Sort of OT - short easy quiz P0171 & P0174
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From: FatterDumber& Happier Moe on 18 Jan 2010 19:26 Ray O wrote: > A friend recently contacted me to ask about a check engine light on their > 2000 Windstar with 105,000 miles and to ask why the engine idles poorly and > acts like it is going to stall unless the transmission is in neutral and the > driver blips the throttle. Service history - replaced fuel pump 3 years ago > for a no-start condition; replaced spark plugs at 60 K miles with cheap > aftermarket spark plugs; oil changes once or twice a year at 5,000 mile > intervals; uses about 1 quart of oil per 1,000 miles, often run 2 or 3 > quarts low on oil because oil gets checked > > I plugged in my handy dandy OBD II scanner and found P0171 - system too lean > Bank 1 and P0174 - system too lean Bank 2. I know the cause, and for this > exercise, I ask that the pros like aaracuda and claire@... NOT respond with > the correct answer because I'm curious to see what the shade tree folks here > come up with. Of course, the pros are welcome to respond with an > explanation why a particular answer is correct or incorrect, IOW, serve as a > teacher and not as a student. > > Here is the quiz part: What is the likely cause of P0171 and P0174? Like > school quizzes, respondents have to explain why their answer is a likely > cause. > I'd google it and read what I read and probably start with cleaning the MAF sensor, check for vacuum leaks and keep going until I found what caused the lean condition, maybe replace the EGR pressure difference sensor? and reprogram the PCM. http://www.aa1car.com/library/ford_lean_codes.htm If that didn't fix it, I'd google some more and look at some ford forums to see what others have had to do for repairs. And put a fram oil filter on it.......
From: Ray O on 18 Jan 2010 19:28 "aarcuda69062" <nonelson(a)sbcglobal.net> wrote in message news:nonelson-1EB9BC.18043718012010(a)news.eternal-september.org... > In article <hj2hlm$bhc$1(a)news.eternal-september.org>, > "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote: > >> A friend recently contacted me to ask about a check engine light on their >> 2000 Windstar with 105,000 miles and to ask why the engine idles poorly >> and >> acts like it is going to stall unless the transmission is in neutral and >> the >> driver blips the throttle. Service history - replaced fuel pump 3 years >> ago >> for a no-start condition; replaced spark plugs at 60 K miles with cheap >> aftermarket spark plugs; oil changes once or twice a year at 5,000 mile >> intervals; uses about 1 quart of oil per 1,000 miles, often run 2 or 3 >> quarts low on oil because oil gets checked >> >> I plugged in my handy dandy OBD II scanner and found P0171 - system too >> lean >> Bank 1 and P0174 - system too lean Bank 2. I know the cause, and for >> this >> exercise, I ask that the pros like aaracuda and claire@... NOT respond >> with >> the correct answer because I'm curious to see what the shade tree folks >> here >> come up with. Of course, the pros are welcome to respond with an >> explanation why a particular answer is correct or incorrect, IOW, serve >> as a >> teacher and not as a student. >> >> Here is the quiz part: What is the likely cause of P0171 and P0174? >> Like >> school quizzes, respondents have to explain why their answer is a likely >> cause. > > Awww Ray....! No easy ones for you buddy! -- Ray O (correct punctuation to reply)
From: Ray O on 18 Jan 2010 22:50 "SMS" <scharf.steven(a)geemail.com> wrote in message news:4b54f9d1$0$1674$742ec2ed(a)news.sonic.net... > Ray O wrote: > >> Here is the quiz part: What is the likely cause of P0171 and P0174? >> Like school quizzes, respondents have to explain why their answer is a >> likely cause. > > A problem with the Mass Airflow Sensor. Either the sensor is working but > there's a vacuum leak, or the sensor is dirty. > What is your reasoning for naming the MAF sensor? -- Ray O (correct punctuation to reply)
From: Ray O on 19 Jan 2010 00:51 "FatterDumber& Happier Moe" <"WheresMyCheck"@UncleSamLoves.Mee> wrote in message news:4b54fc2b$0$12428$bbae4d71(a)news.suddenlink.net... > Ray O wrote: >> A friend recently contacted me to ask about a check engine light on their >> 2000 Windstar with 105,000 miles and to ask why the engine idles poorly >> and acts like it is going to stall unless the transmission is in neutral >> and the driver blips the throttle. Service history - replaced fuel pump >> 3 years ago for a no-start condition; replaced spark plugs at 60 K miles >> with cheap aftermarket spark plugs; oil changes once or twice a year at >> 5,000 mile intervals; uses about 1 quart of oil per 1,000 miles, often >> run 2 or 3 quarts low on oil because oil gets checked >> >> I plugged in my handy dandy OBD II scanner and found P0171 - system too >> lean Bank 1 and P0174 - system too lean Bank 2. I know the cause, and >> for this exercise, I ask that the pros like aaracuda and claire@... NOT >> respond with the correct answer because I'm curious to see what the shade >> tree folks here come up with. Of course, the pros are welcome to respond >> with an explanation why a particular answer is correct or incorrect, IOW, >> serve as a teacher and not as a student. >> >> Here is the quiz part: What is the likely cause of P0171 and P0174? >> Like school quizzes, respondents have to explain why their answer is a >> likely cause. >> > > I'd google it and read what I read and probably start with cleaning the > MAF sensor, check for vacuum leaks and keep going until I found what > caused the lean condition, maybe replace the EGR pressure difference > sensor? and reprogram the PCM. > http://www.aa1car.com/library/ford_lean_codes.htm > If that didn't fix it, I'd google some more and look at some ford forums > to see what others have had to do for repairs. > And put a fram oil filter on it....... OK, not a bad approach to problem solving. The web site listed pretty generic information on what could cause a lean condition without really narrowing down the possibilities, which is what I do when I don't have much information to go on. In this case, however, I listed clues that could help you narrow down the possibilities that were listed on that site. -- Ray O (correct punctuation to reply)
From: C. E. White on 19 Jan 2010 14:07 "Hachiroku" <Trueno(a)e86.GTS> wrote in message news:hj4u31$v1d$2(a)news.eternal-september.org... >> The codes you listed. I had a similar situation with one of my >> vehicles >> and it came down to the intake manifold. Lean mixture and one side >> was >> leaking. > > Aw, c'mon! A Ford 3.8 with a leaking manifold gasket?!?! Better than a 3.8L with a blown head gasket! Ed
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