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From: mrdarrett on 12 Apr 2007 18:35
On Apr 12, 11:18 am, "camry-keeper" <pwich...(a)nospam.hotmail.com>
wrote:
> You squirted water into your intake manifold??? The thermal gradients can
> cause cracking. Nice problem-solving discussion. Thanks.


Well, I sprayed it in as a mist - using one of those squeeze-sprayers
you can get for cheap at Wal-Mart. While the engine was revving at
2000 rpm. I sure didn't pour it in.

I was... upset... that the car still stalled on that day.

Thanks for the warning though.

Michael

From: Daniel on 12 Apr 2007 23:52

EdV wrote:
> I hear alot of EGR problems, is this something you have to replace
> every 100k-150k?? miles? is there anything you can do to prevent
> premature failure of EGRs?
==
Wasn't aware this type of problem was common.

My understanding was always that EGR valves are quite trouble free
apart from the propensity to become clogged or jammed with carbon.

For a long time I used RedLine complete fuel system cleaner which
claims to also clean emission control components. I know when I
resealed the oil pan and removed the center exhaust pipe, looking up
into the exhaust manifold it looked very clean.

Recently switched to Lucas fuel treatment which also claims to clean
carbon.

I suspect there are certain driving conditions which may contribute to
carbon accumulation more than others and I also suspect this can
shorten the life and responsiveness of oxygen sensors by coating the
ceramic cone in the exhaust stream which responds to the presence of
oxygen.

The other failure mode for EGR valves would be leakage in the
diaphragm or associated vacuum lines.

From: EdV on 13 Apr 2007 11:48
So paying for the expensive gas does pay the price, I hear they have
more "detergents" in them... right? would you recommend fuel systems
cleaners yearly? Is it true that if you drive slowly carbon buildup
will be much higher?

On Apr 12, 11:52 pm, "Daniel" <nospampls2...(a)yahoo.com> wrote:
> EdV wrote:
> > I hear alot of EGR problems, is this something you have to replace
> > every 100k-150k?? miles? is there anything you can do to prevent
> > premature failure of EGRs?
>
> ==
> Wasn't aware this type of problem was common.
>
> My understanding was always that EGR valves are quite trouble free
> apart from the propensity to become clogged or jammed with carbon.
>
> For a long time I used RedLine complete fuel system cleaner which
> claims to also clean emission control components. I know when I
> resealed the oil pan and removed the center exhaust pipe, looking up
> into the exhaust manifold it looked very clean.
>
> Recently switched to Lucas fuel treatment which also claims to clean
> carbon.
>
> I suspect there are certain driving conditions which may contribute to
> carbon accumulation more than others and I also suspect this can
> shorten the life and responsiveness of oxygen sensors by coating the
> ceramic cone in the exhaust stream which responds to the presence of
> oxygen.
>
> The other failure mode for EGR valves would be leakage in the
> diaphragm or associated vacuum lines.


From: Daniel on 13 Apr 2007 14:54
EdV wrote:
> So paying for the expensive gas does pay the price, I hear they have
> more "detergents" in them... right? would you recommend fuel systems
> cleaners yearly? Is it true that if you drive slowly carbon buildup
> will be much higher?
===
I use Shell gasoline. Used to be Chevron.
I use the fuel system treatment (RedLine previously, now Lucas)
continuously. The bottles are marked to add a few ounces per fillup.
Not sure about slow driving on longer trips with engine fully warmed.
My guess is carbon accumulation would be higher on an engine during
warm up and also while idling.

From: mrdarrett on 13 Apr 2007 16:19
On Apr 13, 11:54 am, "Daniel" <nospampls2...(a)yahoo.com> wrote:
> EdV wrote:
> > So paying for the expensive gas does pay the price, I hear they have
> > more "detergents" in them... right? would you recommend fuel systems
> > cleaners yearly? Is it true that if you drive slowly carbon buildup
> > will be much higher?
>
> ===
> I use Shell gasoline. Used to be Chevron.


"Used to be" Chevron? There's a story here, I can tell...


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