1999 Chrysler Cirrus misfiring

Tiny
USERLIT324
  • MEMBER
  • 1999 CHRYSLER CIRRUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 185,978 MILES
Misfiringon 4 and 5 obd readout is po171/po304/po305/po300
Friday, March 27th, 2009 AT 5:16 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0171

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)

P0300 Random misfire-normally caused by vacuum leaks and bad fuel.

P0304/P0305-check that cylinder's sparkplug/compression/injector.
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Friday, March 27th, 2009 AT 5:21 PM

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