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If i can't get it loose by hand it was on way too tight. I'm not super strong. My ford 4.0 specs the 820s, although i have never used the motorcraft part.

Yes running a thread chaser through the plug hole and then the plug tightly and flush fixed the noise. Thank you to the poster who suggested this as the source. The car is running better than ever. I saw a video of another ford where someone said the hole was only threaded half way down from...

I got a much better mechanic and his diagnosis is leaking from the spark plug not being flush. The threads are too messed up to get it in correctly. Scheduled a rethread for the hole Tuesday with irridium plugs, no charge if the noise isn't gone.

Here's a picture from the borescope. I didn't see anything too shocking in there Maybe that is the embedded piece, to the left of the word compared. I switched back to my original alternator and the noise is much less. I'm going to exchange for another acdelco unit and see if it helps.

Yes, i actually like the noise. Feels like driving an agriculture vehicle. Could be mistaken for exhaust pop. Kinda loud compared to my Muffler, maybe i should make it louder. Searching youtube it sounds pretty close to a catalytic converter rattle. Maybe that is it, damage on the way out. As...

I had to drive the car about 50 miles with 5 stops yesterday for some unavoidable errands. The car runs great. The noise quieted down quite a bit the first time i hit 2k rpm, but gets loud again around that. Here is a video of the tach going from a stop light with the top down A borescope...

Simoniz from ollie's.

Its on the bottom from what i could tell. He thought it was free to snag enough to come back.

An update on this car: I called a mobile mechanic who said he can see the ground with his phone flashligight this will be easy, doesn't have a long enough tool. Came back the next day with a longer tool and said he doesn't think it's magnetic, then said it's fused, then said it's small and not a...

So should I try to vacuum it out or anything at this point or just see how and how long it drives?

That was with the plug removed. I searched on google and it said it would blow out any debris. Are you telling me my engine is gone and there is nothing to do? My friend said he can bring a shop vac tomorrow

I made a video of it and got the opinion it was a normal plugless sound. Maybe the opinion was wrong. I have uploaded it as well

It's the L shaped ground strap. Bigger than a tip. The noise started after I noticed it missing from the plug and read running the engine with the plug out will blow out debris. It does not make that sound with the plug out but does with the plug inserted loosely. I had just replaced the...

I will try to fish anything out when my friend with more tools is around. I had done all of these plugs a few months ago. I got a p316 code on one plug and noticed it was sticking out much further than the others today. I was just trying to redo one of them. Here is a video of the sound it is...

Thanks for all of your help. I have inserted a new plug finger tight and the noise persists. I have been told it sounds like piston knock, there is no cure. I should look into a compression test, but really just get a new car. It is throwing code p106. Thank you for your help. Any further...

I got them from msd and they said it is a fit. I have found a few threads about the issue with this engine. https://mustangforums.com/forum/2005-2014-mustangs/739361-bent-spark-plug-on-cylinder-3-a.html https://www.allfordmustangs.com/threads/can-the-piston-hit-my-spark-plug.62056/ I'm...

They're the plugs every website seemed to say fit. The 2 sets look different now that I compare, with the new actually being shorter

It seems to be something with the spark plugs hitting the piston with this engine from a YouTube video I've found. Now I'm thinking the noise is the plug itself. They get crushed like this when I pull them. It is not rattling like that without the plug removed. All of the plugs are same size as...

Yes the metal ground on the tip of the plug. I was installing the plug into the hole.

The ground strap broke off installing a new spark plug. I tried sticking a magnet in there and got nothing. I tried cranking with no plug in the hole. It rattles around pretty fiercely when I start the engine now. Anything else I should try at this point?