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O/T ford f 150 4.6

Discussion in 'Uncategorized Threads' started by maclellan1911, Jun 17, 2008.

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  1. maclellan1911

    maclellan1911 TS Member

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    TRON or Ford techs O/T ford f 150 4.6

    I got a 99 f150 in today on a referral. Has a lean mix bank 1 and 2 codes P0171 172. Any way this truck has been through the mill. New MAF new O2 sensors fuel pump and filter tune up. What I found is on the back of the intake there is a servo the runs to a shaft going into the intake( I am assuming this is the wide open throttle valve actuator? Any way it seems to be pulling some vacuum through there? Is this normal or is there a limit to how much this may leak? any ideas
     
  2. Delbert

    Delbert TS Member

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  3. maclellan1911

    maclellan1911 TS Member

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    kinda for the ford guys.
     
  4. kehrby

    kehrby Active Member

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    I don't know about no servo running to no shaft but I do know there is an elbow connected to a plastic tube that is connected to the PCV valve that likes to deteriorate and leak vacuum. This cannot leak at all or it will cause a lean condition. Replace the tube, available at your Ford dealer, and you will be fine

    Steve
     
  5. fordtech

    fordtech TS Member

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    Are you sure that this is a 4.6 and not a 4.2.Is it a v6 or a v8.It sounds like you are describing a 4.2 v6 and these have the secondary throttle shafts you talking about.Yes they will leak a little but not enough to cause lean codes.check the pcv tube and connections closely. They are also know for intake gasket leaks.One other thing is their may be a pcm recalibration for this i cannot besure with out running a OASIS report.Have you checked fuel pressure to be sure it is in specs?And also the volume of fuel?If you get me the vin number i can run the OASIS and check for the possible recalibration.Let me know if i can assist you any more. Don Cummins
     
  6. maclellan1911

    maclellan1911 TS Member

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    Yes sorry it is a 6cyl. so used to 4.6s just wrote it automaticly. problem being is this guy has already done all this work with no fix. Now he is at my door not wanting to spend any more money? truck has 175k on it. I will get the vin#
     
  7. JB Logan Co. Ohio

    JB Logan Co. Ohio TS Member

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    No disrespect to fordtech but you might try "Ford truck enthusiasts" forum page(s). They have ALL kinds of information on ALL ford trucks. Have been a member on there for many years. Very good people. Kind of like TS.com for us trapshooters!

    JB=Jerry Beach 8503917
     
  8. maclellan1911

    maclellan1911 TS Member

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    Problem solved, customer does not want to pay for time to check out. Love this crap he has dumped about 1800.00 into this thing. Is referred to me. I am by no means the fastest tech but eventually find the problem. Now he wants mr to wave the magic wand, poof fixed. Our shop is primary general repair. Brakes,suspension,maintainace ect. I will take on these "been everywhere but no one can fix" from time to time. dont know about you guys but info,wire diagrams, specialty tools are getty harder to get.
     
  9. fordtech

    fordtech TS Member

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    maclellan1911,I work in a Ford dealership.Have access to all ford service manuals,wire diagrams,ford technical hotline ect.We have mitchell on demand for other brand cars,and yes your right the aftermarket world of service info is very much lacking.They give just enough info to get buy if you are patient and willing to try.Also todays economy is as such that more people are coming in and wanting it checked out then say i will do it myself or i got a friend that will do it.Then they come back after it is hacked up and say you guys miss diagnoised it.For specialty tools try tooltopia.com or try rotunda.com for ford tools. Don Cummins
     
  10. maclellan1911

    maclellan1911 TS Member

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    Im in a 4bay do all shop........today was bad coil day. ford, honda , and a first scion. all in all we replaced 12 coils today. thats alot for us.
     
  11. maclellan1911

    maclellan1911 TS Member

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    fordtech...I gave him nothing. My first boss taught me this. 40 i fix 50 i fix you watch 60 you fix i watch 100.00 you tried to fix now want me to fix it. I do not mind diag. for the DIY'er. As long as they pay. I told this guy I would look it over for 1hr@90.00. heck I found that leaking valve shaft in the rear with out trying. but like you said this is a unlikely source of the troubles. he's been chasing this lean mix for 1.5years now he's up for a emissions test this year. I know he will be back. With all that been replaced I have a funny feeling those lower gaskets are sucking air 175k on it Im sure they are as crumbly as peanut brittle! I also suspect the aftermarket O2's. We have had nothing but problems with the aftermarket parts ALL OF THEM. I have a new saying NEW MEANS NOTHING!
     
  12. kehrby

    kehrby Active Member

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    Especially with aftermarket parts which if you notice are usually made in china or some other who knows where! You cannot trust them at all.

    Steve
     
  13. 12Gagejon

    12Gagejon Member

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    Another reason I was thinking it was a v6 my 97 e150 4.6 v8 has 4ea. O2sensors Jon
     
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