# Spark plugs - 2007 Lexus ES 350 **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** lexus, es350\ **Created:** [October 28, 2018, 9:37pm UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729 "2018-10-28T21:37:40Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![georgetarver](https://avatars.discourse-cdn.com/v4/letter/g/df788c/32.png) [@georgetarver](https://community.cartalk.com/u/georgetarver)\ **Post date:** [October 28, 2018, 9:37pm UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/1 "2018-10-28T21:37:40Z")
I’ve had the car since new and this just started happening 3 years ago. I would get the VSC, anti-slip and engine light and the car I could feel was misfiring. But what I did notive is that i was getting 560 miles per tank wersus 430… WOW I didn’t want to correct it but I knew the engine wasn’t right. I changed to plugs and a coil here or there from the auto zone diagnostics tool-3 of the sparks posts were gone, I didn’t use the iridium. But I’ve gone through this 3 times now. It has to be something sending the voltage to the sparks. What do I need to look at, besides getting the shop to charge me 3 checks? ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [October 28, 2018, 10:11pm UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/2 "2018-10-28T22:11:04Z")
> [@georgetarver](#): > > I didn’t use the iridium I suggest using ONLY the exact spark plugs listed in the owner’s manual Either go to the Lexus dealer, or have a shop order the correct ones for you Don’t let auto zone talk you into buying the ones they have in stock . . . UNLESS those are exactly the ones listed in the owner’s manual How many miles . . . ? any of the spark plug boots visibly damaged? coil(s) visibly damaged? you did replace the plenum gaskets when you replaced the plugs the first time, I hope . . . ?! ---
**Author:** ![georgetarver](https://avatars.discourse-cdn.com/v4/letter/g/df788c/32.png) [@georgetarver](https://community.cartalk.com/u/georgetarver)\ **Post date:** [October 29, 2018, 12:18am UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/3 "2018-10-29T00:18:07Z")
I’ll check with the oem, i do replace the plenum gasket. I’ve got 260k miles on this and i want to drive it till it stops working. The spark comes were changed 6 months ago, though this time i didn’t use oem. I figure if i go to the parts store and read the code it will be another spark plug. I was wondering if it was a device sending the voltage erraticly. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [October 29, 2018, 12:32am UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/4 "2018-10-29T00:32:45Z")
Coil failures are seen more on the 2007-2008 ES350 and RX350 than any other year. What were the fault codes from your ECU? ---
**Author:** ![georgetarver](https://avatars.discourse-cdn.com/v4/letter/g/df788c/32.png) [@georgetarver](https://community.cartalk.com/u/georgetarver)\ **Post date:** [October 29, 2018, 12:49am UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/5 "2018-10-29T00:49:42Z")
Could it be the cat converters clogging? ---
**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:** [October 29, 2018, 12:59am UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/6 "2018-10-29T00:59:41Z")
> [@georgetarver](#): > > 3 of the sparks posts were gone If you are referring to the top of the spark plug that the boot or coil-pack plugs onto, if that part is being damaged or destroyed by running the engine, make sure the electrical contact there is good. If it isn’t a good electrical contact the spark will occur there and at the tip of the spark plug, which could explain both the misfiring (from a weak spark) and the damaged spark plugs. ---
**Author:** ![georgetarver](https://avatars.discourse-cdn.com/v4/letter/g/df788c/32.png) [@georgetarver](https://community.cartalk.com/u/georgetarver)\ **Post date:** [October 29, 2018, 1:01am UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/7 "2018-10-29T01:01:52Z")
The damage was at the post under the arc. I had an alternate plug then and that’s when i noticed my mileage was great. I just got the ecu read and our shows po304 only ---
**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:** [October 29, 2018, 1:10am UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/8 "2018-10-29T01:10:26Z")
P0304 is a misfire on cylinder number 4. Upon removal does the number 4 spark plug look different than the other three? ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [October 29, 2018, 1:56am UTC](https://community.cartalk.com/t/spark-plugs-2007-lexus-es-350/127729/9 "2018-10-29T01:56:14Z")
Suggest taking a close look at coil #4 . . . is it cracked? Might not be a bad idea to perform a compression test on #4 cylinder If there’s low compression, best to know now, versus throwing lots more money at the problem . . .