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Old 07-05-2005, 17:01   #1 (permalink)
Stephen
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99 F150 4.6 engine rattle

I'm getting a bit of rattling when I apply a little gas until the engine
is fully warmed up. It sounds kind of like preignition from bad gas or
timing but it goes away if I apply more gas or let it warm up a little
more. I haven't tried a higher grade of gas as the truck was designed
to run on regular and dammit I don't want to pay for premium at the
prices we have these days.

Any suggestions? Some of the things I am thinking of before I give up
and take it in for a tune up are plugs, fuel filter, air filter. From
the sounds of it, I'm looking at $2-300 for a basic tune-up. Do any of
the of the shelf injector cleaner additives work?

Thanks for any inspiration you lend me.

Stephen

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Old 07-05-2005, 18:01   #2 (permalink)
lugnut
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Re: 99 F150 4.6 engine rattle

On Tue, 05 Jul 2005 23:47:20 GMT, Stephen
<Steelystephen@coldmail.com> wrote:

>I'm getting a bit of rattling when I apply a little gas until the engine
>is fully warmed up. It sounds kind of like preignition from bad gas or
>timing but it goes away if I apply more gas or let it warm up a little
>more. I haven't tried a higher grade of gas as the truck was designed
>to run on regular and dammit I don't want to pay for premium at the
>prices we have these days.
>
>Any suggestions? Some of the things I am thinking of before I give up
>and take it in for a tune up are plugs, fuel filter, air filter. From
>the sounds of it, I'm looking at $2-300 for a basic tune-up. Do any of
>the of the shelf injector cleaner additives work?
>
>Thanks for any inspiration you lend me.
>
>Stephen



Try giving the MAF sensor a good cleaning. You will need a
tamper resistant torx bit to remove it. I believe it is a
T20 size. It has the center drill to accommodate the head
of the screws. You will need a residue free electrical
cleaner to clean it.

See here:
http://www.fordf150.net/howto/clean-...low-sensor.php

Lugnut
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Old 07-08-2005, 14:01   #3 (permalink)
Stephen
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Re: 99 F150 4.6 engine rattle - Gone!

lugnut wrote:

> On Tue, 05 Jul 2005 23:47:20 GMT, Stephen
> <Steelystephen@coldmail.com> wrote:
>
>
>>I'm getting a bit of rattling when I apply a little gas until the engine
>>is fully warmed up. It sounds kind of like preignition from bad gas or
>>timing but it goes away if I apply more gas or let it warm up a little
>>more. I haven't tried a higher grade of gas as the truck was designed
>>to run on regular and dammit I don't want to pay for premium at the
>>prices we have these days.
>>

>
> Try giving the MAF sensor a good cleaning. You will need a
> tamper resistant torx bit to remove it. I believe it is a
> T20 size. It has the center drill to accommodate the head
> of the screws. You will need a residue free electrical
> cleaner to clean it.
>
> See here:
> http://www.fordf150.net/howto/clean-...low-sensor.php
>

Thanks for the tip on the MAF, I did clean it along with the other
things I did for a tune up (plugs, fuel and air filter, oil etc.). The
low-load rattle is gone now but I am not sure which of the things I did
made it go away.

The plugs were clean and a good colour but the gap had widened from .054
to a range of .075 to .090. I could believe that the extra wide gap
might have been causing the rattle as it would affect timing and quality
of ignition. I think they are the original plugs and the truck has
130,000 Kms (80,000 miles) on the clock. Fliters were a little dirty
but not too bad. I'm interested to see if I get any improvement in
milage.

On the MAF tech tip site above, I was wondering why he didn't just clean
the MAF element by opening the air box. When I changed air filters the
MAF was right out in the open and very easy to clean. You would have to
follow his procedure if you wanted to take it right out but that should
not be necessary just to squirt some contact cleaner over the element.

Incidentally, I also did my rear brakes and changed oil. I was quoted
$100 labour for the brakes and $160 just to change the plugs. Brakes
took 20 minutes, and plugs about 45 minutes (pretty tight getting in
there). Oil change is a 5 minute job. Flat rate, book pricing is the
biggest scam going!


Stephen

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Old 07-08-2005, 16:01   #4 (permalink)
lugnut
Guest
 
Posts: n/a
Re: 99 F150 4.6 engine rattle - Gone!

On Fri, 08 Jul 2005 15:36:27 GMT, Stephen
<Steelystephen@coldmail.com> wrote:

>lugnut wrote:
>
>> On Tue, 05 Jul 2005 23:47:20 GMT, Stephen
>> <Steelystephen@coldmail.com> wrote:
>>
>>
>>>I'm getting a bit of rattling when I apply a little gas until the engine
>>>is fully warmed up. It sounds kind of like preignition from bad gas or
>>>timing but it goes away if I apply more gas or let it warm up a little
>>>more. I haven't tried a higher grade of gas as the truck was designed
>>>to run on regular and dammit I don't want to pay for premium at the
>>>prices we have these days.
>>>

>>
>> Try giving the MAF sensor a good cleaning. You will need a
>> tamper resistant torx bit to remove it. I believe it is a
>> T20 size. It has the center drill to accommodate the head
>> of the screws. You will need a residue free electrical
>> cleaner to clean it.
>>
>> See here:
>> http://www.fordf150.net/howto/clean-...low-sensor.php
>>

>Thanks for the tip on the MAF, I did clean it along with the other
>things I did for a tune up (plugs, fuel and air filter, oil etc.). The
>low-load rattle is gone now but I am not sure which of the things I did
>made it go away.
>
>The plugs were clean and a good colour but the gap had widened from .054
>to a range of .075 to .090. I could believe that the extra wide gap
>might have been causing the rattle as it would affect timing and quality
>of ignition. I think they are the original plugs and the truck has
>130,000 Kms (80,000 miles) on the clock. Fliters were a little dirty
>but not too bad. I'm interested to see if I get any improvement in
>milage.
>
>On the MAF tech tip site above, I was wondering why he didn't just clean
>the MAF element by opening the air box. When I changed air filters the
>MAF was right out in the open and very easy to clean. You would have to
>follow his procedure if you wanted to take it right out but that should
>not be necessary just to squirt some contact cleaner over the element.
>
>Incidentally, I also did my rear brakes and changed oil. I was quoted
>$100 labour for the brakes and $160 just to change the plugs. Brakes
>took 20 minutes, and plugs about 45 minutes (pretty tight getting in
>there). Oil change is a 5 minute job. Flat rate, book pricing is the
>biggest scam going!
>
>
>Stephen


Looks like you won all the way around. Thanks for the
feedback.

Lugnut
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