1996 Chrysler Cirrus GAS BURNER

Tiny
TRACKMASTER9
  • MEMBER
  • 1996 CHRYSLER CIRRUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 141,635 MILES
96 CHRYSLER CIRRUS BURNS 2 MUCH GASCECK ENGINE LITE ON. CODES -PO171/P0300/P0302
#6 MIS FIRE/BANK 1 TOO LEAN/ AUTO ZONE CHECK. READINGS POSSIB. PCM, MAO, OR O2 SEN.
WHICON SHOULD REPLACE, PCM
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Thursday, April 9th, 2009 AT 7:02 AM

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Tiny
RASMATAZ
  • MEMBER
A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires
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Thursday, April 9th, 2009 AT 7:30 AM
Tiny
CARADIODOC
  • EXPERT
Vacuum leak definitely IS a possibility, but Chrysler never used a Mass Air Flow sensor. Unlike GM and Ford, Chrysler is the only one that can make an engine run right without one.

The major hint is the "Cylinder # 6 Misfire". If there is a problem with spark, the unburned mixture goes into the exhaust. You might smell some unburned fuel out the tail pipe or see some black smoke. The extra fuel is hard on the catalytic converter too.

But guess what the oxygen sensor reports to the engine computer? A LEAN condition! Oxygen sensors detect unburned oxygen, not fuel. Since the computer thinks the mixture is lean, it lengthens the amount of time the injectors are turned on. The result is too much fuel entering all six cylinders, and you still have the unburned oxygen from cylinder # 6, so the computer still thinks the mixture is lean.

The engine computer is telling you the problem, (a misfire), and the result, (one side if the engine's exhaust is lean). Fix the cause; don't go wildly throwing parts at the result.

Thank you for supplying good information.

Caradiodoc
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Friday, April 10th, 2009 AT 4:15 AM

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