Spark Plug blowout - Mustang Evolution

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Old 02-14-2019, 08:44 PM   #1
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Spark Plug blowout

So got the spark plug replaced in my car. And less than 12 hours later I have a misfire, on cylinder 6. So the shop says it is a dropped valve. My friend that works on Chevy and Fords says it's a blowout from them not putting it in right. So he is saying fix the plug threads and get a new plug or use the same if it isn't bad. He said if it stays in limp mode like it did today around 11am he said get the computer flashed. What do yall think?
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Old 02-15-2019, 03:54 AM   #2
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I have never read or heard of a spark plug blowing out of a 3.7l in my life. If you did blow out a spark plug you will be the 'first one'
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Old 02-15-2019, 05:00 AM   #3
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If it wasnt a plug blowout, you would be leaning towards a dropped valve after I got my tune up done from a shop? That's what doesnt make sense after I got the tune up done it just drops a valve within 30 miles of the tune up.
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Old 02-15-2019, 06:54 AM   #4
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They also said it completely failed the compression test in cylinder or valve 6 not sure
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Old 02-15-2019, 06:55 AM   #5
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They also said it completely failed the compression test in the cylinder or valve test
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Old 02-15-2019, 07:53 AM   #6
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They also said it completely failed the compression test in the cylinder or valve test
They were able to completely thread a compression tester into the threads on #6? If that is the case, and your engine still showed no compression in that cylinder, then you have internal problems bigger than popping out a plug.....
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Old 02-15-2019, 10:37 AM   #7
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Have you actually looked at the plug and the spark plug hole? If it "blew out", the threads would be stripped and they would not be able to do a compression check without first re-threading the hole. You said you "got the spark plug changed" (singular), meaning only one plug and it was the plug that "blew out"? The same shop then diagnosed a dropped valve from a spark plug being blown out? Am I missing something?
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Old 02-15-2019, 12:02 PM   #8
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There’s something fishy going on. Do you have an Autozone close? If I were you I would rent a compression tester and test out cylinder 6 myself or at least take it to a different shop for a second opinion.
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Old 02-15-2019, 04:14 PM   #9
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So I took it to another shop and they started it and he said but the sound of it, he said it was something else dealing with the valve springs the risers is what I believe he said
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Old 02-15-2019, 05:00 PM   #10
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That makes no sense either. Did you drive it to another shop with a blown out spark plug?
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Old 02-17-2019, 06:42 PM   #11
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Okay here's what is going on: first thing first is I didnt drive to the other shop I had it towed there.

The spark plug threads are fine for the cylinder 6, but the spark plug gap is at .024 instead of .050. I have a cracked piston and some scarring in the cylinder wall all on the 6th cylinder. The spark plugs are also way over tighten not at factory specifications. The shop I took it to says it's around 40-50 lbs torque on the spark plugs for 4 5 and 6. Causing the plug to start a brown ring around where the boot of the plug goes, meaning a leak was present. They said I would need a new engine. He also stated there is something going on with the lifters on cylinder 6 not sure if it's the exhaust valve or intake valve, or if it's even bent


If yall would like to see the spark plugs I have a KIK or snapchat and I can show you the plugs from cylinder 4 5 and 6. I might try and post the pics from my phone through the app, on my old phone
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Old 02-18-2019, 03:33 AM   #12
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Sounds like someone dropped something down the spark plug hole
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Old 02-18-2019, 04:11 AM   #13
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That's what I'm thinking too or that spark plug not being gapped correctly will cause a cracked piston as well
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Old 02-18-2019, 04:22 AM   #14
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As well as who ever over tighten down the all of the plugs as well
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Old 02-28-2019, 11:27 AM   #15
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Glad I changed my own spark plugs now!
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Old 02-28-2019, 06:30 PM   #16
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Boy Howdy, me too!
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Old 03-08-2019, 04:34 PM   #17
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I just had my spark plugs change by a dealership (long story but it was free) and my car is now misfiring on #6. Is #6 the back driver side or back passenger side? The tech came to my house (50 miles away) and was looking at the back driver side. I thought I looked before and it said it was the back passenger side. Thanks for any help!
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Old 03-08-2019, 06:40 PM   #18
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I just had my spark plugs change by a dealership (long story but it was free) and my car is now misfiring on #6. Is #6 the back driver side or back passenger side? The tech came to my house (50 miles away) and was looking at the back driver side. I thought I looked before and it said it was the back passenger side. Thanks for any help!
Should have started your own thread, but anyway, if the "tech" can't figure it out, send him on his way and ask them to send someone that knows what they are doing. You can google the firing order.....
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Old 03-08-2019, 08:47 PM   #19
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Should have started your own thread, but anyway, if the "tech" can't figure it out, send him on his way and ask them to send someone that knows what they are doing. You can google the firing order.....
How is this not on topic? The OP had someone put in spark plugs, got a misfire and it was cylinder 6. I had someone put in spark plugs, got a misfire and it was cylinder 6. I just asked where cylinder 6 was because I thought it was on the passenger side. If it was, I was going to tell the service manager to put someone different on the car. I'm now worried that I might have a cracked piston or something because it's sounding like what happened to the OP.
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Old 03-08-2019, 09:17 PM   #20
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How is this not on topic? The OP had someone put in spark plugs, got a misfire and it was cylinder 6. I had someone put in spark plugs, got a misfire and it was cylinder 6. I just asked where cylinder 6 was because I thought it was on the passenger side. If it was, I was going to tell the service manager to put someone different on the car. I'm now worried that I might have a cracked piston or something because it's sounding like what happened to the OP.
Cylinder #6 is on the driver's side, nearest to the firewall.
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Old 03-08-2019, 09:27 PM   #21
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Cylinder #6 is on the driver's side, nearest to the firewall.
Thanks. Fingers crossed its nothing.
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Old 03-09-2019, 01:32 PM   #22
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They said the plug was arcing out of the collar. I asked what would cause that and the service manager said "Either a bad plug or someone not paying attention to what their doing to be honest."

This will be the last time I take my car to this dealership.
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Old 03-23-2019, 03:12 AM   #23
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I finally have the verdict of why my engine is miss firing they dropped a intake bolt down the main vacuum on cylinder number 6 which is what caused it. After the other shop found it, I called them and they didn't want to pay for their negligence, so we all now know what happens next😂
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Old 03-23-2019, 04:57 AM   #24
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Sad to hear about this
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Old 03-23-2019, 08:09 AM   #25
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WOW, that sucks. Off to court now?
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Old 03-24-2019, 12:23 PM   #26
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Definitely going to court. But, more then likely it'll settle outside of court
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Old 03-24-2019, 01:03 PM   #27
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Definitely going to court. But, more then likely it'll settle outside of court
Give em hell! Good luck! Please keep us updated!
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Old 03-28-2019, 07:37 PM   #28
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Geez, those guys/gals definitely win the Dumbass Prize of 2019.
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