p0171 | Ford Explorer - Ford Ranger Forums - Serious Explorations

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  1. R

    Solved Help needed for identifying a vacuum hose on the throtte body.

    Howdy! I have a 2000 Ford Explorer Sport. Currently, it has a check engine light for P0171 and P0174, stating that it's running lean. I used a smoke tester and found a substantial leak-- one of the hoses is ripped apart. While running, moving the hose causes the idle to fluctuate, and a lot of...
  2. E


    Victorville, CA..........Hi Listed my short horror story in Profile. :help::help::help::help:
  3. T

    Lean condition - only shows P0171 code

    Howdy, I'm fighting a lean code on my 2001 explorer xlt 4.0L v6 SOHC. The reader only shows p0171. I've cleaned the MAF sensor 3 times so far and changed the air filter. I had a K&N in there and I read the oil on them can keep mucking with the MAF. Now it's got a paper STP filter in it. After I...
  4. Y

    bank 1 and 2 lean codes fix?

    hey guys so i just picked up a 1998 ford explorer sport (2 door v6) 88k miles magically the CEL came on after 250 miles of driving (i know i should have checked to see if it was reset) codes were P0171 and P0174. -I ran some injector cleaner thru and dry gas as well, reset and light came back...
  5. D

    AT WITS END WITH P0171 (Check Engine Light System Too Lean)

    First, the two middle vents do not blow hot air as strong as the defrost vents do. Even the rear vents to the back seat blow strong and healthy. This leads me to believe from what I read here that I must have a vacuum leak. I have checked every possible hose and replaced both upper and lower...
  6. J

    Trying to track down lean codes (P0171, P0174)

    I have been getting the lean codes for Bank 1 and Bank 2. I clean and replaced MAF. I had previously replaced the famous vacuum elbow (and it's still good). I have had a smoke test done to find any other vacuum leaks. A small amount of smoke came from the EGR, replaced it. The codes have...
  7. J

    Help code p0171

    My Explorer starts and drives fine until temp then dies the o2 sensor by the cat (upstream) is greasy and old looking and my egr looks like it's missing a hose please help....!
  8. C

    Please help! 2002 Ford Explorer 4.0 SOHC

    My 2002 explorer has a terrible rough idle and clanking sound. After its running a minute or 2 the RPM's level out just under 1000 but the clanking sound is still there. I'm getting lean codes p0171 and p0174 as well as misfire codes in all 6 cylinders. I've checked for vacuum leaks with carb...
  9. A

    P0171 and p0446 codes

    My 97 explorer is showing both the P0171 and P0446 codes. I know what the codes are but, I was wondering if the fact that they are both showing means they're related. And if so, what would be the recommended repair to start with?
  10. F

    P0171 and P0174

    HELP!!!! I have a 2000 Explorer Eddie Bauer with 133k and every 2,000 or so miles it throws the infamous P0171 and P0174 codes. It never stalls but at idle in gear it feels like it has a vibration in the engine. If you let it idle in park long enough the rpms will drop down and come back up...
  11. P

    Another Lean Code Mystery: P0171 & P0174

    I'm hoping that I won't get blasted for this since it's been gone over many times, but I'm having trouble with diagnosing P0171 and P0174 codes. The first thing I did of course was reset the codes. The CEL stayed off for a few days then came right back with the same codes... I'm not really...
  12. M

    Need some help replacing Plenum gasket

    I don't know how to search these forums as well as most of you, and I need some help. I took my 97 SOHC to a mechanic, and he said that I needed to replace the plenum gasket and my MAF sensor. I haven't been able to pass smog because of P0171 and P0174. I finally just took it in to have them...
  13. H

    97 Explorer V6 4.0 p0171 & p0174 HELP!

    So on my 97 Explorer i keep getting codes for banks 1 & 2 too lean. I have tried searching for vacuum leaks with a smoke machine and found nothing. I changed the fuel filter and no change. I hooked up a scan tool with live data and saw my fuel trims were all at -100 and all 3 o2 sensors...
  14. M

    Post valve cover repair codes

    I recently repaired the valve cover gaskets. I got it all back together and .... P0201 - Fuel injector circuit condition - #1 P0205 - Fuel injector circuit condition - #5 P0171 - Fuel trim bank 1 / Bank 1 lean (probably a child code related to above) Has anyone seen this issue before? I...
  15. A

    "tree diagram" for p0171 and p0174

    anybody have a "tree diagram" out of a service manual for the p0171 and the p0174???? i have bad cold idling problems. i checked all the vacume houses and sprayed carb cleaner on everything including the manifold.....a tree diagram would be awesome
  16. A

    Got the bad news... Help please

    So I took my 96 EB into the dealership to get it checked so I can figure out what it was and stop the guess work. The car wouldn't start so I had to tow it in. It didn't start for them either and they pushed it into the garage. Anyway here are the codes they pulled. P0171 (Bank 1 Lean)...