[Diy_efi] could i have multiple bad injectors?

[Toyota Supra]

thank you for the replies, just to clarify

the injectors are not receiving any sort of electrical signal, once they 
prove to function properly, they will be hooked up to an AIC 3, but right 
now, it is nothing.
since the injector is the only path for the fuel to get from the rail to the 
manifold, they have to be the source of leakage, but i am not sure as to 
why. mike has mentioned that they could have had the pintel bent, which at 
least is feasible, but i was careful to set them down with the ends up in 
the air, and not resting on anything. i will probably try a test with a 
bucket full of fuel and a pump to see if i can simulate conditions.

the fuel pressure is 35 or 37 pounds for base, they have never seen boost 
and are leaking at the base pressure, and they have not received an 
electrical signal as of yet.

is there a way to to examine the injectors to see if the pintel is 
physically damaged, does it bend or kink open and will i be able to visually 
inspect and see that?

thanks again for the replies

-j







=====================================================================

Some ECUs will sort of crack open the injectors if the driver
circuit loses a signal ground. Check your grounding all over
(engine to chassis, chassis to powertrain, chassis to ECU, and
while you're at it clean up the straps to shiny and coat with
thick grease after assembly). Let us know how you get on.

Cheers,
Rod


=====================================================================


I changed all my bosch injectors about a year ago and during
the process I noticed its very easy to bump/graze the small
pintle at the end of the injector!

So if there is fuel pressure and no signal and they leak then its
logical to conclude they have received physical damage *or* your
fuel pressure is way too high for the injectors...

rgds

mike


=====================================================================



Those should actually be Nippon Denso 450cc injectors and they are very
reliable.  I really doubt it is bad injectors.  You just changed to staged
injection, so I would look into that.  It sounds like they are being fired
when they shouldn't be.  Usually when those injectors go bad they will not
fire at all.  I have had one go bad in 9 years having Talons.

JET
92 Talon AWD


=====================================================================


----- Original Message -----
From: "Toyota Supra" <turbosupramk3 at hotmail.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, January 20, 2003 9:29 PM
Subject: [Diy_efi] could i have multiple bad injectors?


>as a background, i have just installed staged injection on my 6 cylinder,
as
>it was being tried out, the smell of fuel was prevelant without the car
>running. after searching for leaks, i could see fuel leaking in between
the
>upper and lower intake manifolds, because it was leaking past the injector
>and into the manifold, then puddling and seeping past the gasket
>
>... now, how could i have more than 1 injector do this? the odds are
pretty
>astronomical i would think? the secondaries are bosch style 440cc
injectors
>out of a talon (1 and a half sets) and the car ran great before removing
the
>very injectors i am trying to use, and upgrading to larger ones.
>
>so to summarize, i have 2 or 3 failing eclipse/talon/laser injectors, base
>pressure is only at 37 pounds, and there is no electrical signal going to
>the injectors to open them. i can't see the injectors having a normally
open
>coil, or everytime the car ignition was on, and the fuel system was
primed,
>it would flood before the ecu started to oscillate the injectors and
>signalling them to close
>
>sorry for the long post, i just can't figure out what is going on here,
any
>and all info or theories would be appreciated. thanks
>
>-j
>
>




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