2011 Accent - 4 new coils , all new spark plugs, in past 3 months and still getting misfire. What else should be checked ?

Asked by Feb 10, 2016 at 12:47 PM about the 2011 Hyundai Accent

Question type: Maintenance & Repair

Car bought used from Hyundai dealer in Aug. 2014.    In Nov. 2014, stopped
dead on highway.  Dealer replaced Coil #1 and all spark plugs.  May 2015,
stopped dead again on highway, dealer replaced Crank Shaft.  Oct. 2015,
Check Engine light came on, dealer replaced Coil #1 again.  Nov. 2015, Check
Engine light - dealer replaced Coil #2.  Dec. 1, 2015, Check Engine light -
Dealer replaced Coil #3.  Dec. 2,2015 - Check Engine light - dealer replaced
Coil #4.  Dec. 15 - all spark plugs replaced again (after 1 year).  Jan. 19, 2016 -
Check engine light - Dealer says 'loose spark plug'.  Feb. 3 - did 96,000 km
service (a bit early) at dealer (belts replaced, transmission fluid service, etc).  
Feb. 7 - Check Engine light came on indicating misfire.  No fault could be
found by non-dealer mechanic.     Just waiting now for light to come on again !   
Car has about 92,000 km and 2 months left on 5 year warranty.    Any
suggestions on what might be going on ?  The dealers just seem to replace
parts without worrying about what is causing the problem.

1 Answer

One more piece of information - the last two times the check engine light came on, it has been when I started the car. Not while driving.

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