Re: engine rattle

On Mon, 22 Aug 2005 04:47:03 +0000, J.Lef wrote:

> .>
>> sounds like the symptoms of pinking (also known as pre - ignition or
>> detonation), the engine probably needs a decoke, the excess oil it is
>> burning has probably coated the combustion chamber, it then glows and
>> preignites the fuel, causing the metallic rattling sound. A swap to
>> better fuel and maybe a slight retard of the ignition timing may improve
>> things.
>>
>> mrcheerful
>
> Thanks for all replies. I never would have imagined I
> was having pinging, because I have heard this in other engines, and didnt
> think this was it.
> However, I wanted to try the possible simplest
> solution first, and waited till fuel tank was down to about an eighth full,
> and then filled it with super unleaded. Miraculously the rattling has
> stopped. I have floored the engine a number of times, to try and get the
> rattle, but it has been over a hundred and fifty miles and cant hear.
> So, I am hoping this is the problem. However, I hate to
> pay an extra thirty cents or so a gallon.
>
> One question, could the situation that had created the
> pinking, also cause the engine, to not get as many mpg as it used to. Up
> until a year or two ago, I was getting a combined mileage of around 25 mpg.
> And straight hiway runs I could get well over thirty miles a gallon. Its
> been down to about 15 -17 mpg. But it seems like with this new super fuel,
> My mileage is picking up. Is this possible?
>
> Much regards to all.
>>
>>
few things to try:

I run ALL my cars on Super, even my '95 Tercel. People tell me I'm
throwing my $$$ away, but I only had this problem during the last 'fuel
shortage' when I went to regular for a while. Never again. With ALL my
Toyotas, I have noticed I consistantly get 4-6 MPG more than people I know
with similar cars, with similar maintenance.

You can try adding Techron or using Chevron gas with Techron in it. This
will clean up any deposits in the engine. Or, you can have it BG'd, maybe
by your dealer. They put a solution in it and it softens and removes the
carbon deposits. When the techs run the car around the lot afterwards you
wonder what the hell blew in the motor until it burns away...

As far as fuel, don't want to pony up the extra $$$? I always keep a full
tank; it keeps my tank from rusting, and when I don't have any money, I
still have fuel! (an old habit from my teenage days when we used to sfrape
to buy gas after the FIRST oil crisis...) So what you can do is, if you
want to run regular...fill the tank with mid grade. On the next fill, make
it regular...on the next mid-grade...etc. I run higher octane so I use
Mid-grade and super on alternate fill ups. I figure I run 91 Octane all
the time. In the other scenario, you would be running 88 octane.
.

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