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Ydhtbiotsao
Novice
Jul 13, 2023, 3:24 PM
Post #1 of 2
(996 views)
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2017 Hyundai Sonata Hybrid 63000 miles: Engine runs rough, shutters. This is usually when load increases to as much as a gentle incline. Dealer said the diagnostic is $140 and that does not go toward any maintenance or repair. So we took it to O'Reilly's and they said the #3 cylinder was getting a misfire.
Now I can imagine the hybrid nature might need some high tech synchronizing between combustion and battery power. Yet it seems it would be smarter for me to at least replace the #3 spark plug. Or not? And I say at least because I could probably do quite a bit - try this and that quite a bit before I reach $140.
But I have another worry. We had a couple of recalls. The mechanics in our area did not have the qualifications to fix the problems. We had to wait quite some time (weeks!) before a qualified tech would be in our area to do the recall. So I am simply worried the technicians might damage the car - do the wrong thing, not tell me, etc., etc., etc. In fact, I think, not sure of course, but we think the car has been shuddering since that last recall. It is an off and on shutter.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 13, 2023, 4:49 PM
Post #2 of 2
(990 views)
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Re: BeforeDiagnostic
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You have a misfire. Not uncommon at all although the mileage is kinda low for that.
You most likely have a weak coil that has contaminated the spark plug by now. I would at minimum replace that one coil and plug but I would recommend replacing all 4 plugs at the same time along with the coil.
Use only NGK or Denso brand plugs only
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jul 13, 2023, 4:50 PM)
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