Hybrid Car – More Fun with Less Gas

Cleaning fuel jets every 2 years necessary? - Page 3

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Posted by richard schumacher on August 19, 2009, 4:05 am

Ditto that.  If you use E10 you're getting injector cleaner with every

Posted by Charles on August 19, 2009, 6:24 am

richard schumacher wrote:

All that happens when they clean the injectors is a pressure pak can of
solvent??, is connected to the fuel line and this solvent goes through
the system and that costs heaps. Not worth the effort or money, after
market sales gimmick.

Posted by Toby Ponsenby on August 19, 2009, 9:04 am

On Wed, 19 Aug 2009 16:24:38 +1000, Charles blathered on in:

OK,  some thoughts on this wouldn't go astray.
Given that the injectors of a bosch pattern EFI car are positioned in the
incoming air stream so as to have the atomised spray 'join' the incoming
air which BTW is presumably filtered already.

And given that the PCV systems in use actually put their output into the
system WITH heaps of that self same incoming air, and that getting "dirt"
into the crankcase of an engine is in itself relatively difficult - in
point of fact it would need to be deliberately introduced, else be the
by-product of atrocious maintenence practices...

And given that the fuel itself is provided by the OilCos essentially
'clean' - under pain of having their arses exposed by a comtaimiation

And given that all EFI vehicles get quite reasonable filtering systems
stock standard.

And given that the petrol and for that matter ethanol (is)/are (a) cleaning
agent(s) anyway,

How the fuck do injectors get 'dirty' anyway?
I can understand 'worn', but not dirty.

Additionally recentlly I had reason to remove a fuel tank from my machine
that had to that point travelled 350,000Kms over a period of 9 years.
there was not even a hint of dirt (or any patriculate matter) or 'water'
in the bottom of the (plastic) tank. Nothing. Not a zot. Fuck all, even.



Posted by Noddy on August 19, 2009, 10:01 am

They generally don't, at least not on the inside anyway. However they're
usually positioned close enough to the inlet valve to allow carbon "blow
back" to form on the nozzle, and in some cases this can be bad enoug to
affect the spray pattern after a while.

Does that mean there's any benefit in "sonic cleaning" or any other process
where the injectors need to be removed from the engine and run through some
"Dr. Zooks magical elixir" machine at some ridiculous price that gets close
to actually buying new injectors?

Of course not.

On the other hand, there are some that need nothing more than periodic
removal and cleaning the tips with some solvent and an old toothbrush to
restore them to as new condition.

I've seen some cars hold a fair amount of rubbish in the bottoms of their
tanks, and some of it has looked like mud, but very little of it (if any)
seems to find it's way to the injectors.


Posted by D Walford on August 19, 2009, 10:46 am

Charles wrote:

To do it properly the injectors need to be removed then cleaned and
tested on a proper machine.


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