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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 09-21-2007
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Biz Biz is offline
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To lean?

well i hooked up a diagnostic machine to my truck and said it was running to lean.it could be my fuel injectors ,mass air flow sensor or a 02 sensor.how would I know which is the problem?the o2 seems more common then anything
I might just replace it all since it was someone elsew truck and don't know what they changed and didnt.your take?
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Old 09-23-2007
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It's usually a vacuum leak when you get those codes.

Rich
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Old 09-23-2007
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I just changed my o2 sensors, it was a major PITA. It took ALL DAY and of course nothing went easy. Believe me, you're better off investigating other reasons FIRST (like a vacuum leak) before replacing those sensors.
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Old 09-24-2007
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what air/fuel do you consider "too" lean and from where did you take your readings?
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