Ask your dealer to locate the source of noise within the engine (eg.
upper cylinder head, timing cover, lower block). The 3.5L should work
fine on regular 87 (R+M)/2 gas too with the timing automatically
adjusted to compensate.
Let's hope it's in the easier areas of the engine. Poor piston/
cylinder fit selection is a cost-containment reason on a production
line for piston slaps. "Essentially, the piston moves sideways and
"slaps" or "knocks" hard against the cylinder bore and causes damage
to the engine pistons and cylinders, excessive smoke emissions,
excessive oil consumption, carbon buildup on piston heads, decreased
mileage, and a loud and obnoxious "slapping" or "knocking" noise, all
of which diminishes vehicle resale value in the trade."
On Mar 28, 4:15 pm, "Graybeard" <graybear...@[EMAIL PROTECTED]
> wrote:
> My ES350 has developed an unusual sound. With only 10,000 miles on it,
and
> burning Premium (what a misnomer) gasoline, it is making a ticking sound
> when I accelerate. The sound was not noticed until it got cold here in
> Florida and the AC was turned off.
>
> Also, the sound is loudest when the engine is cold. When the temp
reaches
> normal, the sound is barely audible. It is also most noticeable when
> accelerating up a hill.
>
> The tick-tick sound reminds me of the ping we heard due to pre-ignition
on
> the old cars. That is a sound that I haven't heard in years. Also, I
> recall a similar sound due to valve noise on the old OHV engines.
>
> I thought that the new computer controlled engines contained a "noise
> detector" that adjusted the timing or something to prevent that problem.
>
> Does anyone have any experience with this condition? I have an
appointment
> with the dealer in a few days, but feel that they are going to ignore
the
> problem and tell me that it is "natural" or some such thing.
>
> Regards,
> Graybeard
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