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My 2004 d-cab v6 has start-up noise when the engine is cold. It sounds like a knock and speeds up with the throttle. The noise goes away when the engine warms up. I'm using Mobil one 5w30 but I'm going to try 10w30 to see if it helps. When you listen under the hood the noise is all but gone but it can be heard from under the truck around the convertor.???????????????????????? :confused:
 

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A bit late on the reply...My truck also makes a ticking (piston slap) sound at start up. The V6 now has 32,000 miles with the sound first appearing at 21,000 miles (with oil changes at least every 3,000 miles). The engine also has what I believe to be loud valve train noise that peaks at around 3,000 rpm, although, my valves are within Toyota's tollerences. From what I've learned switching to a 10w30 would be the wrong choice. The thinner 5w30 oil is better in the winter than the 10w30, so I would stick with that or if its really cold where you live go to a 0w30 (however, the greater the difference in the numbers the greater the additives and supposedly the lower overall oil quality).

I've been told both of these annoying sounds are normal but I've been doing everything I can to eliminate them, including getting Toyota and the dealers to step up to the warrenty plate. Anyway, I have found one thing that has helped with the cold engine start noise and that is to run BG44 with a tank of gas then changing the oil. I read a post about how clogged fuel injectors will leak over night and when the engine is started for the first time there is a slapping sound due to the accumulated fuel. Whether this is true or not after running BG44 and changing the oil the cold start up sound is much less frequent. The weird thing is that I also get the start up sound when the egine is really hot. For instance after driving for a long time on the freeway and starting up after a 5 minutes rest stop the engine will consistantly make the piston slap sound and I dare not drive it for a few minutes. Has this happened with your truck?
 

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mines got 22,000 and it has done it ever since about 10,000 as is said to be normal.

Sam
 

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my truck was also making a clicking noise at start up and idle I thought it was something major but it turned out to be noisy belts. I put some belt dressing on them and the noise went away. Maybe the same noise but probably not. Just adding my 2cents
 

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This is the only thread I have found that matchs what I hear from my engine. I dont mind it except when the windows are closed and the radio is off. I bought my taco with 13,000 miles and now have 22,000 miles with mobil 1 5w30. Truck runs great but ticking at 1500 to 3000 rpms only loud when cold.
 

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I have had 3 Taco's w/3.4 engines with absolutely no noises at all.I would have to say that any abnormal nioses would not be considered normal...In fact i have never heard a 3.4 that sounded bad ever!
 

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Hey Dude
I have an 08 FJ that I've been trying to track down a very similar sound.
I think I've narrowed it down to either fuel line or brake line pulsing.
I know this sounds weird but I do think thats it.
The dealer is no help,of course they dont hear it!
My noise seems to come from right under driver side foot well area,cant be heard from under the hood.when I crawled under the other day I found a bunch of lines all in clips right about where I hear the noise.
I'm still working on solving this one.
Good luck.steve
 
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