Strange sound when starting up.

[L3V3L1]

Any ideas what this honk sound is? I hear it occasionally on cold starts.
Thanks
https://youtu.be/3jA4UmaXnMo

[Michael]

Make sure the compressor is not engaged so you can rule that out.

I'm hearing a knocking noise and/or grinding. Possibly starter gear not disengaging or a bolt backed out of flywheel barely hitting engine block.

[Bitsyncmaster]

If it's repeatable, you can try unplugging the idle ECU and or the FV and see if it stops. Do you step on the gas to start it? Does it do it with a cold and hot engine?

[DMC-81]

Make sure the compressor is not engaged so you can rule that out.

I'm hearing a knocking noise and/or grinding. Possibly starter gear not disengaging or a bolt backed out of flywheel barely hitting engine block.

+1

[Giamanut]

Make sure the compressor is not engaged so you can rule that out.

I'm hearing a knocking noise and/or grinding. Possibly starter gear not disengaging or a bolt backed out of flywheel barely hitting engine block.

+2 all day long. bad tooth on starter so it bangs flywheel then grinds. Just my opinion.