Originally Posted by JustinH
Originally Posted by ChrisD46
+1 on the 2.4L ... Why I just got my recall notice from Hyundai to have new software added to detect impending engine failure via the knock sensor . Problem is 1 in about 3 who have the recall software installed experience worse engine issues than before they took their vehicle in to Hyundai ! Lastly , Hyundai has set aside $800 million to replace the 2.4L Theta II engines which STILL do not solve the problem of a bad Theta II design ! ... Stay away from this Hyundai / Kia 2.4L engine and you will avoid known poor design issues .
Originally Posted by tony1679
Definitely stay
within Hyundai's recommendations if you're under warranty. I can't believe nobody has mentioned the Theta II engine failures
. Sure, it would be nice to get your money's worth out of the oil, but if you're part of the X% with a bad build, I sure wouldn't want to give Hyundai any ammo to fight a warrantied engine swap.
The Theta II is the reason I ended up choosing the 1.8L...
I have been running the new PCM software for a couple months now. A couple comments. Driveability is much improved. Car does not ping on 89 octane, except once in a blue moon. Car overall runs better. Get it done.
Apparantly there is some tuning in there to put the car in limp home mode if the rods are knocking. Mine does not knock just light spark knock once in a while.
I've been happy with it on Shell 89 octane, and 3750 oil changes at the dealer for $26. Also a switch to 5w30 by Hyundai dealer has reduced oil consumption to nearly zero.
I'll stick with the dealer oil changes until the engine recall warranty runs out, then trade it on something else.
*I have heard some horror stories regarding the new software update causing failures in many affected Sonatas that were running fine before undergoing the software update - then there are others that have a positive experience as you have had ... I need to learn more first .