Both banks running lean? - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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  #1  
Old 10-03-2009
yellow rhino's Avatar
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Both banks running lean?

Ok so so far I have cleaned my MAF do to my K&N and for the life of me I cant find a vacuum leak. Maybe Im just a idiot but I cant find it. Any other ideas of what could be causing this?
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Old 10-05-2009
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Help? Lol im going nuts
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Old 10-05-2009
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hopefully this solves the problem

https://www.ranger-forums.com/forum2...ommon-cel.html

I had this problem, if your truck is 4.0 this will cause the check engine to come on with both banks running lean.

EDIT: just saw your sig. maybe this isn't the problem, couldn't hurt to check for a leak in those rubber elbows though.
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Old 10-05-2009
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Use a stethescope, or look at your STFT's.
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  #5  
Old 10-05-2009
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Ya its a 3.0. I checked my hoses anyway but didnt come up with anything.

What are STFT's?
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Old 10-05-2009
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Quote:
Originally Posted by yellow rhino View Post
Ya its a 3.0. I checked my hoses anyway but didnt come up with anything.

What are STFT's?
short term fuel trims
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Old 10-05-2009
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Short Term Fuel Trim

Edit: You win.
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Old 10-05-2009
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hmm I have no idea what that means lol. Also I have been getting horrible mpgs...
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Old 10-05-2009
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have you measured your vacuum?

I measured my 2.3 the other day (after fixing 3! vacuum leaks with a p0171 code) and got 21.5 inches.

If you have a noticable vacuum leak you should be able to notice it on a gauge.
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Old 10-05-2009
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o2 sensors?
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Old 10-05-2009
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i had this problem with mine and it had a tear in the pcv hose... its on the back of the intake manifold
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Old 10-15-2009
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why not try using an aresol brake parts cleaner to locate the suspected vacuum leak? I use this method often with excellent results. FYI dont spray the exaust (fire hazzard). You will know if you hit a spot that has a vacuum leak as the engine idle will change.
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Old 10-16-2009
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Quote:
Originally Posted by drw1710 View Post
why not try using an aresol brake parts cleaner to locate the suspected vacuum leak? I use this method often with excellent results. FYI dont spray the exaust (fire hazzard). You will know if you hit a spot that has a vacuum leak as the engine idle will change.
Brilliant deduction Watson! j/k lol
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