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Richard - 15 May 2005 00:21 GMT

Is there a life cycle for injectors that needs to be considered or do they
just need to be cleaned (injector flush)? I imagine that a fluid (gas)
carries microscopic abrasives but can see that the wear is such that only
after a million miles one would need to think about replacement. Is there a
suggested replacement interval?
Thanks

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Richard

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whose ya daddy 96@ yahoo.com - 15 May 2005 01:24 GMT

>Is there a life cycle for injectors that needs to be considered or do they
>just need to be cleaned (injector flush)? I imagine that a fluid (gas)
>carries microscopic abrasives but can see that the wear is such that only
>after a million miles one would need to think about replacement. Is there a
>suggested replacement interval?
>Thanks

take em out
put them on a rail table
check the pattern
and output of each injector

hurc ast

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Jim Warman - 15 May 2005 08:06 GMT

I haven't noticed any identifiable life cycle for injectors.... we have
several pick up trucks locally with over 400,000 kms and no verifiable
running problems. Back when electronic injectors hit us full force, the
gasoline of the day was inadequate for keeping injectors clean. During a hot
soak, wax (olefins) would deposit in the injector gumming up the pintle and
restricting the orofices.

Modern gasolines don't appear to have these problems. Our injector flusher
gathers dust and we haven't had any reason to use it.

Good quality fuel filters have a very fine micron rating and, if serviced
regularly, should allow little in the way of harmful articles through. If we
purchase our gas from reputable, high volume outlets (if the fuel truck is
making a drop, I will wait several hours before filling), we reduce our
chances of introducing contaminants to our fuel systems.

I have replaced injectors in the past but (aside from diesel applications)
it isn't a real common requirement.

HTH

> Is there a life cycle for injectors that needs to be considered or do they
> just need to be cleaned (injector flush)? I imagine that a fluid (gas)
> carries microscopic abrasives but can see that the wear is such that only
> after a million miles one would need to think about replacement. Is there a
> suggested replacement interval?
> Thanks

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Kruse - 15 May 2005 14:27 GMT

> I haven't noticed any identifiable life cycle for injectors.... we have
> several pick up trucks locally with over 400,000 kms and no verifiable
> running problems. Back when electronic injectors hit us full force, the
> gasoline of the day was inadequate for keeping injectors clean. During a hot
> soak, wax (olefins) would deposit in the injector gumming up the pintle and
> restricting the orofices.

In the injector and <ON> the tip of the injector. When a car was shut
off there would be a little drop of gas on the tip of the injector. A
hot engine would vaporize the gas and all that was left was carbon.
(Remember gasoline is ~60% carbon) In time, you would have a piece of
carbon covering up the injector nozzle blocking the spray. As you
noted, gasolines have since been reformulated to stop this almost
entirely.
Years ago, Ford and BMW did independent tests on why their cars would
hesitate during a cold start up. Turns out that carbon buildup in the
intake runners and on the intake valves would soak up the gasoline that
was meant for the combustion chamber, at least until the carbon was
saturated with the gas. Then the cars would run okay. It's important to
keep the intake, the intake valves and injectors free of carbon.
Sorry to run on forever. I'll get off my soap box now.

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Richard - 15 May 2005 17:48 GMT

Thanks, I was suspecting that the "injector flush" was perhaps more of a
marketing ploy vs. a servicing requirement.

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> I haven't noticed any identifiable life cycle for injectors.... we have
> several pick up trucks locally with over 400,000 kms and no verifiable
[quoted text clipped - 24 lines]
> > suggested replacement interval?
> > Thanks

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Jim Warman - 15 May 2005 19:03 GMT

You picked it right.... there was a tine where gasoline technology lagged
behind and we could see a difference after an injector flush. There was a
point in time where flushing made good economic sense in improved
driveability and reduced fuel consumption. With improvements in gasoline
blending, I see little use for this service procedure today.

> Thanks, I was suspecting that the "injector flush" was perhaps more of a
> marketing ploy vs. a servicing requirement.
[quoted text clipped - 32 lines]
> > > suggested replacement interval?
> > > Thanks

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