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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 09-23-2009
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Icon5 my 4.0 has no power...

one day driving along i had lost all power like could barely climb small hills in first then on my way home it was spraying oil so i had checked pcv valve thing and replaced it now truck runs great but has no power still cant figure out why
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Old 09-23-2009
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Fuel filter ever been replaced?
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Old 09-23-2009
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not sure but was on my list of things to check tomorrow along with clean mass air flow
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Old 09-23-2009
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3.Slow FTW! lol

Sucks about your problem though, get those things checked.
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Old 09-23-2009
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i got a 3.0 its in my 98 ranger lol
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Old 09-23-2009
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also probably check your catyletic converters, if their stoped up you'll loose power. not 100% but if you run the truck until it's warm and check them, if their cherry red then they their stopped up.
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Old 09-26-2009
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well i checked everything out now the truck is burning oil and constantly dumping oil into my intake dont have a clue why but also if you blow into my valve vent and open my throttle air comes out the intake
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Old 09-26-2009
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stupid question(s)... please forgive me.

Did you change your own oil the last time or have someone else do it?

This is where it gets really stupid...

Did you drain, or watch someone else drain the old oil before adding the new?

If there is too much oil in there, your truck symptoms are exactly what happens.
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Old 09-26-2009
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Hook up a vacuum gauge. 17-27 in. Hg at idle is what you should get. The higher the better.

No vacuum = no power. I know because I've blown a vacuum line once and I had to have the throttle at WOT to even get around.
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Old 09-26-2009
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i had previously changed my oil but i have some wild guess that seeing how my pcv valve went it pressurized my valves and blew out the seals
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