# Spark plugs misfiring, recent valve cover gaskets and well gaskets replaced **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [January 7, 2019, 8:29pm UTC](https://community.cartalk.com/t/spark-plugs-misfiring-recent-valve-cover-gaskets-and-well-gaskets-replaced/132205 "2019-01-07T20:29:42Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Jeremy\_Sperling](https://avatars.discourse-cdn.com/v4/letter/j/d07c76/32.png) [@Jeremy\_Sperling](https://community.cartalk.com/u/Jeremy_Sperling)\ **Post date:** [January 7, 2019, 8:29pm UTC](https://community.cartalk.com/t/spark-plugs-misfiring-recent-valve-cover-gaskets-and-well-gaskets-replaced/132205/1 "2019-01-07T20:29:42Z")
2004 Hyundai tiburon GT V6 First had replaced in the beginning of 2018 by a mechanic shop, same symptoms started again last month with misfiring when idle and steady worsening to acceleration and then driving. Replaced gaskets in the title (spark plug 5 and 6 were the culprits, so MUCH oil in them) and worked PERFECTLY, a week later same symptoms and progressively worsening faster than before. I checked my spark plugs this morning, all clean. No oil AT ALL, hooray! But now I don’t know what the problem is! The valve cover was torqued to 10-15. RTV placed too. Also, my check engine light came on for a day but has been gone since but the problem is worsening. ---
**Author:** ![TenB33R5](https://avatars.discourse-cdn.com/v4/letter/t/b77776/32.png) [@TenB33R5](https://community.cartalk.com/u/TenB33R5)\ **Post date:** [January 7, 2019, 8:43pm UTC](https://community.cartalk.com/t/spark-plugs-misfiring-recent-valve-cover-gaskets-and-well-gaskets-replaced/132205/2 "2019-01-07T20:43:50Z")
You can take your car to one of the big name brand auto parts store and they should be able to read the code that was thrown. That may give you a clue where to start looking. ---
**Author:** ![Jeremy\_Sperling](https://avatars.discourse-cdn.com/v4/letter/j/d07c76/32.png) [@Jeremy\_Sperling](https://community.cartalk.com/u/Jeremy_Sperling)\ **Post date:** [January 7, 2019, 8:44pm UTC](https://community.cartalk.com/t/spark-plugs-misfiring-recent-valve-cover-gaskets-and-well-gaskets-replaced/132205/3 "2019-01-07T20:44:57Z")
They can read it even though it’s not on anymore? ---
**Author:** ![TenB33R5](https://avatars.discourse-cdn.com/v4/letter/t/b77776/32.png) [@TenB33R5](https://community.cartalk.com/u/TenB33R5)\ **Post date:** [January 7, 2019, 8:45pm UTC](https://community.cartalk.com/t/spark-plugs-misfiring-recent-valve-cover-gaskets-and-well-gaskets-replaced/132205/4 "2019-01-07T20:45:32Z")
Yes it will be stored in the ecu. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [January 7, 2019, 9:07pm UTC](https://community.cartalk.com/t/spark-plugs-misfiring-recent-valve-cover-gaskets-and-well-gaskets-replaced/132205/5 "2019-01-07T21:07:39Z")
If the Check Engine light isn’t on, it requires a scanner capable of retrieving history codes. Tester ---
**Author:** ![pyrolord314](https://avatars.discourse-cdn.com/v4/letter/p/6a8cbe/32.png) [@pyrolord314](https://community.cartalk.com/u/pyrolord314)\ **Post date:** [January 8, 2019, 5:50pm UTC](https://community.cartalk.com/t/spark-plugs-misfiring-recent-valve-cover-gaskets-and-well-gaskets-replaced/132205/6 "2019-01-08T17:50:48Z")
> [@Jeremy\_Sperling](#): > > They can read it even though it’s not on anymore? No, most part stores do not have a scanner capable of reading history codes ---
**Author:** ![Jeremy\_Sperling](https://avatars.discourse-cdn.com/v4/letter/j/d07c76/32.png) [@Jeremy\_Sperling](https://community.cartalk.com/u/Jeremy_Sperling)\ **Post date:** [January 8, 2019, 5:56pm UTC](https://community.cartalk.com/t/spark-plugs-misfiring-recent-valve-cover-gaskets-and-well-gaskets-replaced/132205/7 "2019-01-08T17:56:50Z")
It’s alright, I changed the spark plug wires and all is good 🙂