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  #1  
Old 04-25-2012, 03:06 PM
Barga_B
 
Join Date: Apr 2012
Posts: 6
Exclamation P0172 & P0175 Please HELP!!!

My truck is driving my crazy! I've been trying to figure out what is wrong with my truck. It has a rough idle. Pulsates between 500RPM and 1500RPM when started cold. Its goes up and down for about a minute before the RPMs level out. Sometimes it just dies. Sometimes after driving for a while and i throw it into neutral to began to slow down, the RPM's stay up around 2500 for about 5 seconds after i've came to a complete stop. So far within the past year I've been replacing parts here and there, they include:
-ignition coil
-plugs & wires
-starter
-fuel pump
-fule filter
-MAF sensor
-O2 sensor L & R
-Air Filter
-Fuel injectors
-Coolant/air temp sensor
-Throttle position sensor ordered but not installed

Please help me figure this out. I've thought maybe it is a gasket or maybe I did something wrong while installing the fuel injectors, I just don't know and I want to stop wait sting money!
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  #2  
Old 04-25-2012, 03:41 PM
OIF Veteran

 
Join Date: Feb 2010
Posts: 6,042
Default Re: P0172 & P0175 Please HELP!!!

Did you read the sticky at the top of this section? May have the answer to your problem.

If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!
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http://www.cardomain.com/ride/2321189

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  #3  
Old 04-25-2012, 04:34 PM
FX4 MADNESS.
 
Join Date: Jan 2011
Posts: 4,604
Default Re: P0172 & P0175 Please HELP!!!

If that ^^ doesn't fix it try checking your alternator. Mine did EVERYTHING and i mean everything you stated when my alternator started to die.
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  #4  
Old 04-25-2012, 05:31 PM
Ford Motor Co
 
Join Date: Sep 2011
Posts: 171
Default Re: P0172 & P0175 Please HELP!!!

intake plenum gaskets solved my idling/dying problem when my ranger did this
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1996 Ford Ranger XLT 245 4.0L OHV V6 4X4 Supercab-Flowmaster Super 10 Series W/ 2.5" Piping And 3.5" Tips-15x10 Eagle Alloy Rims W/ 31/10.50R15 Nexen Roadian M/T Tires-Summit Racing 3" Body Lift-Rough Country 4" Suspension Lift-Rough Country 8000 Series Hydro Shocks-Roll Bar-Bedlined Grill/Fender Flares
1990 Ford Ranger Custom 177 2.9L OHV V6 4X4-Trail Rig-Removed Bed-Removed Sway Bars-Front Fenders Pushed In-Black Painted Steel Rims W/ P235/75R15 Goodyear Wrangler A/T Tires
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  #5  
Old 04-29-2012, 06:40 PM
Barga_B
 
Join Date: Apr 2012
Posts: 6
Default Re: P0172 & P0175 Please HELP!!!

Thanks a lot! Ill replace the intake gasket. It's fairly inexpensive anyways. Not really sure how to "check" the alternator, but ill look it up at the University of YouTube! ha
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  #6  
Old 04-29-2012, 06:43 PM
Ford Tough
 
Join Date: May 2009
Posts: 464
Default Re: P0172 & P0175 Please HELP!!!

Just pull the alternator and have it tested, it needs to come off anyway to swap gaskets. The auto parts stores will test it for free.
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  #7  
Old 05-21-2012, 07:34 PM
Barga_B
 
Join Date: Apr 2012
Posts: 6
Default Re: P0172 & P0175 Please HELP!!!

Ok! Well I fixed the problem. I went to O'reileys and got a print out of the two codes. At the bottom it gave me what the problems might be. Some of them were only if P0172 & P0175 were present together: engine coolant thermostat, PCM ground wiring, Fule pressure regulator, Fuel Rail/Pressure Damper, & MAF sensor. I narrowed it down to two. The PCM ground wiring or the fuel rail damper. It turned out to be the Damper. I was having trouble with starting every once in a blue moon. After a year it began to get a lot worse. I replaced the starter, fuel pump, plugs wires, ignition coil, throttle sensor, IAC valve, coolant temp sensor, fuel filter, and the fuel injectors. It all came down to the Fuel Rail pressure damper!!!!! Heads up fellas!
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  #8  
Old 06-05-2012, 09:05 PM
Barga_B
 
Join Date: Apr 2012
Posts: 6
Default Re: P0172 & P0175 Please HELP!!!

Ok well I thought i fixed the problem but I didn't. I have to pump my gas peddle a few times before i start up the truck. Got the alternator tested and the battery all ready Good. Any more ideas?
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  #9  
Old 06-05-2012, 10:11 PM
Ford Motor Co
 
Join Date: Jan 2012
Posts: 157
Default

Quote:
Originally Posted by Caseywoods5
intake plenum gaskets solved my idling/dying problem when my ranger did this
Solved my problems at a 180,xxx
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  #10  
Old 06-06-2012, 04:02 PM
A Damn Proud Maritimer
 
Join Date: Nov 2010
Posts: 743
Default Re: P0172 & P0175 Please HELP!!!

Quote:
Originally Posted by chadbarga View Post
Ok well I thought i fixed the problem but I didn't. I have to pump my gas peddle a few times before i start up the truck. Got the alternator tested and the battery all ready Good. Any more ideas?
This should have no effect on a fuel injected vehicle. The reason you did this on a carburated vehicle was to prime the engine with the carburators accerator pump and set the choke, fuel injection does use these features.
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