LS1 Engine Rattle

[Thirsty]

Maybe someone might be able to help me solve this one
http://i273.photobucket.com/albums/jj212/troy1979-photobucket/patrol/th_855124AB-35DF-413F-A001-FF20EC896085-2124-00000237FB049FFF_zpsf791cc0d.jpg (http://i273.photobucket.com/albums/jj212/troy1979-photobucket/patrol/855124AB-35DF-413F-A001-FF20EC896085-2124-00000237FB049FFF_zpsf791cc0d.mp4)

Cheers

[Thirsty]

Just incase the first link doesnt work
http://youtu.be/ywnWy6vk17A

[NissanGQ4.2]

Sorry I can't hear any rattles over the top of that awesome sounding motor :):):)

[Parksy]

Thats an interesting one. Does it do it when you only stab the throttle? The engine appears to move a lot, do you have an assistant to check for any contact/chaffing while you're on and off on the throttle?

[Thirsty]

It runs perfectly. It only happens in gear under a little to alot of load. you can free rev it and you will never hear it. The noise you hear is as long as it goes for, so its not continuous. It sounds like something is loose!!! If it was in the engine, surely the knock sensors would have picked it up??? If you accelerate while driving, what you hear on the clip is all you hear. I've just been told that it might be the starter ??? I have had an issue where the start will only click and thats it. But that hasnt happen for weeks now. My thought was the solenoid was sticking (hadn't been used for while and now its free'd up) Thoughts????

[Parksy]

So it's running an auto? Torque converter bolts torqued? If it only does it when in gear that would make you lean towards the transmission rather than the engine?

[Thirsty]

I recently torqued the torque converter bolts up with lock tight, but I will be checking them tomoz. The auto is shifting perfectly. it is actually running great all round except for this noise. I'll start triple checking all of my work tomoz.
Cheers

[NissanGQ4.2]

Not sure on the starter making the noise, but you might want to replace it anyway. Mine started clicking a few weeks back but only did it a few times, was a bit lazy to start and eventually gave up completely on the weekend.

[04OFF]

Piston slap Troy ?, was your donor car a "manual" gearboxed car by any chance, and how many Ks on the engine ?

How is cold starting, any noise after it starts ?

[Thirsty]

Auto. The same box is behind it except its been rebuilt. No noise at idle, no noise when cruising, no continuous noise when under load. It only happens briefly when you quickly tap the accelerator.

Cheers

[Thirsty]

Piston slap Troy ?, was your donor car a "manual" gearboxed car by any chance, and how many Ks on the engine ?

How is cold starting, any noise after it starts ?

Donor car did have 214 on it but it come up trumps with sump off inspection.

Cheers

[93patrol]

Maybe hydraulic lifters might be buggered as they make a rattle if knackered

[Alitis007]

To me the noise sounds like its pining buts thats normal when you give the motor a quick stab coz of the rush of air going into the motor. If you have had the ecu MAFless tuned the tuner will have to adjust the settings for the MAP sensor and TPS to react faster.

[Thirsty]

I pulled the starter out and have found some marks on the heat shields where the exhaust has rubbed them, so I'll modify them to rule them out. I'm sceptical in regards to it having something to do with the tune as it started about 30klms after the tune. But you never know! I have checked the torque converter bolts and they are tight. Process of elimination I think!!
Cheer for your input guys

[Thirsty]

Problem solved!!! It was the IAC Valve. It was dirty and sticking when the engine got hot. Cleaned it and the noise has gone.
Thanks for all your input guys, I appreciate it
Cheers
Troy