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Old 07-16-2015, 04:04 PM   #1
LittleM@n
 
Drives: Yaris
Join Date: Mar 2015
Location: EE
Posts: 25
Strange engine noise (pinging/ticking/rattling)

Hello,

I have some strange issue with my 1NZ-FE Yaris TS rebuild engine.
First, some introduction: The engine has been rebuild with low compression 9.0:1 Arias forged pistons and Molnar rods, and I've put about 2300km on it.
The timing chain kit is new, vvt-i sprocket is new, water pump and oil pump are new, thermostat is new, new full set of gaskets, new filters, new sparkplugs, the cylinder head has been rebuild to factory specs.
The block was honed to 75.5mm.

First 300km I drove with Amsoil 30W brake-in oil. After this, I used Toyota OEM 5W30 oil.

The issue is that in the past 2 weeks become more hotter outside (about +35 degrees celsius medium, sometimes almost to 40), and I started hearing some strange high pitch rattling, like some loosen nuts and screws on a sheet of metal (or some rocks in a can if you may). The issue is that the noise is not constant, and appears at light load, parked or in gear (doesn't matter which), at around 1800-2000rpm. Appears and disappears.
Because it didn't bother me too much, as since from the beginning it made a strange ticking noise on idle, around the third cylinder, and the mechanic told me that it's very probably an injector, and I believed it was the same noise, I drove it a little more revved with some 5-6000rpm tops once or twice.
After this session the noise is quite easy to reproduce in the area of 1800 to under 2000rpm, when keeping the engine at this speed. It rattles (like pinging/ringing) and is quite loud on the inside and outside. It goes away at 2000, and comes back between 2400 and slowly disappears as you go up to 2800.
And since listening to it a lot, I start to believe that the ticking noise from the idle is still the same, just that is a little bit lower pitched and it could fool you that it's an injector.

When the engine is cold it sounds just right, nothing strange. As soon as it warms up (2-5 minutes in the current weather) it starts to rattle at that certain rpms.

Any ideas what it could be? I checked the engine bay and nothing is moving or is loosen (screw, exhaust heat shield, etc).


Thanks!
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