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Old 08-18-2017, 03:09 AM   #1
ThinkPad
 
Drives: Yaris XP9 1.3 '06
Join Date: May 2016
Location: The Netherlands, Europe
Posts: 24
What is this rattling noise when flooring the gas pedal?

When driving around 70kmh/43mph (2000-2200rpm) in 5th gear and then flooring the gas pedal gives a rattle. I can easily recreate it in the 5th gear, but in 4th gear with rpm around 2000-2200 rpm also works.
I have made a video of it: https://youtu.be/Ga3pMcmMQEw (best to listen with headphones to hear it good). The sound is coming from the front/engine bay of the car.

It happens at:
0:04
0:14
0:23

Does anyone know what this is? I have checked the exhaust heatshield at the rear already, that one is not loose.
On this forum i found something about a TSB for the transmission cable, but that is for cars with automatic transmission. Have checked that cable on mine, but the shifter cables are very sturdy.

It is a Yaris 2006 with manual transmission and a 2SZ-FE engine.
I really hope it is not the timing chain...

Mileage is 118K kilometers / 73K miles

Someone said me that it could also be due to being in a too low gear for this speed and the sound is because the engine is protesting. Sounds reasonable (also because it doesn't pull that hard at that speed/gear), but that shouldn't bring such a loud noise i guess?

Edit: My girlfriend took it to the Toyota dealer, a mechanic had a drive with it. Conclusion is that it isn't anything critical. He thought it was something with the exhaust. He lifted the car and checked some things. He said it wasn't the timing chain. He thought it was something with building up pressure. As it only happens with low rpm in high gear i am reassured :)

Still interested in your answers though, as i haven't heared this on any other car i have driven, when driving low rpm in high gear. Usually the car justs begins to vibrate/hum a bit, but not rattle like this.
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Last edited by ThinkPad; 08-18-2017 at 07:34 AM.
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Old 08-18-2017, 06:09 PM   #2
IllusionX
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Maybe just an exhaust leak.

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Old 08-19-2017, 12:03 PM   #3
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Nope.

When covering the rear end of the exhaust with my hand, i don't hear any hissing so the exhaust is not leaking.
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Old 08-19-2017, 02:03 PM   #4
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If the front manifold donut gasket is wearing out, I doubt very much you would here a hiss while standing at the back. Right now, my money is on that gasket.

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Old 08-19-2017, 02:21 PM   #5
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Drives: 2007 2-door hatchback
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knocking?pinging? pre-ignition? detonation?

knocking?pinging? pre-ignition? detonation? (there's another word for it or something similar relating to problem w/ small displacement turbocharged vehicles.)
re: "rattling" in 5th
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Old 08-19-2017, 02:34 PM   #6
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Drives: Yaris XP9 1.3 '06
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Nah, engine runs fine otherwise.

I think the front donut gasket could be the issue after seeing examples on the forum how bad they could look.
The car is 11 years old, so i could imagine it has been eaten up a bit by the elements. Will have a look sometime when i have the car jacked up. It isn't that critical for now.
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Old 08-19-2017, 03:56 PM   #7
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pinging engine runs fine until it holes a piston
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