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Old Jun 9, 2025 | 03:19 PM
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He said they do
He said they do
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Old Jun 9, 2025 | 03:26 PM
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Ask what tests have they done with the scope…have him send you the waveforms they’ve taken.
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Old Jun 9, 2025 | 03:29 PM
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Originally Posted by C5 Diag
Ask what tests have they done with the scope…have him send you the waveforms they’ve taken.
I asked him, side note: they definitely know now I have another tech that’s helping me with seeing if they’re bull crap or not lol.
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Old Jun 9, 2025 | 03:32 PM
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Originally Posted by Jermbn
I asked him, side note: they definitely know now I have another tech that’s helping me with seeing if they’re bull crap or not lol.

Unless you can see proof that they’re using a scope I wouldn’t believe them.
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Old Jun 9, 2025 | 03:34 PM
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Originally Posted by C5 Diag
Unless you can see proof that they’re using a scope I wouldn’t believe them.
okay, I’ll keep posted on what they say, I check this forum for your reply, I also have pretty high following and have alot of friends with high following if they end up not working with me and telling me essentially to F off or something, I’ll be happy to give them a very very good review (messing up they’re business they get from all over the country)
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Old Jun 10, 2025 | 04:56 PM
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Originally Posted by C5 Diag
Unless you can see proof that they’re using a scope I wouldn’t believe them.
soooo they definitely aren’t using a scope, so far they said that they’ve switched coils around spark plugs around to see if that’s the issue, and he said his tech guy is working on my car every now and then… and he said he would work with me on the numbers, I asked him about like the diagnostic and how long it’s taking and stuff, from what I’m seeing my car isn’t super high priority to them they got like 1 guy working on it. And bro leaves early, and all they’ve done was “we switched coils around and tried everything really electrical to see if that’s the problem” but still no fix.
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Old Jun 10, 2025 | 05:00 PM
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Wow !!…diagnosing a misfire doesn’t take me longer than 2 hours at the most…that’s compression, fuel, spark and internal engine.
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Old Jun 10, 2025 | 05:04 PM
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Originally Posted by C5 Diag
Wow !!…diagnosing a misfire doesn’t take me longer than 2 hours at the most…that’s compression, fuel, spark and internal engine.
well I’m so confused what it could be genuinely, the car has been there since may 26th. I swear they just want to have cars in they’re driveway of the shop for show




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Old Jun 10, 2025 | 05:06 PM
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I’d tell them to just stick to the oil and brake changes…leave the diagnosing to a professional !!
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Old Jun 10, 2025 | 05:08 PM
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Originally Posted by C5 Diag
I’d tell them to just stick to the oil and brake changes…leave the diagnosing to a professional !!
they said they do more fixing than performance power making.. honestly I call bs. His guys are just deadass sitting around when I went back there. Talking numbers down when they try to charge me some big ole price
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Old Jun 12, 2025 | 02:22 PM
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Originally Posted by C5 Diag
Who is doing the diagnosis ??…a general repair shop or a dealership ??…as I’ve said a million times on this Forum those 2 types of shops do NOT have the diagnostic equipment to quickly and accurately diagnose a misfire…if they haven’t done so they will just start replacing parts…keep us informed !!
Dealers don't have the equipment to diagnose a misfire? What do they need that a dealership won't have?
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Old Jun 12, 2025 | 02:58 PM
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Originally Posted by Jermbn
He said they do
He said they do

A BORESCOPE is not an oscilloscope !!
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Old Jun 12, 2025 | 03:21 PM
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I took my ZL1 to Frankie to do headers, E50, and a tune. This guy is an absolute bullshitter. Same thing - kept my car forever and when I got it back it was just ******* horrible work. The price I paid for everything was nowhere near what we spoke about before I took it to him - and I even bought my own headers. It's like they let a kid work on my car. I'm doing pulls one night about to bust a scat packs *** and my car shuts off and all I smell is fuel. Left my flex fuel sensor fittings loose and just dumping fuel on my 1000 degree headers. I still don't know how my car didn't fireball that night, I was so ******* mad. Keep in mind this was my only mode of transportation, and I was driving back and forth to Louisiana at the time because my job requires me to go offshore sometimes. Could have really fucked me over, blew up my car, and left me stranded 6 hours from home because they were so careless. It gets better - later on, my boost gauge failed because that was installed **** poor as well. Brought it back for them to fix and he says I need to buy a whole new 600 P3 gauge setup - said he would order it and never got back with me. AND THEN later - randomly the car starts dying and sputtering under WOT. I start checking everything and what do you know - another installation error. They let the wires on the flex fuel sensor just rub against the plastic hood liner and over time just completely ate through it. Lazy ***** couldn't even put a zip tie to hold the flex fuel sensor in place. Then when I try to get them to fix it - he's over here bitching because I called his mechanic personally because I CAN'T LEAVE THE CAR for 7 ******* days while you dick around to fix a few wires. Just terrible at every step of the way. Do not give them any more of your money - take it somewhere else. Get it touch with Ryne Cunningham at BRC Raceworks. He just built my 19 Z06 and this guy REALLY is an expert on anything late model GM. - I'm never taking my vehicle anywhere else. He can get you fixed up and if you want to add power later that is where you go.

And honestly man if you need help getting there or picked up or whatever - PM me. I live around Pearland - I was young like you and that guy took advantage of me, so I feel for you, real piece of **** that just runs his mouth.
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Old Jun 12, 2025 | 03:29 PM
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Originally Posted by Gearhead Jim
Dealers don't have the equipment to diagnose a misfire? What do they need that a dealership won't have?
Dealers do NOT use the advanced diagnostic equipment needed to quickly and accurately diagnose a misfire ...they need a DSO...Digital Storage Oscilloscope which we call a labscope...dealerships only replace parts and if it is something that may be internal to the engine like say a worn cam lobe they will only guess since the engine must be torn down and that will be expensive...in a few minutes I can put my pressure transducer into that spark plug hole and run the car and interpret the waveform below...I can tell if a timing chain has skipped a tooth, a clogged cat, a worn cam lobe, a valve that is either stuck open or closed or leaking, and if I put connect this transducer into the oil dipstick I can tell if the rings are bad...yes, you can do a leak down test but this is faster...I don't have to turn the engine over to find TDC...with a labscope I can do a "relative compression" test in 2 minutes vs. 2 hours that it will take to remove all the plugs and use a gauge...that is the other waveform below....video below of how the best diagnostic tech and instructor in the country finds a misfire.











Last edited by C5 Diag; Jun 12, 2025 at 04:06 PM.
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Old Jun 12, 2025 | 05:21 PM
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^^^^^
Thanks.
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Old Jun 12, 2025 | 06:38 PM
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^^^ C5 Diag, wow, that's a level of automotive diagnostics I have never seen before. Really eye opening. Thanks for posting that video. Fricken straight up scientific.
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Old Jun 12, 2025 | 06:52 PM
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Originally Posted by Zjoe6
^^^ C5 Diag, wow, that's a level of automotive diagnostics I have never seen before. Really eye opening. Thanks for posting that video. Fricken straight up scientific.
This level has been around for 20 years…unfortunately 99.999% of mechanics don’t have this level of expertise or the equipment necessary to perform it….the gentleman in the video named Bernie Thompson is the father of incylinder pressure analysis…his company ATS Solutions in Albuquerque NM designs and manufactures the type of equipment seen in the video…that 8 channel scope and scan tool is around $12,000.




Last edited by C5 Diag; Jun 12, 2025 at 07:00 PM.
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Old Jun 13, 2025 | 09:40 AM
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Originally Posted by C5 Diag
This level has been around for 20 years…unfortunately 99.999% of mechanics don’t have this level of expertise or the equipment necessary to perform it….the gentleman in the video named Bernie Thompson is the father of incylinder pressure analysis…his company ATS Solutions in Albuquerque NM designs and manufactures the type of equipment seen in the video…that 8 channel scope and scan tool is around $12,000.



https://youtu.be/811OPlwP7lc?si=EyJdEzp-Cb1UjwkU

quick question, I ordered long tube headers, maybe a while ago and I was thinking about replacing them on my own, I have straight all Milwaukee power tools and I have like 2 friends that’s helping me out with it, I’m wondering is it just making room to get to the bolts by taking out fuse box on c7 on passenger side and some things on driver side then coils and spark plugs and then unscrewing the header bolts? Then after wards the rest from bottom and pull out? I have also an off road x pipe coming with those long tubes so it wouldn’t necessarily be open headers it would exit out however long the pipe is. And I have band clamps, just trying to save money instead of paying 600$ when I got the tools for it.
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Old Jun 13, 2025 | 09:43 AM
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Originally Posted by Jermbn
quick question, I ordered long tube headers, maybe a while ago and I was thinking about replacing them on my own, I have straight all Milwaukee power tools and I have like 2 friends that’s helping me out with it, I’m wondering is it just making room to get to the bolts by taking out fuse box on c7 on passenger side and some things on driver side then coils and spark plugs and then unscrewing the header bolts? Then after wards the rest from bottom and pull out? I have also an off road x pipe coming with those long tubes so it wouldn’t necessarily be open headers it would exit out however long the pipe is. And I have band clamps, just trying to save money instead of paying 600$ when I got the tools for it.

Couldn’t tell you !!
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Old Jun 13, 2025 | 09:44 AM
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Originally Posted by C5 Diag
Couldn’t tell you !!
dang, do you work on cars at a shop? If so could I bring my car to you if this shop is not good? I’m in Texas but I don’t mind delivering it to you if it’s making the car healthy.
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