2002 Dodge Intrepid DTC P0301

MOUSE23

MEMBER
2002 DODGE INTREPID
6 CYL
FWD
AUTOMATIC
91,000 MILES

Http://www.2carpros.com/forum/2002-dodge-intrepid--ignition-coil-circuit-codes-vt171125.htm

I have read your advise you gave on the above linked website and I still have the P0301 DTC.

With a current probe and oscilloscope I measured the current through each ignition coil. (Stripped the sleeve back an inch at coil connector)

With the engine cold I get a sawtooth shaped current wave form of 14amp p-p and 15msec. on all coils.

After a few minutes warm up the peak suddenly reduces to 5amp 5msec except for #1 which goes to 3amp 5msec.

Engine does not run smooth but is drive-able.

Can anyone verify that current reduction is normal before I go and spend a couple of C-notes on a re-manufactured PCM?

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

P0301 indicates a misfire at cyl. No.1 -check the sparkplug, compression and injector for this cylinder

Engine misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel