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Desprately seeking advice

 
Old 10-11-2017, 12:20 AM
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Question Desprately seeking advice

I have a 2000 f250 4wd auto with 5.4l. Ive been having strange issues. 171 and 174 codes. I know lean bank 1and 2. Have checked and rechecked for vacuum leaks. and finally smoke tested. no leak. cleaned then replaced maf sensor. The truck runs great when its cold outside. If its above 75, I start to have problems. It will be driving fine then slowly loose power and eventually die. Then I turn the key off and immediately start back up. It will run fine for another couple miles and do it all over again. But like I said, If its cold outside I don't have a single problem. It also said "Drive cycle not Complete" Any advice would be greatly appreciated.
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Old 10-11-2017, 11:56 AM
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So it tells you that it's running lean (not enough fuel)... Have you checked your fuel filters, pump, etc? Sounds like it's running out of fuel to me.
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Old 10-11-2017, 12:04 PM
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Any chance O2 sensors could cause that problem?
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Old 10-11-2017, 04:12 PM
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Fuel pressure stays around 35 and fuel filter is less than 2 months old. It only does this if it's warm outside. This is driving me crazy. O2 sensors was going to be next on my list. Just wasn't sure if outside temp would effect O2 sensors.
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Old 10-16-2017, 11:33 AM
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The O2 sensor is mounted on the exhaust pipe. If temperatures affected it, then it would happen in warm or cold temps because it's always hot on the exhaust pipe.

Have you been adding any additives to the fuel? There's a thing going around where people are dropping the little cardboard wafer from the additive bottle into the tank which blocks the fuel pickup.
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Old 10-16-2017, 03:49 PM
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How new is the battery and are all the grounds clean?
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