Re: engine rattle


"HachiRoku" <Trueno@xxxxxxxx> wrote in message
news:0FvOe.2132$k92.1965@xxxxxxxxxxx
> 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.

Good grief 88 - 91 ? I am running the Lexus on 97 in the UK, the lowest we
can get is 95. 88 must be like running on paraffin (kerosene), no wonder
the OP has got pinging !!

mrcheerful


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