Strange startup noise?

[tucker74]

My FZJ's been making a strange noise on cold startups - kinda like a "bruunnnt" lasting less than a second right after firing, and only when the ambient temp is below 60 or so. I don't know where to start - the belts have less than 6k on them and it doesn't "sound" like the starter. I'm not sure though - this truck has an aftermarket starter so I haven’t done the contacts/plunger. Anyone come across something similar?

Tucker

 

[KliersLC]

Is it a rattle? Or could it be described as a valve train noise? If so, search for startup rattle to find out a bunch, but it is solved by the newer toyota filter and if you want, a higher viscosity oil.
Good luck,
Dan

 

[tucker74]

Doesn't sound like valve tap ... using 15W-50 M1 and Purolator PureOne so it's pretty unlikely. More like a screaching/grinding sound ... but not starter (or what I've heard from 1FZ starter in the past).

Anyone else?

Tucker

 

[Beowulf]

Could be the chain tensioner not pumping up quickly and you're getting some slap on the cover. Might also be a busted chain guide.

-B-

 

[tucker74]

That doesn't sound good Anybody else seen this? Better get out the stethoscope ...

Tucker