an aftermarket intake which I know can cause this but the car would not trap any decent speeds. Will the codes play with the computer to "de tune" anything? I am just trying to find the solution so I can get the car to run strong again.
My times were-
r/t-.056
60'-1.884
330'-5.307
1/8-8.083
mph-88.61
1000-10.455
1/4-12.451
mph-111.38
Any imput would be great. The car consistantly ran 110-111 mph all night, I figured it to trap closer to 115, since I have never run it before.
What year is yours? You could be experiencing a fuel pressure drop if you have an '04 and I think it happens on the '03, also. When does it happen (rpm?)? Put a scanner on it and watch your short term fuel trims and then the long terms. Short term fuel trims that go above 14% - or + will set off the cel. Or if you have another incident along with the lean condition, the cel will not wait as long to go.
If it's not pressure, did you change your injectors?