'00 4.0 running bad update - 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 09-18-2007
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'00 4.0 running bad update

After another can of seafoam, replacing the PCV (was shot, real shot) and yet another garage visit, we may an answer to the rough running & poor fuel economy (11 mpg at yesterday's fill up.) They said the fuel pressure regulator is f**ked up. its running about 10 psi over normal, which could cause the rough idle & bad mileage. They won't know more until they fix that, which will cost about $385. Any thoughts?

Last edited by sams dad; 09-18-2007 at 02:40 PM.
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Old 09-19-2007
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That could explain it. Seems like an awful lot of money.

Rich
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Old 09-19-2007
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Here's a thought: Make sure the people working on your truck understand that the returnless fuel system used on '98+ Rangers operate at a higher pressure (64psi +/- 8psi) than a regular return system.
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