2007 Prius engine ticking noise

[aktam]

Hello,

I'm noticing a ticking noise from the engine during normal acceleration proabably at around 25-35 mph. Wondering if this is normal. Thanks!

[qbee42]

Are you sure it's engine noise and not the brake accumulator pump?

Tom

[aktam]

<div class='quotetop'>QUOTE(qbee42 @ Jun 27 2007, 07:58 PM) [snapback]469179[/snapback]</div>

Are you sure it's engine noise and not the brake accumulator pump?

Tom
[/b]

Yes, it's coming from the engine. It sounds like valves or the lifters making the noise.

[qbee42]

<div class='quotetop'>QUOTE(aktam @ Jun 28 2007, 12:07 PM) [snapback]469443[/snapback]</div>

Yes, it's coming from the engine. It sounds like valves or the lifters making the noise.
[/b]

Hmmm...hard to say when you are talking about noises. The Atkinson cycle engine on the Prius does make some funny noises, almost like a small diesel. Does it sound a bit like a diesel?

Tom

[aktam]

<div class='quotetop'>QUOTE(qbee42 @ Jun 28 2007, 11:41 AM) [snapback]469553[/snapback]</div>

Hmmm...hard to say when you are talking about noises. The Atkinson cycle engine on the Prius does make some funny noises, almost like a small diesel. Does it sound a bit like a diesel?

Tom
[/b]

You're right...it does sound a little like a disel engine. So that's normal?

[Ichabod]

All sorts of weird noises are normal. Don't sweat it unless it breaks down

[jayman]

My Prius never makes any sort of clatter or ticking noise, except idling and you have to open the hood to really listen for it. Even running 0W-20, the motor sounds happy at idle.

The FJ makes more of a rattle at idle, apparently there is a check valve in the PWM purge valve. An easy fix for that is to unbolt the PWM valve and isolate it from the intake manifold. I did that with mine and the annoying ticking/tapping sound disappeared.

[mikepaul]

In the last week or so I've noticed a distinct tick sound when the car is idling, which has been at the start of driving when it's too cold to stop the ICE at the light. It gets louder once I accelerate, but is lost in the road noise soon after.

I googled a bit and manifold leaks are supposed to sound like that, but I'm not sure at what point I'll see some drop in power or MPGs as the sign the dealer should look at it. 63,500 or so as of this week.

And while I did only notice it once the radio was accidentally left off, I doubt I missed it all this time just because I usually have the volume up rather high. Is there anything the might have been muffling the noise that might have worked its way loose?...

[galaxee]

any chance you've put premium gas in it?

[mikepaul]

<div class='quotetop'>QUOTE(galaxee @ Jul 3 2007, 11:39 PM) [snapback]472729[/snapback]</div>

any chance you've put premium gas in it?
[/b]

Not intentionally. Last fill-up was 87 from (I think) Texaco, and today was generic 87 from Racetrack.

I did add some Lucas Oil gas additive well over two weeks ago, but I expect that to be long gone.

I guess when something bad happens I'll be primed for it. Not today: 49.9MPG on the 16-mile drive back from getting gas after seeing "Transformers"...