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Ford f250 460 code p0172

Code P0171 and P0172. truck run rough and stalls. also dies when you come to a stop. it is getting about 4 mpg, whats goin on with this thing?

Posted by Jim Huffman on

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Thomas Perkins

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Here's code P0172.here's code P0171.

Posted on Apr 07, 2013

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3 Related Answers

csmock132

Clint Smock

  • 4669 Answers

SOURCE: check engine light on,running rough code P0172

When I see all these codes i instantly think of two things. Vacuum leak especially intake manifold gaskets and Mass air flow sensors. Spray the engine with carb cleaner when its running and see if you get it to rev up,run rough or run different. Next unplug the MAF and drive the car, see if it runs normal.

Posted on Jun 02, 2009

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Steve S

  • 984 Answers

SOURCE: my truck is v6 4.2l and have 2 codes p0171 and

Have you cleaned the MAFS ( Mass Air Flow Sensor ) which is in the intake by the air filter ( little tower with hole in it ).
Usually the lean conditions are reported due to un-metered air in the system which could be the MAFS not keeping track correctly due to it being dirty.
The other problem could be cracked vacuum lines, usually the one to the back of the throttle body ( under the plastic cover ). This is another way for unmetered air getting into the system.

Start with cleaning the MAFS ( with MAFS safe throttle body cleaner, the can will specifically state MAFS safe, don't assume ), after putting it back together ( making sure the tubing is together from the MAFS to the throttle body ) disconnect the battery for 10 min, reconnect and take for a drive, varying the throttle from 30 MPH up to 48 MPH for 2 cycles, to make sure all the system tests have completed.
If you get the CEL light again, start with checking the vacuum lines ( old enough truck, might need to be replaced ).
Could be other things, but these are the most common ones.

Posted on Jan 11, 2010

Anonymous

  • 407 Answers

SOURCE: check engine light on,running rough and stalling.

means you have multiple misfires (po300) the other codes are lean codes, possiable tune up , bad injector, fuel pump,

Posted on May 07, 2009

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Try starting the car and wiggling the connector for the MAF sensor. Also try tapping the MAF sensor. If the idle changes or the car stalls replace the MAF sensor.

The second shop should recognize that these codes don't have anything to do with the ignition module.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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