Question about 2004 Ford F150

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2004 Ford F150 5.4l XLT 4x4. P0174 - Can't resolve! :(

2004 Ford F150 5.4l XLT 4x4. P0174 - checked for vacuum leaks but no change in idle spraying ether. Dealer replaced O2 sensor and gave up. Other dealer told me never bring it back and leave. New spark plugs. Fuel filter and synthetic oil changed evry 10k. New PCV and brake booster hoses. Mechanic says can't be PCV or MAF becuase those throw two codes (1 for ea side). Haynes manual says change every 60k in one section and 100k in major tune up section. Owners manual says PCV never needs service. It also says PCV is above intake manifold on 5.4l but mechanis say it's on passenger side valve cover even though heater element is on drivers side. Dealer wants to check over a dozen non code related items at $100/ea. I already paid then $400 for O2 sensor which I can get for $50.

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  • goracer Feb 06, 2010

    Mechanic did not mention injector flow test, variable cam timing or intake manifold runner controls or COP testing. He said he did not have time to do exhaust back pressure test. I paid 2.5hrs diagnose fee + $150 for a $60 O2 sensor as far as what is writen on the receipt. The front O2 sensor was tested but not the rear. I had planned on changing all 4 myself but was in a hurry to smog. I basically paid $400 for nothing in my opinion. He showed me a fax from Ford cord with a paragraph of a dozen or so items they want him to test at $100/hr. That's insane!!! There are no driving issues. Well ABS, but I have f & r sensors on order. No hesitation, bucking or noticable lack of power. No other codes. Has approximately 98k miles. JBA short headers and dual exhaust all the way. Lifted 7" with 37" tires. Intake consists of foam filter and strait tube replacing the chambered one.

  • goracer Feb 08, 2010

    Mechanic did not mention injector flow test, variable cam timing or intake manifold runner controls or COP testing. He said he did not have time to do exhaust back pressure test. I paid 2.5hrs diagnose fee + $150 for a $60 O2 sensor as far as what is writen on the receipt. The front O2 sensor was tested but not the rear. I had planned on changing all 4 myself but was in a hurry to smog. I basically paid $400 for nothing in my opinion. He showed me a fax from Ford cord with a paragraph of a dozen or so items they want him to test at $100/hr. That's insane!!! There are no driving issues. Well ABS, but I have f & r sensors on order. No hesitation, bucking or noticable lack of power. No other codes. Has approximately 98k miles. JBA short headers and dual exhaust all the way. Lifted 7" with 37" tires. Intake consists of foam filter and strait tube replacing the chambered one.

  • goracer Feb 08, 2010

    Code P0174 - Dealer can not resolve. Smog is past due.

  • goracer Feb 20, 2010

    Resolved:
    * Vacuum leak at exhaust manifold to precat exhaust pipe flange connectors. They did not mate level and was at a slight angle. This was enough to suck in air under exhaust velocity pressure which trigered the 02 sensor to interpret as running too lean on that bank.
    - Thank you all for your replys.

  • tech2504 May 11, 2010

    Spraying ether is NOT a good way to check for vacuum leaks. There is a large chance of engine fire. A P0174 indicates a problem with Bank 2 (the driver's side cylinder head). If Bank 1 is not also lean then you have already isolated your concern somewhat (it does not have to set a code to be "lean", the code only sets when the PCM can no longer compensate for the lean condition). Did the dealer perform a relative injector flow test? Did they check the Variable Cam Timing and Intake Manifold Runner Controls for proper operation? Does the truck have a misfire associated with this P0174 and if so, was exhaust back-pressure measured to determine if the catalyst is stopped up? We must know these things to diagnose your problem.

  • Lamberto Mendoza May 11, 2010

    what's the problem of your car pls. elaborate further

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Short of actually getting my hands on your truck to do the diagnosis myself... These are the things I can think of off-hand that would cause your P0174 and not necessarily set other DTCs.

- A faulty upstream Bank 2 O2 sensor or wiring (though you already have this base somewhat covered and Ford O2 sensors are tough, usually don't see failure except in cases of contaminated fuel or excessive use of over-the-counter fuel additives)

- A bent, disconnected, or broken Intake Manifold Runner Control rod or butterfly assy on Bank 2

- An exhaust leak on Bank 2 (esp. since you mentioned headers)

- An intake manifold leak either at the gasket or injector o-rings on Bank 2

- A weak or partially stopped-up injector(s) on Bank 2. Though I find this unlikely since you mentioned there was no misfire.

- A plugged or restricted Catalyst on Bank 2. Also seems unlikely given that you do not experience misfire or low power concerns.

- A faulty Powertrain Control Module. This option, though not unheard of, is VERY unlikely in my experience with these trucks.

If I think of anything else I will let you know. I wish that I could help more, remote diagnostics without all the needed tests and information on a problem such as this amounts to little more than conjecture.

Posted on Feb 09, 2010

Testimonial: "Nicely explained and usefeull information."

  • tech2504 Feb 24, 2010

    I'm glad that I could help you out :) Did you have to go back to the dealer or were you able to find it on your own?

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Remove the MAFS / IAT sensor and clean with MAFS safe cleaner.

Posted on Feb 05, 2010

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Clean throttlebody

Posted on Feb 04, 2010

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