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What could be causing my 2009 Jeep Wrangler to "miss", especially at lower rpm's?

I took it to the dealer to get an oil change and after I got it back I noticed that it sputters and misses, especially at lower rpms. It didn't have this issue before I took it there. Coincidence? No warning lights have come on

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  • Jeep Master
  • 20,706 Answers

Miles on engine are what>???
when was last tuneup, never?
they dont mess with much doing an oil change.
misfire sure will set scanned DTC errors, p03xx errors.
but you did not scan, it so missed that.
or its in pendings.
some cars like in canada have this nice list of DTC errors
that do NOT turn on the CEL lamp, so scanning only works.
on this car, lots of things dont turn on the lamp. CEL.
"Check ENGINE LAMP"
the shop manual explains all this, huge number of possibles.
now my wild and useless guess, (id do tests! Id scan it )

  1. he bumped your old coil wires on the coil pack and 1 broke
  2. or is loose, do not mix those 6 wires up (3.8L v6 in my 08)
  3. got bad fuel.
  4. spark plugs fouled,
  5. lay blame later after its fixed is always best. (w/facts)

if you scanned it and it showed, P0306, then spark wire 6 is loose
saving all this guessing.
one example.

Posted on Dec 19, 2016

  • Anonymous Dec 20, 2016

    all cars not serviced (tuneup) all misfire.
    when they do , is under load, mostly.
    but ever like put in new spark plugs .
    no engine stated
    so no real help possible.
    nor did you scan it.
    the CEL glowing means scan it.
    or get car serviced, 99% do this.

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  • Jeep Master
  • 15,478 Answers

Use a scan tool to be sure that there is no issue with the check engine light. If you get a scan tool that shows error codes in the 300 range then it is a misfire. Some causes of this are low fuel pressure, bad coils, etc.

Posted on Dec 18, 2016

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