Question about Chrysler Town & Country

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Plug wires were arching,replaced plugs and wires,there has been low cat efficentcy codes ,but ran good,have code p0172(rich).checked,tp sensor checked evap purge valve checks good per alldata.Exhast does not feel restricted

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  • ern61156 Jun 27, 2009

    I cleaned it still runs shitty,with scanner it reads(voltage)4.6 koeo,2.7 at idle.The baro pid 100 kpa all the time .The bottom of the sensor is it suppose to be flat,or is ther a hole?

  • ern61156 Jun 27, 2009

    I turn it over and can see the copper strip in the bottom of the hole,the car will not start when unplugged.dies when you unplug it,

  • ern61156 Jun 30, 2009

    Well,I put a new map sensor on(loaded with oil),still ran rich.car has 122,000,miles so I dropped exhaust down still the same,wires all good,ran all tests per alldata 3 times all checked out ok.The problem was the egr valve was just a tad open causing the rich condition,my snap-on solis had no pid to monitor the egr and no alldata tests for the code even touched on the egr.I had this same problem in 1984 on a Ford tempo that was dumping fuel.Thanks for the help put this one in your book.

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There is something you can do if indeed the mixtrue is rich. Try introducing a leak in the intake, this will cause a slightly leaner mixture to the engine. Reset the code, and do a drive cylce. If the code comes back as being rich then, it is the 02 sensor that needs replacing. Since 02 sensor are expensive, you can confirm by monitoring its fluctuation. A healthy sensor would have a higher valley of fluctuation and close together. A "lazy' sensor is just the opposite. Also check the fuel pressure regulator, since that can cause rich mixture as well. Dirty injectors can also cause a rich mixture. An overly advance timing can cause a rich mixture reading as well because it lowers the operating temp of the catalytic converter. A dirty air filter can cause a rich mixture. A faulty CTS( coolant temperature sensor) can cause a rich mixture, for example by sending a high resistance reading to the computer therefore resulting in adjusting the Pulse to the injector as if the engine was cold.

Posted on Jun 30, 2009

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Clean the maf sensor on the intake

Posted on Jun 27, 2009

  • gerald darling
    gerald darling Jun 27, 2009

    it should be sealed

  • gerald darling
    gerald darling Jun 27, 2009

    recheck plug wire locations, even the best mechanics can make that error

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What code is it giving ? p0172 system too rich bank 1 ? If it is staying around 0.8 millivolts try introducing a vacuum leak an see if it goes lean ! If it does it is working fine . You probably have leaking fuel injectors or a fault fuel pressure regulator ! You need a better scan tool to check fuel trims , short term am long term ,to see if the computer is adding or subtracting fuel ! Oxygen Sensor Test fixed rich signal Ford O2 Sensor Testing

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It's probably not the throttle position sensor, but rather the wiring that goes to the sensor. Also your plugs or plug should not be black unless it is oil fouled or carbon fouled. Carbon fouled would indicate an over rich mixture problem. Wet and black would indicate oil fouling. You need to check the oxygen sensor also. A false indication from it would could cause a rich fuel condition. Start with the wiring to the TPS switch. Last but not least check your map sensor and the vacuum hose running to it. All these items contribute to the overall fuel delivery system and how it functions.

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