Clunk upon start

[JJLbkl]

Has anyone experienced an audible "clunk" sound upon starting. This happens sometimes when cold but more often when warm. Today it was very loud and sounded like it came from the rear of the vehicle. It is definitely not cam phaser, as i have heard that and had it replaced.

 

[mikehawncho]

My ‘19 makes a sound very similar to the one you’re describing. I haven’t been able to figure it out yet either.

 

[GPS]

My '19 does on cold start. Clearly come from the front.
Anyone can help?

 

[SpeedRaptor]

Watching...
Mine has done this as well.

 

[skidmarcx]

I’ve heard mine clunk twice since I bought it a month ago, warm start only and definitely was from the engine area, I suspect phaser but it’s a guess

17’ with now 29k miles, Carfax shows it had a reflash already for the rattle, but no hard parts replaced yet.

 

[PorterW1111]

Gen1 used to do this as well. Maybe 3-5 secs upon starting. I assumed it was something to do with the a/c compressor clutch engaging, or maybe the thermostat opening, or maybe even the fans turning on, to maybe even Something with the fuel pump.

 

[FordTechOne]

I’ve heard mine clunk twice since I bought it a month ago, warm start only and definitely was from the engine area, I suspect phaser but it’s a guess

17’ with now 29k miles, Carfax shows it had a reflash already for the rattle, but no hard parts replaced yet.

Phasers don’t clunk. Sounds like it may be the normal sound of the starter drive gear retracting.

 

[1BAD454SSv2]

Driveline clunks on start up when your on level ground vs. parked on incline.

 

[skidmarcx]

Phasers don’t clunk. Sounds like it may be the normal sound of the starter drive gear retracting.

I had a 17’ in my shop for phasers, 80k miles on it, one of the phasers had a sheared pin causing the cam to make a loud clunk when you rotate the engine over, reminded me of that