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GR86, 2017 Mustang GT PP1
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Discussion Starter · #1 ·
I was on my way home from work last night, and going up the on ramp getting onto the highway, the engine briefly died. I'm not sure what my speed was at the time, maybe 40 or 50 mph. I saw a red box on the dash below the speedo or tach (I'm not sure which) light up.

I had just enough time to think, "oh s$#$!" It was cold, in the upper teens yesterday afternoon and I really didn't want to spend a lot of time outside or in a non-functional car. And then the engine started running again and it was flawless the rest of the way home.

I didn't see a check engine light come on. I didn't have time to depress the clutch pedal. Or do anything else. Basically I lost power, looked down at the dash and then power came back and I cautiously continued driving.

I recently had my second dealer oil change, so when I got home I opened the hood and checked oil and just generally looked around the engine compartment. Oil level is fine and there wasn't anything else I saw that looked out of place.

My assumption is that the car has a flaw in the electrical harness. There was a brief loss of connection between two critical components that caused the ignition to malfunction for a short amount of time. The disconnection must have been brief enough that the ECU was continuing to try to run the engine, and since the momentum of the car kept the engine turning - once the connection was restored, the ignition resumed firing and the engine started running again as though nothing had happened.

I didn't get a backfire or anything, so it's possible that no raw fuel was dumped down the exhaust. However, I had only run the engine for a few minutes at the time this occurred, so it's possible that any extra fuel just burned off gradually.

Anyone else have something like this happen to them? What was the resolution, if any? I think I will call the dealership, but since there was no check engine light I'm not sure whether a code would have been set.
 

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I was on my way home from work last night, and going up the on ramp getting onto the highway, the engine briefly died. I'm not sure what my speed was at the time, maybe 40 or 50 mph. I saw a red box on the dash below the speedo or tach (I'm not sure which) light up.

I had just enough time to think, "oh s$#$!" It was cold, in the upper teens yesterday afternoon and I really didn't want to spend a lot of time outside or in a non-functional car. And then the engine started running again and it was flawless the rest of the way home.

I didn't see a check engine light come on. I didn't have time to depress the clutch pedal. Or do anything else. Basically I lost power, looked down at the dash and then power came back and I cautiously continued driving.

I recently had my second dealer oil change, so when I got home I opened the hood and checked oil and just generally looked around the engine compartment. Oil level is fine and there wasn't anything else I saw that looked out of place.

My assumption is that the car has a flaw in the electrical harness. There was a brief loss of connection between two critical components that caused the ignition to malfunction for a short amount of time. The disconnection must have been brief enough that the ECU was continuing to try to run the engine, and since the momentum of the car kept the engine turning - once the connection was restored, the ignition resumed firing and the engine started running again as though nothing had happened.

I didn't get a backfire or anything, so it's possible that no raw fuel was dumped down the exhaust. However, I had only run the engine for a few minutes at the time this occurred, so it's possible that any extra fuel just burned off gradually.

Anyone else have something like this happen to them? What was the resolution, if any? I think I will call the dealership, but since there was no check engine light I'm not sure whether a code would have been set.
This is concerning. Following
 

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2022 Ice Silver BRZ Limited manual.
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3,504 Posts
Crazy. 1st ive heard of anything like this on a gen 2. Definitely sounds like an electrical issue. My guess.... Bad ground.
 

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2022 Ice Silver BRZ Limited manual.
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3,504 Posts
Might even show up in your phone app.
 
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GR86, 2017 Mustang GT PP1
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Discussion Starter · #10 ·
Crazy. 1st ive heard of anything like this on a gen 2. Definitely sounds like an electrical issue. My guess.... Bad ground.
I like that guess. This is the kind of thing I also associate with a bad ground.

I would suspect loose ground point or a harness not fully seated… especially since it was cold out.
I'm hoping there will be an easy fix and based on the symptoms they will have a short list of things to check.

Also, the dealer can hook it up to Techstream and it will show what failed. Trust me, the car logs all sorts of errors for the various systems, not just codes for check engine.
I hope you are right. I really don't want to take it in and hear that they can't find anything wrong.
 

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2022 BRZ Limited WRB
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635 Posts
My E46 did the same thing on me. It’s usually nothing huge but it is annoying to chase down.

Id start with checking the battery terminals and the battery ground strap, wherever it goes on these cars. From there, check your engine ground strap, probably somewhere on the underside of the “block”. If it isn’t that, take it to the dealer because pulling the fuses to check for any incorrect resistances is obnoxious, lol.
 

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GR86, 2017 Mustang GT PP1
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Discussion Starter · #12 ·
My E46 did the same thing on me. It’s usually nothing huge but it is annoying to chase down.

Id start with checking the battery terminals and the battery ground strap, wherever it goes on these cars. From there, check your engine ground strap, probably somewhere on the underside of the “block”. If it isn’t that, take it to the dealer because pulling the fuses to check for any incorrect resistances is obnoxious, lol.
You're right, I should at least do the super simple and easy checks like the battery terminals and anything I can easily reach from above.
 

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GR86, 2017 Mustang GT PP1
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Discussion Starter · #14 ·
Well - the dealership mechanic said that there were no codes stored. He looked the car over and didn't see anything obviously wrong. So for now I will just cross my fingers that this doesn't happen again.
 
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