Rough idle? P0171, P0174? Here's what you need to check first!!!

Discussion in 'How To Section' started by Lane24, Dec 10, 2009.

  1. ohillny

    ohillny Member

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    omg

    That would damn suck if that is the problem as I am sure you are aware that it is not the easiest repair to do. Dang but I might have to suck it up and replace them I thought about the coils to could one of those be bad ahhh I tell its driving me crazy...
     
  2. ohillny

    ohillny Member

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    I am wondering do I have the same problem I both p0174 and 71 this winter I changed intake gasket and a couple hoses. cleared codes. Ran fine up until a month ago got the p0174 code again and it has been giving me trouble starting like its not getting gas. I have fuel pressure. Any thoughts should I try fuel filter first
     
  3. bissbb

    bissbb Member

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    rough idle Lane 24 you called it!

    My 04 exped 4.6 was doing exactly as indicated - rpm drop to nearly stall when coming to a stop/idling. The 90 fitting at the top rear near firewall on the pcv line was split. Not the easiest to get to but once removed and replaced appears all is well. I would have been clueless without this being discussed on the forum. Much appreciated!
     
  4. martinek

    martinek Member

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    I had recently changed both my upstream O2 sensors and the PCV elbow. My truck ran great once again and check engine went out. I now have it running rough, wanting to stall and I get 6 codes, PO136 PO156 PO174 PO171 P1131 and PO1151. I have a 1998 Ford Expedition Eddie Bauer 4X4 5.4L Triton V8. Any and all suggestions would be great.
     
  5. Zombiehunter00

    Zombiehunter00 New Member

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    No such luck on my 2002 expy. I had the 174 and 171 codes and the truck hated the cold weather, shaking and stalling when it came to a stop. As it warmed up the problem seemed to go away- which meant the intake gasket was probably going bad. I replaced the intake manifold and the problems were solved. It seems to be a common issue with the plastic and aluminum manifold ford uses; as I replaced one on my mustang due to a coolant leak as well.
     
  6. TobyU

    TobyU Full Access Members

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    We have a 2000 that I think needs the intake gaskets too. No leaks in the other common areas. I just drive it when it's about 40. Lol Wife put up with it for 3 winters though. Slight power brake to keep idle up or N. Annoying but worked.
    She like a vehicle to function properly more than I do.
    If it an get me there and back on 3 tires and a Shinn Fu floor jack....I'm good.
     
  7. Tbaker

    Tbaker New Member

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  8. Tbaker

    Tbaker New Member

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    Lane I saw a post you had written about the little elbow hose sitting up against the firewall at the back of the motor. It connects the metal PCV hose to a sensor of some sort. Well you were spot on. I couldn't resolve my Check Engine light so I bought the part number you supplied through Galpin Ford in Los Angeles. I was able to pry off the old hose with long nose pliers and a screwdriver and sure enough I had a hole right inside the actual curve of the elbow. Now my problem began there. I could not get the new elbow back onto the part that sits on the manifold. You have to reach far far back with left arm only. I even tried adding some oil to the hose which then made it slippery and I dropped it into the area of no mans land on top of the block. I could not retrieve it so bought the same part again this morning. Do you have any advice for actually getting the new hose back on?

    Thanks in Advance
     
  9. 1955moose

    1955moose Full Access Members

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    Shinn fu, I went to school with his Asian brother Jim Shoe. He was great at sports!

    Sent from my N9131 using Tapatalk
     

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