Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Go Back   Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > >
Forgot Password? Join Us!

Welcome to Ford Ranger Forum

Reply
 
Thread Tools Search this Thread

  #1  
Old 01-30-2011, 03:11 PM
range0rover range0rover is offline
Liking the Ford Ranger Forum
 
Join Date: Nov 2010
Posts: 20
Default P0171.....vacuum leaks and What is this??

I have been searching for a vacuum leak that would give me a P0171(PO171) code on my 2000 2.5 man Ranger. Have traced many hoses/tubes but no leaks. The pic shows a part that has a couple of vacuum hoses attached to it that I am suspicious of - the round top just turns and doesnt seem to be attached to anything. Does anyone know what this is or if the top should be spinning like that?

Also, I thought I would present the FF data that the computer saved at time of code, hoping that someone would be able to help me narrow my search. Here tis:

Fuel Sys 1 - CL
Fuel Sys 2 - NA
Calc Load(%) - 91.8
ECT (oC) - 87
STFT B1(%) - 14.1
LTFT B1(%) - 25.0
Eng RPM - 1261
Veh Speed (km/h) - 0

Of course, my problem may not be a vac leak. But hopefully someone will see something that will give a clue about what's going on.

your help would be appreciated. thx
Attached Images
File Type: jpg evap.jpg (97.6 KB, 132 views)
__________________
2000 Ranger XLT, Ext Cab, 4x2, 2.5L 4 cyl, 5spd man

no modifications

Last edited by range0rover; 01-30-2011 at 04:21 PM. Reason: add pic
Reply With Quote
  #2  
Old 01-30-2011, 05:10 PM
DeckedOut DeckedOut is offline
Liquir up Front, Poker in
 
Join Date: Oct 2010
Posts: 232
Default Re: P0171.....looking for vacuum leak

When you say you traced, did you inspect hoses to ensure there arent any split? That seems to be a common reason on these trucks.
__________________
2003 Ford Ranger Regular Cab 2WD
Modified Air Intake , 17 Inch Wheels , Custom Interior, Custom Ford Emblems, Black Headlight Covers, Tinted Euro Tailights, Tinted Third Brake Light, Purple Underglow, Engine Dress Up (In progress), Air Box Mod Sony XPLod Subs/Amps, Aux Lights, Hand Made Grille Inserts, Playing Card Vinyl, LineX Bed Liner, Some undercoating (in progress), Dual Exhaust
Reply With Quote
  #3  
Old 01-30-2011, 05:24 PM
FireRanger FireRanger is offline
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Re: P0171.....looking for vacuum leak

If you have P0171 or P0174, then it's 99.9% chance a vacuum leak. You just haven't found it yet. You can spray ether on the vacuum lines to help find it. When it hits the leak, it will suck it in and you'll hear the idle go up.
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #4  
Old 01-30-2011, 05:31 PM
DeckedOut DeckedOut is offline
Liquir up Front, Poker in
 
Join Date: Oct 2010
Posts: 232
Default Re: P0171.....looking for vacuum leak

carb cleaner should also do the trick
__________________
2003 Ford Ranger Regular Cab 2WD
Modified Air Intake , 17 Inch Wheels , Custom Interior, Custom Ford Emblems, Black Headlight Covers, Tinted Euro Tailights, Tinted Third Brake Light, Purple Underglow, Engine Dress Up (In progress), Air Box Mod Sony XPLod Subs/Amps, Aux Lights, Hand Made Grille Inserts, Playing Card Vinyl, LineX Bed Liner, Some undercoating (in progress), Dual Exhaust
Reply With Quote
  #5  
Old 01-31-2011, 11:47 PM
range0rover range0rover is offline
Liking the Ford Ranger Forum
 
Join Date: Nov 2010
Posts: 20
Default Re: P0171.....looking for vacuum leak

DeckedOut - I took the hoses loose at both ends and put the 'ole country vacuum on them (put finger on one end and sucked on the other). Only found one that made noise or didnt hold the vacuum. replaced that small plastic line and cleared the code but it came back again.......

havent tried ether or spray cleaner yet. I'll wait until this weekend when it isnt -15 outside :-) thx
__________________
2000 Ranger XLT, Ext Cab, 4x2, 2.5L 4 cyl, 5spd man

no modifications

Last edited by range0rover; 02-04-2011 at 11:49 PM.
Reply With Quote
  #6  
Old 02-01-2011, 02:50 AM
modelageek modelageek is offline
Ford Ranger Driver
 
Join Date: Jan 2009
Posts: 6,257
Default Re: P0171.....vacuum leaks and What is this??

Quote:
Originally Posted by range0rover View Post
I have been searching for a vacuum leak that would give me a P0171(PO171) code on my 2000 2.5 man Ranger. Have traced many hoses/tubes but no leaks. The pic shows a part that has a couple of vacuum hoses attached to it that I am suspicious of - the round top just turns and doesnt seem to be attached to anything. Does anyone know what this is or if the top should be spinning like that?

Also, I thought I would present the FF data that the computer saved at time of code, hoping that someone would be able to help me narrow my search. Here tis:

Fuel Sys 1 - CL
Fuel Sys 2 - NA
Calc Load(%) - 91.8
ECT (oC) - 87
STFT B1(%) - 14.1
LTFT B1(%) - 25.0
Eng RPM - 1261
Veh Speed (km/h) - 0

Of course, my problem may not be a vac leak. But hopefully someone will see something that will give a clue about what's going on.

your help would be appreciated. thx
the part is the Vapor Canister Purge Solenoid. I think it is possible to be the cause of the p0171. I am not sure if the top should spin. do you have any other symptoms, is there anything else that is not working? is your heater control working? test your vacuum if you can you should have around 19

possible causes, vacuum line, air intake, pcv, clean maf, fuel pressure, injectors, hole in egr tube, bad dpfe..........run some Techron in the tank
__________________
2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

Last edited by modelageek; 02-01-2011 at 02:59 AM.
Reply With Quote
  #7  
Old 02-01-2011, 05:47 AM
1KOOL1 1KOOL1 is offline
Like the Forums
 
Join Date: Jan 2011
Posts: 33
Cool Re: P0171.....looking for vacuum leak

http://www.therangerstation.com/tech...igitcodes.html someone may need this also if they don't know what all those codes were. may want to keep this as a reference. I know this isn't the answer you were looking for but you might need it later. You might search through this & find something that may help you. Look closely at the air intake hose. ALSO AS INFO LOOK AT THE TECH LIBRARY SECTION.
__________________
2011 mustang/66 mustang//not bad ass, but bad enough.

Last edited by 1KOOL1; 02-01-2011 at 07:40 AM.
Reply With Quote
  #8  
Old 02-01-2011, 06:27 AM
1KOOL1 1KOOL1 is offline
Like the Forums
 
Join Date: Jan 2011
Posts: 33
Cool Re: P0171.....looking for vacuum leak

A po174 lean code, is a code for for bank 2. (the left) drivers side of the engine on a ford vehicle with a transverse mounted v-6 engine & front wheel drive. This code will not set on a 4 cylinder engine. (no bank #2). as info. But, also as info, they in reality still mean the same thing but only if you have another engine type set-up. Just saying, you won't have an engine code po174 show up.
__________________
2011 mustang/66 mustang//not bad ass, but bad enough.

Last edited by 1KOOL1; 02-01-2011 at 07:38 AM.
Reply With Quote
  #9  
Old 02-01-2011, 06:55 AM
modelageek modelageek is offline
Ford Ranger Driver
 
Join Date: Jan 2009
Posts: 6,257
Default Re: P0171.....looking for vacuum leak

Quote:
Originally Posted by 1KOOL1 View Post
http://www.therangerstation.com/tech...igitcodes.html someone may need this also if they don't know what all those codes were. may want to keep this as a reference. I know this isn't the answer you were looking for but you might need it later. You might search through this & find something that may help you. Look closely at the air intake hose.
just so no one gets confused ......those codes are for the OBD-I system.....the OP has an OBD-II system
__________________
2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
Reply With Quote
  #10  
Old 02-01-2011, 07:21 AM
1KOOL1 1KOOL1 is offline
Like the Forums
 
Join Date: Jan 2011
Posts: 33
Cool Re: P0171.....looking for vacuum leak

he's the one that said he had a 3 digit code. http://www.obd-codes.com/trouble_codes/ford/ here try this. Alot of info. Save it!!! Also look at the page for the obd generic codes//lots of info here.
__________________
2011 mustang/66 mustang//not bad ass, but bad enough.

Last edited by 1KOOL1; 02-01-2011 at 07:23 AM.
Reply With Quote
  #11  
Old 02-27-2011, 11:23 PM
range0rover range0rover is offline
Liking the Ford Ranger Forum
 
Join Date: Nov 2010
Posts: 20
Default Re: P0171.....looking for vacuum leak

Since I don’t drive my Ranger that much I have been looking for a cause for by P0171 code only sporadically over the past couple of months. Knowing that vac leaks are a main cause I have checked pressure on every hose & tube I can find. Found 2 leaks in small hoses, fixed but still have the code after resets. Also sprayed a lot of starting fluid but no hint of leaks.

So then I started checking other things. Checked DPFE – no fix, reset CEL. I am at 89,350 so I replaced PCV & air filter – no fix, reset CEL. Then I replaced plugs & fuel filter – no fix, reset CEL.

When I replaced the fuel filter I tried to release fuel pressure by pressing the Schrader valve on the fuel rail but had no pressure at all (truck had been off about 30 mins). My repair manual indicates that common causes for P0171 are fuel system/pressure/injector problems. I haven’t noticed any starting problems but I have noticed a faint smell of gas when exiting the truck after parking through the drivers door, which happens to be next to gas tank/filler.

So my question is three fold: 1) isn’t the fuel system always supposed to have pressure, and 2) since mine didn’t have any, could this be the symptom of a leak and worthwhile to chase?, and if so, 3) any suggestions on what sequence of fuel system parts to check?

Here are some FF data if it helps....

..........................25-Jan....5-Feb.....19-Feb...21-Feb....26-Feb
Fuel Sys 1............CL..........CL.........CL..........CL ..........CL
Fuel Sys 2............NA.........NA..........NA.........NA. ........NA
Calc Load %..........60.........46.7.......29.8.......71.4.. .....27.5
ECT (oC)..............88..........92.........88....... ...75.........78
STFT B1 (%).........14.1.......14.1.......-1.6.......15.6.......26.6
LTFT B1 (%).........17.2.......14.1.......10.9.......25... .......3.9
Eng RPM...............2473......1135.......2422......2 289......1663
Veh Spd (kph).......54..........6...........94..........46 .........21


Thanks in advance for any suggestions.....
__________________
2000 Ranger XLT, Ext Cab, 4x2, 2.5L 4 cyl, 5spd man

no modifications

Last edited by range0rover; 02-27-2011 at 11:31 PM.
Reply With Quote
  #12  
Old 02-28-2011, 01:43 AM
S13minus1 S13minus1 is offline
Sideways? Sideways.
 
Join Date: Jun 2010
Posts: 1,592
Send a message via AIM to S13minus1
Default Re: P0171.....looking for vacuum leak

residual pressure is only for startup, you'll want to check pressure and flow while running for best results. the fuel system will never really ALWAYS have pressure. even though that would be ideal. no, chasing a fuel leak will not be ideal. being obdII, your fuel system is monitored for leaks by the computer, and if there is a leak, there will be a code present. does your 2.5l have a mass air flow meter? id check to make sure its clean, possibly hit it with some cnc maf cleaner. also, check fuel pressure and flow while running. also, check for exhaust leaks before the 02 sensor. this can cause a false lean condition.
__________________
-Alex
'10 Ranger XL 2.3L Manual
Mods: Stereo, Tint, Weatherguard rain shields, Intake silencer removal, LED brake, turn signal, reverse, license plate, and dome lights, DDM HID's (currently removed), lowered, 17" wheels with spacers, Explorer autodim mirror with Autolamps, Magnaflow exhaust, Buggman LED 3rd Brake Light...
Quote:
Originally Posted by ColinS View Post
awe come on alex be a man!
Reply With Quote
  #13  
Old 03-01-2011, 06:29 PM
range0rover range0rover is offline
Liking the Ford Ranger Forum
 
Join Date: Nov 2010
Posts: 20
Default Re: P0171.....looking for vacuum leak

yep, already cleaned the MAF. will check fuel pressure soon, when I can find a gauge. dont notice any exhaust leaks on the front side of the catalyst.
__________________
2000 Ranger XLT, Ext Cab, 4x2, 2.5L 4 cyl, 5spd man

no modifications
Reply With Quote
  #14  
Old 08-06-2011, 08:28 AM
range0rover range0rover is offline
Liking the Ford Ranger Forum
 
Join Date: Nov 2010
Posts: 20
Default Re: P0171.....looking for vacuum leak

I finally got closure on this back in May but forgot to post it.

Broke the problem down and searched it out like this.....

Running lean (P0171) is caused by either a) too much air, or b) too little fuel, or c) sensor issues.

So I did my searching from easiest/cheapest first then to more complicated/expensive.....

- First I made sure all maintenance/tuneup stuff was up to date.
- Then I searched for vacuum leaks (too much air) but didnt find any.
- Then I got a pressure gauge and checked the fuel pressure on the rail (too little fuel). Bingo! There was only 30 lbs and it should have been 64 +/-8. So I did 3 things in this order 1) tested the fuel damper, it was OK, 2) tested the voltage at the fuel pump, it was OK, so that meant that the fuel pump was bad, 3) so I replaced it.

After replacing the pump the truck runs near perfect, and has for 3 months.

By the way, I removed the bed to get to the pump. There are only 6 bolts, two filler neck hoses, and one electric wire plug to mess with. And with 6 mins of help from my trusty neighbor (3 to move the bed to the yard and and hour later, 3 more mins to put it back on) the process was pretty easy!
__________________
2000 Ranger XLT, Ext Cab, 4x2, 2.5L 4 cyl, 5spd man

no modifications
Reply With Quote
  #15  
Old 04-09-2012, 06:11 PM
upchucker upchucker is offline
Learning to use the forums
 
Join Date: Apr 2012
Posts: 1
Default Re: P0171.....looking for vacuum leak

just wondering, how did you check the fuel pressure? and you say that your pressure was about 30 PSI, so what was wrong? you're pump was pumping but not to full capacity?
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
2003 Ranger vacuum leak customlegend 4.0 SOHC / 4.0 OHV Tech 28 10-03-2013 06:31 PM
Replaced fuel pump - now have evap leak - slow leak detected drewglenn04 4.0 SOHC / 4.0 OHV Tech 0 11-04-2010 08:48 PM
vacuum leak big green 4.0 SOHC / 4.0 OHV Tech 7 01-16-2010 09:36 AM
Vacuum leak help Mike 4-Cylinder Tech 2 09-10-2009 07:24 AM
How can i find a vacuum leak at my gas tank,ford ranger? JoJo General Ford Ranger Discussion 1 01-12-2009 02:41 PM