Engine running rough?

2010 CHRYSLER TOWN AND COUNTRY

170,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC

ANITA BIECHLER

MEMBER
2 POSTS

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.

Image (Click to enlarge)

Dec 3, 2022 at 2:17 PM

JACOBANDNICKOLAS

✓ASE Certified Mechanic
110,194 POSTS

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.

Images (Click to enlarge)

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Dec 4, 2022 at 7:10 PM

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