# Bmw X5 2005 misfire **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** x5, bmw\ **Created:** [February 6, 2018, 12:13am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016 "2018-02-06T00:13:27Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Alex170](https://avatars.discourse-cdn.com/v4/letter/a/5fc32e/32.png) [@Alex170](https://community.cartalk.com/u/Alex170)\ **Post date:** [February 6, 2018, 12:13am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/1 "2018-02-06T00:13:27Z")
Hi guys I have a BMW X5 2005 3.0 6 cylinders and 2 days ago car started shaking and check engine light came on. Check for the codes and it says P0303 code which is a misfire on piston 3. Changed all spark plugs but it’s still the same. Car lost a lot of power and it’s shaking a lot when it stops. If anyone know what is happening please help. Is the only car i got and don’t want to lose my job ---
**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:** [February 6, 2018, 12:18am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/2 "2018-02-06T00:18:24Z")
Try swapping the ignition coil from cylinder 3 to another cylinder. If the miss moves with the coil, it’s the coil. Tester ---
**Author:** ![Alex170](https://avatars.discourse-cdn.com/v4/letter/a/5fc32e/32.png) [@Alex170](https://community.cartalk.com/u/Alex170)\ **Post date:** [February 6, 2018, 12:38am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/3 "2018-02-06T00:38:21Z")
I did it i switched with 4 & now i got misfire on both 3 and 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:** [February 6, 2018, 12:43am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/4 "2018-02-06T00:43:17Z")
Gee? I wonder if you need new coils? Tester ---
**Author:** ![Alex170](https://avatars.discourse-cdn.com/v4/letter/a/5fc32e/32.png) [@Alex170](https://community.cartalk.com/u/Alex170)\ **Post date:** [February 6, 2018, 12:45am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/5 "2018-02-06T00:45:11Z")
Probably it’s one coil but even when i moved that coil it still says that i have a misfire on 3 ---
**Author:** ![thegreendrag0n](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thegreendrag0n/32/9265_2.png) [@thegreendrag0n](https://community.cartalk.com/u/thegreendrag0n)\ **Post date:** [February 6, 2018, 3:18am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/6 "2018-02-06T03:18:48Z")
was the code cleaned after you moved 3 into 4 ? ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [February 6, 2018, 3:42am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/7 "2018-02-06T03:42:59Z")
If you want to try something yourself, replace the original coil 3. If the misfire code continues on 4 and the engine continues to run poorly, replace that coil too. In order to get the necessary number of loops to produce 40 thousand volts +, coils are made with very thin wire that can break as the coil dimensions change with temperature. ---
**Author:** ![Manolito](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/manolito/32/3070_2.png) [@Manolito](https://community.cartalk.com/u/Manolito)\ **Post date:** [February 6, 2018, 4:12am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/8 "2018-02-06T04:12:11Z")
Coils are a common failure on BMWs of this vintage. If you go to the BMW dealer, they are selling a different brand for this car now, not the oem Bosch. They say it is better. It had better be be better for $110 each!. If your dealer stocks the original Bosch coils, they charge $55 each for them. You can get original Bosch coils on line at a vendor like ECS for less than $25 each. I bought one expensive one from the dealer so I could get to work, and two Bosch coils on line. I have two 2004 BMWs. The one with 225k miles has had three coils replaced (other three will fail sometime, I expect) The other with 155k miles still has all its original coils. ---
**Author:** ![Alex170](https://avatars.discourse-cdn.com/v4/letter/a/5fc32e/32.png) [@Alex170](https://community.cartalk.com/u/Alex170)\ **Post date:** [February 6, 2018, 4:15am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/9 "2018-02-06T04:15:08Z")
I had only misfire on 3 after changin all spark plugs nothing changed, so moved coil 3 to 4 ond coil 4 to 3 to see if the code will move from 3 to 4 bu what happened is that now i got misfire on both of them ---
**Author:** ![Alex170](https://avatars.discourse-cdn.com/v4/letter/a/5fc32e/32.png) [@Alex170](https://community.cartalk.com/u/Alex170)\ **Post date:** [February 6, 2018, 4:16am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/10 "2018-02-06T04:16:42Z")
Ok guys thanks very much. I’ll replace the coils and i will let u know ---
**Author:** ![Manolito](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/manolito/32/3070_2.png) [@Manolito](https://community.cartalk.com/u/Manolito)\ **Post date:** [February 6, 2018, 2:51pm UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/11 "2018-02-06T14:51:22Z")
When you replaced those spark plugs, was there any oil on the spark plug wells? A leaking valve cover gasket will slowly fill the spark plug well with oil. A little oil can short out a plug, and is more likely to do it when the engine is cold, ---
**Author:** ![Alex170](https://avatars.discourse-cdn.com/v4/letter/a/5fc32e/32.png) [@Alex170](https://community.cartalk.com/u/Alex170)\ **Post date:** [February 7, 2018, 1:59am UTC](https://community.cartalk.com/t/bmw-x5-2005-misfire/112016/12 "2018-02-07T01:59:30Z")
I think one os spark plugs had some oil. I didn’t pay a lot attention to it, what does it means