Engine running rough?

Tiny
ANITA BIECHLER
  • MEMBER
  • 2010 CHRYSLER TOWN AND COUNTRY
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Fuel injectors and fuel injector wiring harness.
EGR valve
Mass air flow sensor
Spark plugs plug wires
Coil pack
Crankshaft position sensor
Alternator
PCM

Beating our heads against the wall
Cylinders 1 and 5 have no spark.
Catalytic convertor has been disconnected and still running rough.
Esp bas light is on dash check engine light.

Please help.
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Saturday, December 3rd, 2022 AT 2:17 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi Anita,

Are the parts you indicated at the start of your post what has been replaced?

Here is how this works. The coil receives power via one wire, a brown one with a white tracer. It must have that, or you wouldn't get spark to the other cylinders.

So, next, the PCM provides a ground path for the cylinders to fire. If I recall, both cylinders 3 and 5 are fired at the same time. One spark is used and the other is wasted.

So, here is what we need to do. First, disconnect the negative battery terminal. Then, remove connector 2 at the PCM. (See pics 1 and 2 below)

Locate pins 7, 9, and 10. Check each wire for continuity between the PCM and the ignition coil.

Let me know what you find.

Joe.

See pics below. Note: Pic 3 shows connector 2 on the PCM.
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Sunday, December 4th, 2022 AT 7:10 PM

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