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miles?
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Posted by Dean [Email] (more from Dean) on Thu, 22 Jun 2006 23:14:53 Share Post by Email
In Reply to: Re: Engine running lean, Jeremy R., Thu, 22 Jun 2006 18:14:15
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The O2 sensors are energized via fuse #38, and turned on/off via ground connections on the engine ECU. Fuse #38 is energized via the main engine relay which also powers fuse #32 via the fuel pump relay and then the fuel pump. So if the fuel pump is working, engine running, the O2 sensors will get power if fuse #38 is good and there are no wiring faults.

Inspect the O2 sensor connectors up near the thermostat and TB area.

A lean condition can be reported for reasons other than a bad sensor reading. The sensor might be working perfectly. Check for vacuum line problems.

Starts ok? if fuel pressure low at start, hard starting can occur.
Idles ok? -and steady with AC compressor loads on/off
MPGs ok?
Power ok and gets on boost? -bad MAP sensor can cause lack of power/boost, so can a bad BPC, but that never upsets mixture.

If the vac line from the TB to the FPR is bad, it will cause rich running at idle and lean on boost. This is probably the most critical hose for AF mixture. A worn or weak fuel pump can have a pressure drop under high power demands and that can create a lean condition... but I have not seen anyone ever report that, but I have experienced that on a 1978 Volvo. A badly fouled fuel pump might cause problems, but these are typically fine at 100K.

Please get CEL code numbers next time.

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