2019 Mustang GT Spark Knock Data Log Help

[epicmilky]

You're getting a good amount of knock. You could buy a datalogger/tuner and log some runs and then submit them to a tuner to see what they think would be causing it and then get a tune.
Most dealers wont go that deep unless theres a CEL. And even with warranty youre lucky to get anything done, and or done correctly.

That is definitely worth considering, might be the next step after I let the ford service department jerk me around some more during this next appointment. After the appointment on September 2nd, depending on what they say, I'll probably see what happens with octane booster and a tank of 93. However, I am getting close to saying screw it and just trade it in and let the dealership deal with it. This Is my third Mustang and I’ve hadn’t had too many issues with the other two and when there were issues, they were resolved pretty quickly.

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[epicmilky]

I'd get an extended warranty wait a month and 1000 miles then try to blow it up.

I see some tip in knock in my logs but never hear it.

Any suggestions on companies to get an extended warranty from? Don't know if I'll do it, but something to consider.

 

[epicmilky]

If he's getting high knock retard on wot it will blow itself up eventually for him, lol.

Personally I think there's a mechanical issue going on here. I'm curious what all the cylinders look like on a scope and what the compression numbers are

I'm hoping I can get the service department to scope the cylinders, but they aren't going to do anything unless the engineer tells them to, so we will see.

 

[K4fxd]

I'd call Granger Ford but the company would probably deny engine coverage due to it being a pre existing condition. Ask the service manager if the engine is still covered and if he says it is get it in writing.

It shouldn't have audible knock, even on 87. Except for once in a blue moon stuff.

 

[epicmilky]

I've been meaning to provide an update on this adventure.

I finally got my car into the dealership service department on September 3rd and they were willing to look deeper into this issue this time rather than just explain it away. Very quickly they found that my number 2 cylinder wasn't looking great and some evidence of coolant being burned. Then they noticed my coolant was very low (not low enough for me to see any temp issues though). They confirmed the coolant had a leak and suspected it was leaking into the number 2 cylinder. Later they confirmed this was the case and determined the cylinder head had to be replaced.

They submitted everything to Ford for warranty because even though my warranty ended in August, the issue predated the expiration and there was a lot of documentation of that. After some stonewalling from Ford, we finally got their offer and they weren't willing to cover all of the cost. The total repair will be around 4,000 and Ford is only willing to cover about 1,800. They simply did not care that the issue was going on well before the expiration of the warranty or that I was trying my damnedest to get the issue addressed. They only cared that by the time the work started on the car, it was out of warranty. They even said them offering any money was them being extremely generous.

Luckily, the dealership is going to cover most of the remaining cost (as they should for stringing me along for months until my warranty expired). It'll end up costing me $200 and I've been driving a dealership loaner for the last two weeks. My car should be finished by late next week.

 

[ice445]

I've been meaning to provide an update on this adventure.

I finally got my car into the dealership service department on September 3rd and they were willing to look deeper into this issue this time rather than just explain it away. Very quickly they found that my number 2 cylinder wasn't looking great and some evidence of coolant being burned. Then they noticed my coolant was very low (not low enough for me to see any temp issues though). They confirmed the coolant had a leak and suspected it was leaking into the number 2 cylinder. Later they confirmed this was the case and determined the cylinder head had to be replaced.

They submitted everything to Ford for warranty because even though my warranty ended in August, the issue predated the expiration and there was a lot of documentation of that. After some stonewalling from Ford, we finally got their offer and they weren't willing to cover all of the cost. The total repair will be around 4,000 and Ford is only willing to cover about 1,800. They simply did not care that the issue was going on well before the expiration of the warranty or that I was trying my damnedest to get the issue addressed. They only cared that by the time the work started on the car, it was out of warranty. They even said them offering any money was them being extremely generous.

Luckily, the dealership is going to cover most of the remaining cost (as they should for stringing me along for months until my warranty expired). It'll end up costing me $200 and I've been driving a dealership loaner for the last two weeks. My car should be finished by late next week.

Interesting. Head gasket or head issues aren't very common on the 5.0. I also don't see how a slight coolant ingress would lead to audible knock, so I'm not convinced the two issues are related. I'm curious how low the coolant level was, since it seems common for these cars to mysteriously lower to the "min" line and then sit there indefinitely. But if the res was empty then sure, you're losing it somewhere.

 

[epicmilky]

Interesting. Head gasket or head issues aren't very common on the 5.0. I also don't see how a slight coolant ingress would lead to audible knock, so I'm not convinced the two issues are related. I'm curious how low the coolant level was, since it seems common for these cars to mysteriously lower to the "min" line and then sit there indefinitely. But if the res was empty then sure, you're losing it somewhere.

They didn't tell me how low exactly the coolant level was but they stated it was really low. Also, the card was serviced less than 6 months prior and they talked to the tech that serviced my car and he claimed that the level was good at that time. When they did a pressure test, I think they said it lost a few PSI over a couple of hours.

I suspect that I've had this leak for a very long time and it's just been getting worse. Back in 2021 when I first brought my car in for the spark knock, I also noted that the vehicle would occasionally spit out thick white smoke on startup. Because that issue was so rare and inconsistent, they couldn't duplicate it and wouldn't look into it. I found out that white smoke like that can indicate coolant burning. I have also seen online that a symptom of coolant leaking into the cylinder is spark knock.

Ultimately I'm not 100% sure this is going to fix the overall issue which is why I'm planning on trading it in a getting a new Mustang.

 

[ice445]

They didn't tell me how low exactly the coolant level was but they stated it was really low. Also, the card was serviced less than 6 months prior and they talked to the tech that serviced my car and he claimed that the level was good at that time. When they did a pressure test, I think they said it lost a few PSI over a couple of hours.

I suspect that I've had this leak for a very long time and it's just been getting worse. Back in 2021 when I first brought my car in for the spark knock, I also noted that the vehicle would occasionally spit out thick white smoke on startup. Because that issue was so rare and inconsistent, they couldn't duplicate it and wouldn't look into it. I found out that white smoke like that can indicate coolant burning. I have also seen online that a symptom of coolant leaking into the cylinder is spark knock.

Ultimately I'm not 100% sure this is going to fix the overall issue which is why I'm planning on trading it in a getting a new Mustang.

Sounds like it could be the issue then. A shame you have to pay so much out of pocket though.

 

[epicmilky]

Sounds like it could be the issue then. A shame you have to pay so much out of pocket though.

Yeah. Ford definitely is a piece of garbage, but the dealership is stepping up in a large way to fix their screw-up.

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