Strange Clicking Noise from Engine

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Old 23 Aug 2005, 05:29 pm   #1 (permalink)
infntrymn
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Default Strange Clicking Noise from Engine

My 98 Camry has about 140Km miles. and is driven roughly 120 to 150 per
day.

In the last couple of days, we have noticed a faint clicking that seems to
peak at about 3000RPM while driving, then it quiets down. More recently
(today) it is clicking while at idle. When I depress the accelerator
slightly it becomes a little quieter, but again peaks as the RPMs approach
3000.
It has been suggested to me that the timeing is off or maybe the cam os or
lifters are out of adjustment/going bad.

Any ideas? Is there a remedy short of major engine repair?

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Old 23 Aug 2005, 05:37 pm   #2 (permalink)
Daniel
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Default Re: Strange Clicking Noise from Engine

You need to be more specific as to where this clicking seems to
originate.
>From the interior?
>From the engine?

If from the engine, open the hood and move the throttle by hand to see
if you can determine wheter the noise is coming from the front, rear,
left or right side, - perhaps near the top?
Could be something in the brakes, a loose heat shield, don't assume
engine repair until you isolate the source further.
If you've been changing the oil, the engine should be fine.

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Old 23 Aug 2005, 05:54 pm   #3 (permalink)
infntrymn
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Default Re: Strange Clicking Noise from Engine

Thanks, Daniel.
I have listened under the hood, and the noise seems to come from the top
left (top of the engine on the passenger side of the engine compartment.
The engine is trans-mounted but it is definitely internal. I had thought
the belt or one of the pulleys was loose, but the more I listen, the more
it sounds internal.

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Old 23 Aug 2005, 08:22 pm   #4 (permalink)
MUADIBŪ
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Default Re: Strange Clicking Noise from Engine

Also Think about the possibility that this could be quite simple. I
had a similar noise on my last Camry. Turned out to be a small piece
of the belt stil holding on after it started to shred just a little.
New timing belt was the cure. The position noted on your post would
suggest this is a possible item to check.
Good luck
>Thanks, Daniel.
> I have listened under the hood, and the noise seems to come from the top
>left (top of the engine on the passenger side of the engine compartment.
>The engine is trans-mounted but it is definitely internal. I had thought
>the belt or one of the pulleys was loose, but the more I listen, the more
>it sounds internal.




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Old 01 Sep 2005, 04:05 pm   #5 (permalink)
infntrymn
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Default Re: Strange Clicking Noise from Engine

I had the mechanic who changes the oil listen and he called the symptom a
"Rod-Knock" which he explained is a result of the CAM abd pistons being
out of allignment. He indicates that if this is correct, repair is either
to have a new CAM "machined" as well as getting new associated parts
(pistons, rods, etc.) Alternatively I could buy another engine (new or
used). Both options seem extreme for a car that is nearly 8 years old.
Does anyone have any idea what this problem is and a possible solution.

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Old 02 Sep 2005, 04:01 pm   #6 (permalink)
davidj92
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Default Re: Strange Clicking Noise from Engine

infntrymn wrote:
> I had the mechanic who changes the oil listen and he called the
> symptom a "Rod-Knock" which he explained is a result of the CAM abd
> pistons being out of allignment. He indicates that if this is
> correct, repair is either to have a new CAM "machined" as well as
> getting new associated parts (pistons, rods, etc.) Alternatively I
> could buy another engine (new or used). Both options seem extreme
> for a car that is nearly 8 years old. Does anyone have any idea what
> this problem is and a possible solution.


A "rod-knock" is not a click, it is a hard, heavy, deep metal to metal
clunk. The first one will usually scare you due to it's severity. If cam and
pistons are out of alignment you can have possible low performance,
backfiring, stumble and hard starts or a combination of these. If the engine
is interferance and you have this then a valve will hit a piston and cause
damage and the symptoms won't be clicking.
You really need a listening device, some experienced mechanics will use a
tube or long metal device such as a screw driver, one end held close to an
ear and the other end touching various parts of the engine to find the
source. (Be very careful of moving parts) The best option is a mechanic's
stethoscope to find where the click is coming from as sound will travel
through metal and all over the engine compartment.
HTH, davidj92


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