TRUCK 99 PROBLEM PLEASE HELP ASAP

1999 Ford Ranger

Tiny

dodge287

January, 18, 2014 AT 8:55 AM

Hi I have a 1999 ford ranger 3.0 v6 flex fuel I have 2 codes p0171 and p0174

both banks to lean no I changed the maf sensor bought new one changed gas cap I smoked the truck to to see for vacume leak but nothing idk what it is please help

FOUND 692 RELATED QUESTIONS

9 Answers

Tiny

saturntech9

January, 18, 2014 AT 9:18 AM

Where did you put the smoke in at?What kind of smoke machine set up did you use?It wasnt a Halloween fogger was it?Sounds like a vacuum leak somewhere to me did you check fuel pressure yet?

Tiny

Wrenchtech

January, 18, 2014 AT 9:54 AM

Saturntech9 is correct here. I see these codes on Fords quite often and it's nearly always a bad vacuum leak, usually the PCV hose or large connector at the manifold.

Tiny

saturntech9

January, 18, 2014 AT 11:06 AM

Also the pcv grommets get worn and the pcv no longer stays in the valve cover.

Tiny

Wrenchtech

January, 18, 2014 AT 11:32 AM

They're biggest problem is the rubber deteriorates from the oil fumes and the vacuum will suck a hole right through the hose that may not be visible with the engine off. Listening is the best way to find it.

Tiny

saturntech9

January, 18, 2014 AT 12:14 PM

I like my homemade smoke machine I made with a old paint sprayer and glow plug.

Tiny

2Carpros Max

January, 19, 2014 AT 1:32 AM

Mi checked fuel pressure it was almost 30 psi.

Dodge287.

Tiny

Wrenchtech

January, 19, 2014 AT 6:34 AM

There is a major problem. The spec for this engine is 379bar (55 PSI).

You can finish here Louie. I just wanted to help you with the spec.

Tiny

zalatoy

November, 4, 2014 AT 10:39 AM

I have the same scenario! How did you solved your problem? Please let me know.
Thx

Tiny

zalatoy

November, 4, 2014 AT 10:45 AM

I have 99 ranger 6v 3.0 flex fuel same codes p0174 and p0171. I checked my pressure and it was around 33 psi. How did you solve your problem Dodge287? Fuel pump or fuel injection damper?

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