Rough Idle when starting car ..even on 70 deg evenings the night before - Hyundai Elantra GT Turbo & Elantra GT N Performance Forum
 
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post #1 of 6 (permalink) Old 04-06-2020, 01:13 PM Thread Starter
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Rough Idle when starting car ..even on 70 deg evenings the night before

Please advise if anyone else has noticed rough idle in mornings when you start up car ? Sounds like it's missing.. sounds rough under hood and from the exhaust ... after about 5 mins it goes away and idle is back to normal. Please advise if anyone has spoke to dealer regarding this issue or if having the same issue . It did not due this for the first 3500 miles .. but after I had lost power while driving ..pushed on gas and no acceleration... it started ... took to dealer and they just swapped ignition coils...did not replace with new ignition coils.. since they said there was a miss fire code they saw.. please advise thanks ... even after they did that ...still having rough start/idle in mornings... thanks
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post #2 of 6 (permalink) Old 04-06-2020, 04:28 PM
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How'd they justify not replacing one or more coils? Normally you do a coil swap to see if the misfire follows the coil. If the misfire persists on the same cylinder then the source of the problem is not the coil. I would think with a warranty repair they wouldn't make you mess around with a coil swap.
I'd get it back to the dealer ASAP. If it's misfiring that typically means some unburnt fuel is getting to the cats, which is damaging to the cats.
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post #3 of 6 (permalink) Old 04-06-2020, 06:16 PM Thread Starter
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They didnt replace the ignition coils ..because they swapped them and they advised me that they fixed it by swapping them .. but that is a concern that they just did a bandage to the issue and didnt fix it correctly ... would that be an issue for you too .. if they had done that as a fix for a new car ?? Thanks And when you stated Cats in your response.. you ment the catalytic converter ? Yes ?
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post #4 of 6 (permalink) Old 04-07-2020, 09:19 AM
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Yes it doesn't make any sense to say repositioning an ignition coil to another cylinder is a fix. Particularly when you're experiencing the issue. I'd bring the car back to the dealer.
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post #5 of 6 (permalink) Old 04-09-2020, 08:37 AM Thread Starter
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I'm at Hyundai Dealer ..the tech started it up .. & it was rough sounding .. & rpms at 1500 rpm .. then about 2 mins later it dropped to 900 rpms and ..not rough / throaty sounding ... very smooth sounding .. he acted as it was supposed to do that ..when prior to the misfire .. and acceleration / power ..lack off at 3593 miles .. it was not sounding that way ... I will wait & see what they find out ...

also the issue with my tires wearing on inside edge (cupped) on rear of car ... serv advisor stated it was due to rotation .. I know its usually caused by suspension issues/ shocks .. or out of balance tires .. please advise
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post #6 of 6 (permalink) Old 04-09-2020, 09:35 AM Thread Starter
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The Rough sounding engine happens a time car has sat for 4hrs or more ..FYI .. not just in the morning
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