2001 4.0 4x4 running rich HELP - Ranger-Forums - The Ultimate Ford Ranger Resource


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

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Old 07-22-2010
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2001 4.0 4x4 running rich HELP

Ok calling all experts. This vehicle belonged to a Napa Valley vineyard it developed problems that the company mechanics couldn't fix, no repair history given. Vehicle was sold off bought "as is" come tow it away. Well I have several hours in to it and cant seam to get it diagnosed. Here's what i know.

1 Running super rich - black- hot exhaust- pre-cat at 900 deg.
2 no codes unplugged air flow meter no change in running no check engine light
3 Unplugged throttle position sensor - no code set
4 At idle in park odometer is registering miles
5 spark plugs black

I unplugged to fuel pressure regulator - no fuel leak to vacuum line

Any advice other than JUNK IT

Thanks Marc
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Old 07-24-2010
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sounds like a bad fuel pressure regulator or some injectors dumping fuel.
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Old 07-24-2010
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x2 on the bad pressure reugulator
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