[V8] Stumbling / surging problem

[dsaad at icehouse.net]

I guess I was not clear about the flush job -
It absolutly does need a "machine" to do it. The process cleans the entire fuel
system from the fuel rails out to the injector tips, as well as deposits on the
intake valves and carbon in the combustion chamber.
It does a far better job than just pouring the cleaner stuff down the intake -
mostly because the machine replaces the engines fuel supply with the cleaner (it
is connected to the fuel line), and the motor is run for about 30 minutes this
way - giving the cleaner more time to work.
I have done both - and the power flush method works great.
The do-it-yourself method is fine on an already working motor that you just want
to de-carbon the combustion chamber. I do this as part of my yearly tuneup.
Since this car sat so long, and fuel varnish was already found (wasn't that
stated in the original post?), it seems like a no-brainer to me to do this
process to make sure the fuel injectors are freed up and the tips are clean.

I guess if it was my car, I would just do it as part of a complete ignition tune
up, and replace all the filters. Chances are good the problem will go away after
all that - but if it does not - at least you have a better idea of what the
problem isn't.


Dave


Quoting cobram at juno.com:

>  dsaad at icehouse.net writes:
> > How about doing a "power flush", where a cleaning fluid like the GM
> > Top Engine Cleaner is run through the fuel injectors for a while using
> a
> > special machine?
>
> You don't need a special machine, and you don't feed it in through the
> injectors.
>
> > This may clean up the results of the car sitting around for so
> > long.  It also cleans out all the carbon buildup and in general,
> magically
> > makes your car like new again.
>
> Carbon doesn't build up from sitting too long, unless of course some
> carbon based life form has been storing food in the head.
>
> > The symptom sounds like a classic buildup of deposits on the intake
> > valves.
>
> The symptoms don't sound like valve deposit buildup to me at all.  Hard
> starting and rough idle after startup are the symptoms of carbon buildup,
> neither of which this car seems to suffer from.
>
>
> BCNU,
> http://www.geocities.com/cobramsri/
> Health is merely the slowest possible rate at which one can die.
>