# I need answers! **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [September 7, 2008, 11:08pm UTC](https://community.cartalk.com/t/i-need-answers/19268 "2008-09-07T23:08:51Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![vjc2009](https://avatars.discourse-cdn.com/v4/letter/v/278dde/32.png) [@vjc2009](https://community.cartalk.com/u/vjc2009)\ **Post date:** [September 7, 2008, 11:08pm UTC](https://community.cartalk.com/t/i-need-answers/19268/1 "2008-09-07T23:08:51Z")
I have a 2007 Hyundai Elantra. What would cause a misfire in cylinder #4??? ---
**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:** [September 7, 2008, 11:15pm UTC](https://community.cartalk.com/t/i-need-answers/19268/2 "2008-09-07T23:15:06Z")
Many things! Are you sure you’re not covered by the two year/24,000 mile emission warranty from the manufacturer? Tester ---
**Author:** ![vjc2009](https://avatars.discourse-cdn.com/v4/letter/v/278dde/32.png) [@vjc2009](https://community.cartalk.com/u/vjc2009)\ **Post date:** [September 7, 2008, 11:17pm UTC](https://community.cartalk.com/t/i-need-answers/19268/3 "2008-09-07T23:17:38Z")
i’m not sure if i am or not. what would be some of the things that could cause it? When i took it to the dealer, they said it was the spark plugs? ---
**Author:** ![jayhawkroy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/jayhawkroy/32/33_2.png) [@jayhawkroy](https://community.cartalk.com/u/jayhawkroy)\ **Post date:** [September 7, 2008, 11:38pm UTC](https://community.cartalk.com/t/i-need-answers/19268/4 "2008-09-07T23:38:34Z")
I think the Elantra has a 30K spark plug change interval. Where are you in terms of miles? ---
**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\ **Post date:** [September 7, 2008, 11:53pm UTC](https://community.cartalk.com/t/i-need-answers/19268/5 "2008-09-07T23:53:48Z")
Elantras have a 10-year, 100,000 mile powertrain warranty. Take it to the dealer. ---
**Author:** ![vjc2009](https://avatars.discourse-cdn.com/v4/letter/v/278dde/32.png) [@vjc2009](https://community.cartalk.com/u/vjc2009)\ **Post date:** [September 8, 2008, 12:05am UTC](https://community.cartalk.com/t/i-need-answers/19268/6 "2008-09-08T00:05:35Z")
about 31,000. I bought it used and it’s an 07. The guy I bought it from told us it was fully inspected before we bought it, but maybe not as fully as he thought… ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [September 8, 2008, 1:48am UTC](https://community.cartalk.com/t/i-need-answers/19268/7 "2008-09-08T01:48:05Z")
That powertrain warranty only applies to the original purchaser. Subsequent owners only get the remainder of the 3 year/36K mile bumper-to-bumper warranty. So the OP may still be covered here. ---
**Author:** ![Countrydriver](https://avatars.discourse-cdn.com/v4/letter/c/ce7236/32.png) [@Countrydriver](https://community.cartalk.com/u/Countrydriver)\ **Post date:** [September 8, 2008, 3:18am UTC](https://community.cartalk.com/t/i-need-answers/19268/8 "2008-09-08T03:18:12Z")
That’s right. Change the plugs. ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [September 8, 2008, 4:15am UTC](https://community.cartalk.com/t/i-need-answers/19268/9 "2008-09-08T04:15:22Z")
There are other things that could cause a miss on cylinder 4 also. Bad injector, coil, etc. Spark plugs are not going to be warrantable after 24k miles and they’re considered a maintenance item. I realize the car only has 31k miles on it but you bought it used and if the car were mine, and since the plugs need to come out as a first step, a compression test should be run. Who knows if a prior owner may or may not have overheated it and caused a loss of compression. If a mechanical fault exists due to fried piston rings, iffy head gasket, etc., then one could throw parts at it forever and solve nothing. I say pull the plugs, run a compression test, and make absolutely certain that the engine does not have a serious problem before going very far with this. Did you buy this from a dealer or an individual? If a dealer picked up a problem car at auction they may have sold it to you not knowing there is a problem. If an individual sold you a problem car then you can pretty well figure they knew about it.