Ok I am reaching our for some more experienced advise. Love the ETCG channel and new to the website and forum.
Customer brought in a 2004 Chrysler Grand Caravan wanting oil change and filter and DTC checked out
Code was P0306 with rough idle and O2 sensor Heater code
Customer had already changed the spark plugs, wires and coil.
I replaced the O2 sensor and #6 injector after checking below listed items
I started by rechecking all those by moving spark plugs ( No Change)
Moved wires ( No Change)
Checked Spark at coil and wire (Spark good at both ends)
Checked Signal from PCM with test light (Good Signal)
Completed Compression check all cylinders was 160-170 psi
Completed Leak down on #6 with only 10% leak
Completed leak down on #2 and #4 also with same results
Checked for vacuum leaks with propane (Nothing noted)
Checked manifold vacuum with gauge and was within normal ranges
I can’t find any issues with Spark, Fuel or compression
Not sure what to check next
My thought is electrical however if it is a spark issue why am I not seeing an issue with the companion cylinder misfiring also.
I don’t think its Fuel Pressure issue as its only one cylinder misfire.
Any advise would be greatly appreciated.
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