# Spark plug blow out **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mercury, grandmarquis\ **Created:** [August 18, 2019, 4:11pm UTC](https://community.cartalk.com/t/spark-plug-blow-out/146967 "2019-08-18T16:11:33Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Fordguy1992](https://avatars.discourse-cdn.com/v4/letter/f/c0e974/32.png) [@Fordguy1992](https://community.cartalk.com/u/Fordguy1992)\ **Post date:** [August 18, 2019, 4:11pm UTC](https://community.cartalk.com/t/spark-plug-blow-out/146967/1 "2019-08-18T16:11:34Z")
I have a 2001 Mercury Grand Marquis. My spark plug blew out. It sounds like a lawn mower. What is the cost of repairing this? ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [August 18, 2019, 4:15pm UTC](https://community.cartalk.com/t/spark-plug-blow-out/146967/2 "2019-08-18T16:15:24Z")
The cost varies based on a number of factors along with the location of the spark plug hole. It shouldn’t be too bad; 100 bucks up maybe? Do not buy into the premise that the cylinder head must be removed or replaced to do this. A Time-Sert or Heli-Coil will work fine. ---
**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:** [August 18, 2019, 4:43pm UTC](https://community.cartalk.com/t/spark-plug-blow-out/146967/3 "2019-08-18T16:43:05Z")
A strong caution . . . Install a time-sert NOT helicoil NOT some store-brand insert ONLY time-sert ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [August 18, 2019, 6:51pm UTC](https://community.cartalk.com/t/spark-plug-blow-out/146967/4 "2019-08-18T18:51:26Z")
Just curious, but why no Heli-Coils? I worked for 2 VW dealers and we got the air cools in all the time with blown plugs. This was caused by people overtightening them and the awkwardness of changing them and even with a 6 to 1 CR they would let go. We used nothing but Heli-Coils. I’ve used HCs in the repair of the cylinder heads on my 1950 Harley Panhead with no issues. Just wondering is all. ---
**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:** [August 18, 2019, 6:57pm UTC](https://community.cartalk.com/t/spark-plug-blow-out/146967/5 "2019-08-18T18:57:06Z")
> [@ok4450](#): > > Just curious, but why no Heli-Coils? time-sert is the superior product . . . in this very specific instance . . . when dealing with plugs blowing out on a 2V Triton engine Maybe heli-coil is boss in other instances But not this time I’ve seen all other inserts . . . except time-sert . . . blow out repeatedly on these particular engines I’m obviously biased, but I’m also speaking with some experience . . . ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [August 19, 2019, 12:32am UTC](https://community.cartalk.com/t/spark-plug-blow-out/146967/6 "2019-08-19T00:32:50Z")
Point taken and info appreciated. At VW the HC kits were provided by the dealer and is what was recommended by VW. ---
**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:** [August 19, 2019, 1:12am UTC](https://community.cartalk.com/t/spark-plug-blow-out/146967/7 "2019-08-19T01:12:59Z")
I’m not sure if the time-sert brand was around when air-cooled VW engines were still in common use