Clicking Noise coming from Valves
02-20-06, 10:41 AM
#1
Pole Position
Thread Starter
Clicking Noise coming from Valves
I was trying to disable the DRL's yesterday, when I noticed how loud the valves are. A clicking noise, as when valves need adjustment. It was pretty loud.
I am wondering if anyone has noticed the same? I am tempted to go to the dealer and have them check it out.
I am wondering if anyone has noticed the same? I am tempted to go to the dealer and have them check it out.
02-20-06, 10:48 AM
#2
Any chance it might be the fuel injectors?
I found this post from an earlier thread which was a response to "why are the fuel injectors so noisy?".....
I found this post from an earlier thread which was a response to "why are the fuel injectors so noisy?".....
Originally Posted by flipside909
That's a normal item with Direct Injection technology. The D4 in the 2GR-FSE IS350 engine puts out 1600 psi of fuel pressure. There's a reason for the clicking...annoying or not, that's how D4 technology works.
02-20-06, 02:05 PM
#6
Super Moderator
Originally Posted by accelerate
Remember this car has multi injection, that means we have two fuel injectors per cylinder. So we will hear alot of ticking,ticking,ticking,ticking!!! 
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02-20-06, 03:19 PM
#8
Clicking/Ticking noise is fairly well documented with DFI-based engines. I can't hear it when I'm in the cabin, not moving, engine idle and I have the 2.5L engine. Only when I'm standing outside next to the vehicle.
It kind of reminds me of a diesel engine.
Cheers,
Kermee
It kind of reminds me of a diesel engine.
Cheers,
Kermee
02-20-06, 08:05 PM
#10
Pole Position
Thread Starter
After diggin, yeah it seem that the culprit are the direct injectors.
When I first turn the car on, the ticking is not there, I am assuming this is cuz the port fuel injectors are the only ones working. As the car warms up, the clicking comes on...I take it this is when the direct injectors come on-line.
When I first turn the car on, the ticking is not there, I am assuming this is cuz the port fuel injectors are the only ones working. As the car warms up, the clicking comes on...I take it this is when the direct injectors come on-line.
02-21-06, 04:45 AM
#12
Lexus Test Driver
At the back of the engine near the firewall...
slightly to the left of center you will see the step up mechanical fuel pump. That is the source of the clicking. That is why everyone will hear clicking if they pop the hood and listen. The fuel pump steps up the fuel pressure from 60PSI to 1850 PSI. This is what enables the direct fuel injectors to atomize the fuel quickly for a complete burn and put it inside the top of the cylinder instead of outside and pulled in by suction through the intake valves. It also allows for more exotic effects of the Valve timing too. The intake and exhaust valves have a 45 degree range of advance/retard and can run with overlap for high performance. If you had a hose of water putting out 1850 PSI you could cut through metal. The valves have zero lash and are self adjusting so you won't ever hear any valve clatter. If you could hear the injectors it would probably be a hissing sound. The sound of the fuel pump indicates that you have one of the most advanced engine designs in the world. If you don't hear it then you're driving an older generation......so point it out proudly next time someone says, "What's that clicking sound?"
Rock
Rock
Last edited by Rockville; 02-21-06 at 04:48 AM.
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cfauvel (07-08-21)
02-21-06, 04:52 AM
#13
Originally Posted by Rockville
slightly to the left of center you will see the step up mechanical fuel pump. That is the source of the clicking. That is why everyone will hear clicking if they pop the hood and listen. The fuel pump steps up the fuel pressure from 60PSI to 1850 PSI. This is what enables the direct fuel injectors to atomize the fuel quickly for a complete burn and put it inside the top of the cylinder instead of outside and pulled in by suction through the intake valves. It also allows for more exotic effects of the Valve timing too. The intake and exhaust valves have a 45 degree range of advance/retard and can run with overlap for high performance. If you had a hose of water putting out 1850 PSI you could cut through metal. The valves have zero lash and are self adjusting so you won't ever hear any valve clatter. If you could hear the injectors it would probably be a hissing sound. The sound of the fuel pump indicates that you have one of the most advanced engine designs in the world. If you don't hear it then you're driving and older generation......so point it out proudly next time someone says, "What's that clicking sound?"
Rock
Rock
I've not heard it put that way before, it's very clear and will use it for sure
Much appreciated,
TripleL
02-21-06, 08:21 AM
#14
Super Moderator
Originally Posted by Rockville
The sound of the fuel pump indicates that you have one of the most advanced engine designs in the world. If you don't hear it then you're driving an older generation......so point it out proudly next time someone says, "What's that clicking sound?"
By the way, thanks for your technical insights in this and other threads.
02-21-06, 06:55 PM
#15
Lead Lap
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Originally Posted by meteoro
I was trying to disable the DRL's yesterday...