THIS IS NOT A LIGHT READ:
It's not my most elegant post, and it contains a tonne of info. If you want to comment or argue, please have a look at what I've dug up first. That being said, many of you know this engine better than I do, and I look forward to your opinion.
Here is my opinion.
I have had this issue for some time now. Here are the results of my research:
This has been going on for a while, but seeing as my clutch exploded last night and the truck is a massive paperweight, I might as well try to fix this issue at the same time.
When the truck sits for about 4 hours or more, the start up sounds bad. Likes valves flapping or something. I think it is due to poor oil pressure.
Maybe I need a new pump? Engine is losing prime? Any ideas?
The longer it sits, the longer it makes the nasty sound when starting. Always goes away after 1-2 seconds. I think this is how long it takes to build oil pressure...
I have tried new filters. Thought maybe bad anti drain back valves. Nope.
I really don't know... but I'm tempted just to tear the motor out and have a good look at everything. Can't drive the damn thing now anyway...
My labor is free to me. A new clutch and bell housing... not so much.
So I give you... NAME THAT SOUND: FJ EDITION!
FJ Cruiser Hard Start Up Sound - YouTube
FJ Cruiser Hard Start Up Sound - YouTube
The original thread: https://www.fjcruiserforums.com/forum...-rumble-4.html
FJ's are not the only vehicles with this problem:
Rav 4's have it: VVT Cold Start Video - Toyota RAV4 Forums : RAV4World.com
Rav 4's have a TSB for it
: TSB 0146-10 up date/watch out! - Toyota RAV4 Forums : RAV4World.com
Camrys, Highlanders, and Venza's also have it: Toyota Technical Service Bulletin Index
Brief Engine Knock/Rattle Noise at Cold Startup (1AR/2AR) Brief Engine Knock/Rattle Noise at Cold Startup (TSB-0146-10)
Immediately following a cold soak startup, some 2010 – 2011 Camry, 2009 – 2010 Highlander, 2009 – 2010 RAV4, 2009 – 2010 Venza model year vehicles equipped with the 1AR-FE and 2AR-FE engines may exhibit a brief knock/rattle noise from the engine compartment for approximately one second.
Toyota put a "lock pin" on 2010 plus Fj's to prevent this on the new 1GR-FE engines, which also have this system on the exhaust now (2009 FJ's and older only have it on intake): http://www.google.ca/url?sa=t&rct=j&...58187178,d.cGU
36 FJ CRUISER - NEW FEATURES
a. VVT-i Controller
The VVT-i controller consists of an outer housing that is driven by the timing chain sprocket, and
a vane sub-assembly that is coupled to each camshaft.
The intake side uses a VVT-i controller with 3 vanes, and the exhaust side has used one with 4 vanes.
When the engine stops, the VVT-i controller (intake) is locked at the most retarded angle by its lock
pin, and the VVT-i controller (exhaust) is locked at the most advanced angle. This ensures excellent
The oil pressure sent from the advance or retard side passages of the intake and exhaust camshafts
causes rotation of the VVT-i controller vane sub-assembly relative to the timing chain sprocket, to
vary the valve timing continuously.
An advance assist spring is provided on the VVT-i controller (exhaust). This helps to apply torque
in the advanced angle direction so that the vane lock pin securely engages with the housing when
the engine stops.
Full article detailing all changes between the 2009 and 2010 FJ motor:
Some have suggested a 0W20 oil will get there faster in cold weather:
When cold, a 0W20 will pump up to the bearing surfaces faster than a 5W30.
My FJ is not the only FJ to do this:
So basically, I want my VVT-i cam gears/VVT-i controller replaced under a TSB. Does this TSB exist? Toyota has acknowledged a design issue on other platforms with VVT-i, and have revised this 5 times based on some of the sources above.
I can band-aid this with a $200 pre-lube system, which will store oil pressure in an accumulator until I hit the starter, providing instant oil pressure (see my original thread if you want more info on the oil pressure light, cranking with the EFI relay pulled, etc).
Engine Pre Lube System Insta-Lube Kit Description
I am happy to be at the bottom of this, and the 2nd gen 1GR-FE now makes more sense and is more appealing, even if I don't like the oil filter. :P
I could be wrong, but I've researched this to death, with more info I found and couldn't bother to document. There are youtube videos of this happening to Toyota diesels as well!
Who else has this? Obviously not 2010+ FJ's...
Happy to be driving my FJ again (finished the new clutch, flywheel, and PDM Tranquil throwout bearing kit last week), but I want quieter starts!!!