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Code po172 system too rich

The car is hard to start after it starts then its easy to restart then I get a code system too rich

Posted by Anonymous on

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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tommyboinow
  • 324 Answers

SOURCE: 2004 chevy trailblazer bogging out

Po codes are a default, reset the computer by removing the battery cable for 10 mins.

this will reset the comp back to 0's.

Posted on Nov 26, 2008

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bigdemille
  • 15 Answers

SOURCE: engine will start just fine ,But engine is running

you need to ajust rebuild or get a new carb is what it sounds like to me

Posted on Jun 08, 2009

  • 400 Answers

SOURCE: engine misfire code multiple cylinders, starts

There are quite a few things that can cause this.
Check your fuel pressure to start. 55 psi key on is good.
Also make sure it dosen't fall back down should hold at that psi with out engine running.
Aslo the intake's like to leak air around the gaskits which will cause a miss fire.
Aslo the mass air flow.

Posted on Jun 22, 2009

ZJLimited
  • 17970 Answers

SOURCE: 2009 Chevy Aveo with computer

A code P0172 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak.
* There could be a fuel pressure or delivery problem


Some possible solutions include:
* Inspect all vacuum and PCV hoses, replace if necessary
* Cleanthe MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect fuel lines for cracks, leaks, or pinches
* Check the fuel pressure at the fuel rail
* Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
* Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)


Hope helps.

Posted on Apr 29, 2011

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po-120 is--tps/pedal position sensor A curcuit malfunction. po172 is---system to rich (bank 1). po120 means that the tps is out of adjustment or it is bad. for po172 after you repair tps, it may be ok, if not change front oxygen sensor,

Apr 09, 2009 | 1998 Chevrolet Malibu

1 Answer

1996 es300 trouble code po172 and misfireing on all cylinders


Whats going on here is that you have a too rich fuel air mixture. This will cause your misfiring and set off the PO172 Code. Your Bank 1 O2 Sensor is picking up the too rich mixture. This O2 sensor is location on the #1 Cylinder side (so you problem could be in #1/#3/#5 Cylinder). A dirty MAF Sensor, loose plug wire, dirty/broken spark plug, dirty fuel injectors, vacuum leak, and PCV Valve could all be a cause. I would run some injector cleaner through and also clean the MAF Sensor, change your PCV Valve. This would be an easy and cheap start for you. Good luck and thanks for using FixYa!

Sincerely,
JC

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