[Diy_efi] What Injector Is This?
Mike
erazmus at iinet.net.au
Thu Apr 3 11:10:25 GMT 2003
Perry,
mmmmm, Are you sure you're not confusing normal MAF
operation with the 'clean' mode only at engine shutoff ?
All the (recent, last 15yrs) Bosch MAFs I have seen have
the classic hotwire mechanism (duals as in the ford and with
temperature compensaion) which runs a current through
the wire so it dissipates a certain amount of heat, it is
the removal of this heat by the mass air flow in concert
with an internal wheatstone bridge which provides the
measurement signal. Under these conditions the wire is
not visibly hot but I wouldnt want to touch it.
Upon turning off the engine, the ECU sends a signal to
the MAF electronics to provide a 'clean' to the main
sensing wire - it passes a larger current for a few
seconds to burn off any particulates, this is where it glows
light red or as some have observed white hot.
This is essential because under normal operation for
many hours when the sense wire is hot, particles tend
to stick to it and upset the linearity of its output.
I would expect the ford MAF has a similar 'clean' mode
otherwise it would need frequent cleaning manually...
It may be possible the ford MAF is not as robust to 'clean'
cycles and these may be limited to a multiple of engine
shutoffs or maybe its given a clean during a sec or so
before cranking, either way I would be surprised there
were no 'clean' mode as described above for the Bosch.
rgds
mike
At 02:30 AM 4/3/03 -0800, you wrote:
>Mike,
>
>The Ford MAFs work differently. They have 2 elements, one exposed to the
>air, one not. They are heated all the time.
>
>--Perry
>
>On Thu, Apr 03, 2003 at 03:12:11PM +0800, Mike wrote:
>> Is your ECU power off MAF wire burn working properly ?
>>
>> ie. Do you see the MAF wire glow white hot for a sec or
>> two when you turn the engine/ECU off ?
>>
>> rgds
>>
>> mike
>>
>>
>>
>> At 04:54 PM 4/2/03 -0600, you wrote:
>> >
>> > Good deal Perry, I'm going to try it tonite. -----Original
Message-----
>> >From: Perry Harrington [mailto:pedward at apsoft.com]
>> >Sent: Wednesday, April 02, 2003 4:04 PM
>> >To: List for general do-it-yourself EFI talk
>> >Subject: Re: [Diy_efi] What Injector Is This?
>> > This
>> >should clean any goo off. BTW, the 'wire' is made of platinum, so brake
>> >clean shouldn't hurt it. No probs. --Perry On Wed, Apr 02, 2003 at
>> >03:12:02PM -0600, Joe Mills wrote:
>> >> Justin,
>> >> Yeah, I don't think the guy I bought it from was real hard-core tech
savy.
>> >> He was sharp, but because he could, he paid shops in this area to
work on
>> >> his car.
>> >> I did the Google search on the number, but came up empty.
>> >> The Pro-M site says that running with a dirty detector wire in the
MAF can
>> >> lean the car by as much as 20%.
>> >> They don't go into any detail on how to clean it, other than to say
use a
>> >> pipe cleaner.
>> >> Any experience with that?
>> >> Joe
>> >>
>> >> -----Original Message-----
>> >> From: Justin Starkey @ VMP [mailto:justinv6 at bellsouth.net]
>> >> Sent: Wednesday, April 02, 2003 11:08 AM
>> >> To: List for general do-it-yourself EFI talk
>> >> Subject: Re: [Diy_efi] What Injector Is This?
>> >>
>> >>
>> >>"" I say that in
>> >> parenthesis because its all a matter of pressure, some people get
confused
>> >> with injector terminology because ford fuel systems run at 39psi, but
ford
>> >> The proper way to quote a ford injector (or
>> >> Lucas makes some 38lb injectors
>> >> Try doing a google.com search with that PN.
>> >>
>> >> Justin Starkey
>> >> www.VelocityMustangPerformance.com
>> >><http://www.VelocityMustangPerformance.com>
>> >> **Quote Original E-Mail In Reply**
>> >>
>> >> ----- Original Message -----
>> >><mailto:joem at mhent.com>
>> >><mailto:'diy_efi at diy-efi.org'>
>> >> Sent: Tuesday, April 01, 2003 11:16 PM
>> >> Subject: [Diy_efi] What Injector Is This?
>> >>
>> >>
>> >> Hey guys/gals, newbie here!
>> >> I've got a problem on my supercharged 97 Mustang GT.
>> >> The car is detonating and, in researching the problem, I realize that
the
>> >> injectors on the car are not what I was told they were by the seller
>> (Bosch
>> >> brand, 38# injectors).
>> >>
>> >> I am looking to determine:
>> >>
>> >> What brand of injector these are
>> >> What size injectors these are
>> >>
>> >> Clues:
>> >>"" scribed on the side of each
>> >> Numbers stenciled on them:
>> >> 2267
>> >> 17105898
>> >>
>> >> I have a closeup shot of one at:
>> >> http://www.mustangmods.net/data/578/Injector2.jpg
>> >><http://www.mustangmods.net/data/578/Injector2.jpg>
>> >>
>> >> Thanks DIY_EFI!
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> _______________________________________________
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>> > --
>> > & Instrumentation, Inc
>> > http://www.dainst.com/ Those who would
give
>> >up essential liberty to purchase a little temporary safety
>> >deserve neither liberty or safety. Nor, are they likely to end up with
>> either.
>> > -- Benjamin Franklin
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>
>--
>Perry Harrington Data Acquisition & Instrumentation, Inc
>perry at dainst dot com http://www.dainst.com/
>
>Those who would give up essential liberty to purchase a little temporary
safety
>deserve neither liberty or safety. Nor, are they likely to end up with
either.
> -- Benjamin Franklin
>
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>http://www.diy-efi.org/mailman/listinfo/diy_efi
>
>
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