Coyote Gen3 cold start engine sound analysis (Mach 1)

[DrewT]

Sounds pretty normal to me. The pop/click sound is a little different than anything I've noticed but doesn't sound worrisome to my layman's ear.

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[murick]

@Tucker80 @Hack @PoCoBob @DrewT @Cux211
Thanks guys for all the replies. I guess I must have sounded a bit paranoid, but the truth is that I really do not know, what is the normal sound (at the cold start) and I am genuinely curious about what causes the different sounds and why. I am a bit worried about the popping sounds because it is irregular, but it could as well be normal for this type of engine.
I definitely did not want frame the question as I am scared to start my car because of all these strange sounds it makes .

I agree with what many suggested - the car is new, and if it sounds like that the chances are it is perfectly normal and I should not worry. If something really happens I can still apply the warranty and have a Ford dealer fix it (though it may not be that straightforward here).

I might still want to understand it though

 

[murick]

cockchafer sounds like a phallic themed limo driver

Yeah, I know it is funny name and truth is I could not find better words to describe it while having enough confidence that it is understood the way I expect it.

I know you meant it as a joke, but you might be surprised how difficult is it to describe a particular sound for a non native speaker with no real life experience.

For example in the other thread people discuss 2k rattle. Despite the word "rattle" being well defined in the vocabulary and me being able to understand that definition, I have no idea what it does mean in the context of Mustang or V8 NA engine, so even if you ask me if I ever heard it, I would have no idea. And when I listen to recordings people post about this I typically cannot identify it either .

 

[skinnyb]

I have learned a long time ago that the Coyote engine is a noisy beast. I had an F150 with the Gen 3 Coyote and it made all kinds of clicks and rattles. I drove it over 100K miles and it never got any worse or better. My Mustang is a little quiter but still makes similar noises. That random mettallic chatter is the only thing that sounds a little odd to me, the rest is just injector noise. I do treat mine with Liquimoly Ceratec to help keep the noises to a minimum. I say just drive it and enjoy and if something blows up, you got a warranty for that.

 

[Hack]

@Tucker80 @Hack @PoCoBob @DrewT @Cux211
Thanks guys for all the replies. I guess I must have sounded a bit paranoid, but the truth is that I really do not know, what is the normal sound (at the cold start) and I am genuinely curious about what causes the different sounds and why. I am a bit worried about the popping sounds because it is irregular, but it could as well be normal for this type of engine.
I definitely did not want frame the question as I am scared to start my car because of all these strange sounds it makes .

I agree with what many suggested - the car is new, and if it sounds like that the chances are it is perfectly normal and I should not worry. If something really happens I can still apply the warranty and have a Ford dealer fix it (though it may not be that straightforward here).

I might still want to understand it though

I completely understand being curious and wanting to know what makes the noises. I doubt your dealer mechanic will know for sure what each noise is either. And if he says he knows he's probably confident about a lot of other somewhat questionable things.

I suppose you could purchase a mechanic's stethoscope or use a screwdriver or other long metallic object to narrow down where each noise is coming from. Chain noise is probably an easier thing to identify because it's constant. Things like evap purges, camshaft phaser movements, port injectors, DI injectors, DI high pressure pump, etc. might not be running all the time, so you probably would hear only occasional noises from many of them, which would make them tougher to identify.

I guess I'm lazy so I know there are noises, but I don't care to take the time or effort to identify them. I would spend that time doing something else. I'd like to think something productive, but maybe just reading Mustang forums or something.

 

[murick]

Today when picking up my car at the dealer, where it was for a different repair, but I asked them to check the cold start as well, they confirmed that it sounded the same as the other Mustangs in the dealership they tried. So nothing to worry about.

However, I would still like to understand from where or from what those sounds come.

 

[SheepDog]

Today when picking up my car at the dealer, where it was for a different repair, but I asked them to check the cold start as well, they confirmed that it sounded the same as the other Mustangs in the dealership they tried. So nothing to worry about.

However, I would still like to understand from where or from what those sounds come.

Get yourself an automotive stethoscope. Probe each area of the engine slowly, and try to pinpoint the sounds. Be really careful with this thing, even slight noises are loud as shit through it, and can hurt your ears if you aren't carful

I hear the normal sounds of Direct injection, and lifters ticking

The intermittent chirping sounds like a pulley or maybe a belt issue, but could also be coming from the HPFP

The rattle that starts at :50 sounds like a cam phaser not "phasing" correctly, and potentially the timing chain has slack in it due to this. There was someone else on here that had the same sound, although louder and it was the phaser.

 

[furdfan2018]

Today when picking up my car at the dealer, where it was for a different repair, but I asked them to check the cold start as well, they confirmed that it sounded the same as the other Mustangs in the dealership they tried. So nothing to worry about.

However, I would still like to understand from where or from what those sounds come.

The rattling from 0 seconds to 30 seconds is pistons rattling in their bores until they expand a little bit and take up more space. This is an inherent noise in the gen 3 coyote.

The ticking is cam phasers and a little high pressure fuel pump.


Just run it and beat the snot out of it once she's at operating temp. Nothing to worry about.

 

[21M5033]

So did we establish this “chirping” noise coming from what we believe is the car phaser between about 50 seconds in and then goes away at 2 minutes is a pretty normal noise for coyotes? Mine is doing the same exact thing.

 

[luca1290]

Your engine sounds perfectly normal. Revving higher for the first couple of minutes is due to the emissions regulations for heating up the catalytic converters.

The different tone of the engine in the first 30 seconds (or so) is common in petrol engines, also my Merc does it, as well as the GT. Although I know the basics (at cold starts the ECU boosts the quantity of fuel and air) I've never been able to pinpoint which valve opens (and suddenly closes after 30 seconds) during cold starts.

I suspect is the purge valve in the EVAP system but I've never monitored the ECU to confirm that.

 

[Saabeh]

I wanted to revive this thread with my own experience. My 15k mile gen 3 coyote started making an identical noise to the OP's audio clip at 0:34. One bottle of Ceratec cured it after one drive. I could not believe it. I'll likely run one bottle every oil change going forward.

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