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Re: Service Engine Soon
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Originally Posted by S13wanabe
Ok, I know this has come up before, but I have been hearing different things fro different people. The engine has over 300,000 miles on it. Yes that is on the original motor with no rebuild. The only thing that has been done is I replaced the intake manifold gaskets. It is a 1996 with the 350ci motor. The engine still runs strong but burns about 3/4 a quart of oil every 1,000 miles. A recent thing I did to it was the K&N intake (FIPK gen 2). It was fine for a couple days, then I got the light and decoded it to reveal P0171 lean bank 1. One of the exhaust manifold bolts by cylinder 1 is broken off, and some guys are telling me that is what is causing the code. Is that possible? The service engine soon light has turned off for about a hundred miles and turned back on. This process seems to continue being the trend. I haven't tried the elctric parts cleaner yet, but I did read about it and will try it. Also does anyone have the torque specs for the exhaust manifold bolts. Thanks for the help.
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An exhaust leak before the O2 sensor can cause the O2 sensor to read a false lean condition and the PCM will compensate by attempting to adjust the fuel trims.
If the PCM cannot compensate for the false lean condition, the MIL will come on.
I would fix the exhaust leak first..then retest.
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