So I went and replaced my spark plugs this weekend. And come to my amazement, cylinder 1 has been retapped with a spark plug thread repair kit.

From the records i show, I see on 4/11/2019, that the spark plugs were replaced by Firestone. they used E3 spark plugs total crap

Waiting on PO to see if it was like that before hand, but my gut tells me it was fine before firestone got it.

Heck firestone replaced the brake cylinders on the rear and they are leaking again based on the receipt. they replaced that stuff with Vatozone equipment.

How do you kindly go about asking them to give you a new head....lol luckily it only happened on cylinder 1. they learned theeir lesson on the rest.

I got the denso in, and was able to carefully pull that thread insert off the old plug. But to me its a ticking time bomb till it blows the plug, maybe.

need advice.