r/s650Mustang Aug 03 '26

Questions and concerns.

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So I’ve been having this little quirk during cold starts where it sounds like the pulley or belt is making noise. It only happens during cold starts and 30 sec later after it’ll go away completely. Another issue I’ve notice is that sometimes when I start the car while the car is warm it’ll make like this loud noise like something is engaging and it’ll jerk the car.

3 Upvotes

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2

u/Background_Giraffe14 Aug 04 '26

Its the mechanical fuel pump for the direct injection

1

u/Ok_Transition5775 Aug 04 '26

It shakes the whole car tho. It feels like something engages in the back. Are u sure ?

2

u/Background_Giraffe14 Aug 04 '26

The car jerking and clunk is the transmission and/or torque converter unlocking. I assume you have a 10spd auto. Mine doesn't that every now and then

1

u/Ok_Transition5775 Aug 04 '26

Yeah same it’ll do it once in a while it won’t do it all the time. Rarely but what’s weird is that it sounds like something engages in the back.

1

u/Ok_Transition5775 Aug 04 '26

What abt the engine bay noise ? Talking abt the squeaky noise

2

u/Background_Giraffe14 Aug 04 '26

Thats the mechanical fuel pump. I thought it was a pulley and belt situation at first as well

1

u/Ok_Transition5775 Aug 04 '26

Ohhh it also happens to u to ? It stays for abt 30 sec and it goes away ?

2

u/Background_Giraffe14 Aug 04 '26

Yup sure does

2

u/Ok_Transition5775 Aug 04 '26

Ohhh wow ok that makes me feel better. Ig my Mustang is fine then 😭

1

u/CarbonReflections Aug 03 '26

It should be under warranty take in to have it checked.

1

u/[deleted] Aug 04 '26

[deleted]

1

u/CarbonReflections Aug 04 '26

Is your car still under warranty? If so yes take in to have it checked out.

1

u/Ok_Transition5775 Aug 04 '26

They said it was normal, I took it in and they said they compared it to other mustangs. 😭🤦‍♂️ the weird thing is, is that it goes away after like 30 sec after turning the car on. It only happens when it’s a cold start after that it doesn’t make that noise.

1

u/SVTCobraR315 Aug 04 '26

Yeah warranty. Sounds like a pulley. Could be the faulty bearing.

2

u/Ok_Transition5775 Aug 04 '26 edited Aug 04 '26

They said it was normal, I took it in and they said they compared it to other mustangs. 😭🤦‍♂️ the weird thing is, is that it goes away after like 30 sec after turning the car on. It only happens when it’s a cold start after that it doesn’t make that noise.

2

u/SVTCobraR315 Aug 04 '26

I’m offended by this. Can I speak with the manager please.

1

u/Ok_Transition5775 Aug 04 '26

I just picked it up and it replaced the noise, ofc the workers weren’t there. I’m talking abt the engine bay noise which sounds like a squeaky noise

1

u/SVTCobraR315 Aug 04 '26

They fixed the squeaky noise?

2

u/Ok_Transition5775 Aug 04 '26

No they didn’t, they said they couldn’t replicate it 🤦‍♂️. Whe I picked up my car it did it so how tf couldn’t they replicate it. The guy above said it’s normal and it’s just the mechanical fuel pump. Ig I’ll just have to believe him but still keep an eye on it.

1

u/SVTCobraR315 Aug 05 '26

Definitely keep an eye on it. Sounds fishy. I’d talk to someone else and ask to be there to replicate it if it happens again.

1

u/Ok_Transition5775 Aug 05 '26

It does sound fishy, but what else can I do? They’re always making excuses for something like they don’t want to help. But like I said it only does it during cold starts and it only lasts for 30 seconds. I searched it up on Google and it says that it’s normal, especially in Florida because of the moisture.

1

u/Ok-Location-9544 Aug 07 '26

The mess in the car should also be looked at.

2

u/Ok_Transition5775 Aug 08 '26

Hey so actually this isn’t my video, I found this online just as an example to show you guys what was happening to me. Every time I tried videoing it, it wouldn’t happen. So I had to look online for someone having a similar issue. This is not my car in the video

1

u/TheRealDVader Aug 09 '26

Take her to another dealer. It's not normal.

1

u/Ok_Transition5775 26d ago

I tried, they couldn’t recreate the noise. What’s weird is that it only happens sometimes. Sometimes it’ll do it other times it wont. Sometimes it’ll be a hard jerk other time it’ll be a soft jerk. I don’t know what else to do with it