Greetings from Canada, Scotty! 2006 Hyundai Sonata, 3.3L, 160,000 kms I named her Sharona. (Sharona Sonata.) Runs like a top all spring, summer and fall. Last two winters when the temps go around…

MY SHARONA

Greetings from Canada, Scotty!
2006 Hyundai Sonata, 3.3L, 160,000 kms I named her Sharona. (Sharona Sonata.)
Runs like a top all spring, summer and fall.
Last two winters when the temps go around freezing, when I start her in the morning, she starts, then begins running rough after a few seconds, with the check engine light flashing. I can drive it to work, with it running like crap, shut it off, then at noon fire it up again and it runs fine! Every time! The check engine light then stays on, but lit solid. The third trip of the day the check engine light is off and she runs fine. I have even tried driving it 10 blocks, shutting it off, and on restart it works fine. What the heck?
If I plug it in for 4 hours before the first start of the day, it runs fine. Runs well the rest of the year. The last two winters it’s been like this. The Hyundai shop couldn’t find anything. There was another Sonata in the shop when I took mine in, and they cleaned injectors and did a whole bunch of other things, then they were going to do mine, but didn’t find anything that worked. I did get the spark plugs changed and it didn’t help. Have you seen this before? Only in winter, only for the first trip of the day...
(- had code P0300 multiple misfires.)
Thank you!!!

Tom Dupley

Comments (3)
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MY SHARONA
MY SHARONA

I love your YouTube except the time you said not to buy a Ridgeline. We found a 2013 with 30,000 miles owned by an old lady who bought a new one. We couldn't resist.... Now every time I put it in gear I wonder........

MY SHARONA
MY SHARONA

Thanks Scotty! It's weird. Run it 10 blocks shut it off, restart and it's golden. Every time. Ed the mechanic at Cranbrook Hyundai with 30+ years experience is baffled too. Love your YouTube stuff!!! Cheers! Spring is only 4 months away!

Scotty Kilmer
Scotty Kilmer

Editor

It's cold up there, I went to York U when dinosaurs roamed. You have some sort of cold weather electronic failure. Could be fuel pump, but more often computer circuits getting cold. Good luck on that if the only code is P0300. Anything from wiring to sensors to computers getting cold and not working with their tiny 5 volt reference signals