As the title states i took my car to a tuning shop with dyno. They are ready to tune for w.o.t. and they start seeing the power drop around 5k rpm so they shut the car off "check" everything and try again.
Well the engine accumulated a knock. So i trailer it back home and find cyl. 1 spark plug snapped in 2, the wire with the metal sleeve and spring was still stuck to the other half of the plug (enough to probaly missfire or weak spark?) However the knock is also coming from the same cylinder...
Could this have maybe caused pre det. And or in any way caused this knock?
I did replace all 8 plugs and double checked to see if it fixed the problem.. nope. Still a knock on #1 only.
I dont wanna get into detail but the shop i brought it to seemed very VERY unprofessional the whole way through the process, i wonder if they sabotaged me or are just acting like they dont know wtf happened so they dont have to pay or fix it, i just dont know if a plug could do that, but since they were putting it to the limits on a dyno....

 

From the pic you’ve posted, it looks as though the plug was firing for some time. Show another closeup pic of the electrode side of the broken plug. Prolly just a coincidence that this transpired when it did. Might of even saved you a hole in the block, if in fact you have a bearing problem. I’d pull the valve covers off to make sure you’ve not got an issue upstairs that maybe your confusing with a knock, which is two different sounds.
I have an acquaintance here locally who had his transmission case break while on the dyno at a really big nationally known shop that starts with a V, which is close to me. This was years ago and he still blames the shop for breaking his truck. Shop “V” here did nothing wrong at all, and sometimes things just break under WOT conditions.

 

"I have an acquaintance here locally who had his transmission case break while on the dyno at a really big nationally known shop that starts with a V, which is close to me. This was years ago and he still blames the shop for breaking his truck. Shop “V” here did nothing wrong at all, and sometimes things just break under WOT conditions."

Exactly why the "V shop" makes you sign a waiver, prior to dyno testing.
All kinds of **** is drug in there, with all kinds of issues. All wanting it dyno tuned.

 

Interesting, a trans. Is a little different from an engine. I really dont know what your gettting at here in terms to my question and logic placed behind it.
Now getting into detail with why they were so unprofessional. They never had me sign anything, they told me drop my car off on said date in april 14th?(it took 2 or 3 months im a busy guy i forget) once dropped off I had to ask if they needed my name or number for future reference for them. The car was ther for 3 weeks before i decided to call to see what was going on, they said they called but clearly i would have had a missed call. They then explained there was an issue with obd2, i told them to just fix it.
While i was researching o2 wiring i created a parasitic draw and ended up leaving them unpowered. My misunderstanding created a problem for them to tune it. I had them fix it.
Now i bought a brand new battery 1 month b4 dropping car off, not top shelf but far from bottom. This is because i had an old worn out wallmart battery in ther. After they fixed the o2 they finally tell me that they knew from the beggining the car had a parasitic draw. At this point im thinking i could have saved at least $1000 of a $1800 (that includes dyno and tune) bill because i either would have dug into it or just bought a pre made wiring harness online for $800.
Another week or 3 goes by so i call again they fixed it and had on dyno but now there was another 02 issue, that issue wasnt resolved till a last week. Even after all is fixed and engine knocking they kept telling me to get a pre made harness, why would i do that if they fixed the issue?
So now after this second o2 the bill is now $2200 and i coulda saves another $400. Im pissed i go in pay for the car tried my damdest to now be pissed. Ask what i need to kno and they say the w.o.t. and idle perf. Still need to be tuned it will only cost $175h should only take 2h. Is it just me or did i pay for not a full tune?
Not done im here looking at all the wire they fixed and it seems they only touched the power for the o2's and obd2, no other wires are touched even tho they said they placed 6h on figuring out the other o2 closed loop.
So, please. Is there any way the plug could have caused an issue idc what another shop did to another customers transmission.

P.s. sorry if thats really long and poorly typed its been a long and poor excuse of a shop and im in my garage tearing this bish apart p.o.

 

I forgot the part about the battery, they told me the battery was junk and needed to be replaced because it wasnt holding more than 7v. I took it to batteries plus and everything checked out perfectly. Bp wasnt goong to replace the battery under warrenty till i called the shop and they overheard my convo. So Bp was kind enough to replace it. The shop was going to charge me for removal and replace and an overpriced battery for no reason.

 

With that last part about the battery. Along with other stuff. How you paid for a tune but tell you it still needs tuning for another $350?

Seriously I'd try & find a better shop. Some of it sounds very close to an experience I've had at a "bad" shop. After having my car for way too long for the work done. I picked my car up & they told me to drive it easy & come back for the finish tune. When I brought it back the next thing I heard from them was that I lost a cylinder on the dyno. From cracked ring land. Thankfully someone from here got me to go to another shop & was right decision. Still hear bad stories come out of that place.

Good luck man.

 

When you state engine knock, are you talking about a knock that the sensors pick up or are you talking about a mechanical knock that can be heard like a rocker or something?

 

Got a video of the knock?

 

I had a misfire on cylinder 4 on my Silverado. I replaced the wire and plug. A couple months later, I was misfiring on the same cylinder. I took it to my regular mechanic. He found that the electrode ceramic was cracked in half. Probably a bad plug from the factory. No problems since then. Stuff happens at times.

 

I did not sign anything for my dyno tune at “V” shop, but your right, all kinds of junk gets put on those things. Dyno operator “mike” has told me all kinds of horror stories about dyno fails over there. Scary stuff.

 

What I was getting at is don’t always be so fast to blame a dyno operator or a shop for your misfortunes, but clearly you sir need to find a different shop. Your story is the typical “I got burned by my shop” story and unfortunately these types of stories are all over automotive forums. It’s a shame that you can’t trust people these days, which is why I do my own work.