[elky] Re: New Injectors
- From: John Christensen <johncgg@xxxxxxxxx>
- To: elky@xxxxxxxxxxxxx
- Date: Thu, 22 Oct 2009 07:19:22 -0500
I had much the same issue when I first changed over. I had the 45# injectors
for the 305. So I upgraded to the 55#. Things are better, but I don't know
if the 7727 computer is set up for the 9C1 PROM. Mine is much better with
the 55#, and I think it is matched to the computer. I think mine is like the
truck program for the 350. With the higher compression and mild cam in my
engine, I know it could be better though. Just don't know how to go about
changing it.
There is a spacer that goes in there to raise the pods, that you can get for
about $10 on eBay, that is said to dramatically increase the air flow. Even
more than boring the throttle body and intake would do. Check it out. I
don't know if my injectors could compensate for the increased air or not,
but I am sure your setup could.
It would be interesting to figure out if I could swap to your ECM,
Injectors, and 9C1 chip and go without any other mods. I believe you have an
air intake temp sensor that I don't have. I don't know if it was in my
harness. Will have to look.
Glad you got this figured out!
JC
---
John Christensen
Saint Charles, IL
On Wed, Oct 21, 2009 at 4:44 PM, Jared Ryan <jryan@xxxxxxxxxxxx> wrote:
> I recently started wondering if my El Camino might have fuel injectors that
> were too small. One of the main reasons is that with the 350, the idle had
> never been stable, tending to hunt badly, and lately cold starts were
> getting to be more and more difficult. It would fire after five or six
> seconds of cranking, fire, then die after 20-30 seconds. I'd have to
> restart it, sometimes more than once.
>
> With Robert's help, I found that I had a Caprice 9C1 PROM with pickup
> injectors. Pickups had 55lb./hr. injectors, while the Caprice had 65lb./hr.
> injectors. So, my injectors were 15% smaller than the PROM was programmed
> for.
>
> I put the injectors in, but was interrupted in my testing by a battery that
> abruptly decided to go dead after a cold front blew threw. I put a new
> battery in last night, warmed up the engine, and set the minimum air
> adjustment. Then I put up all my tools and went to bed.
>
> Today, after I came home, I put the key in and started it. WOW. That's
> what I'm talkin' about! It fired after about 2 seconds, jumped up to a
> stable fast idle at 1400-1500 rpm, then very, very gradually began to slow
> down after a couple of minutes, settling down at a steady 800 rpm with no
> hint of hunting, running very smoothly. I didn't drive it, because it's
> clean and it's going to rain at any time, but it was very even and sounded
> great, and didn't smell rich.
>
> So the moral of the story is to make absolutely sure you use fuel injectors
> that match the PROM on any fuel injection project. I can't believe it took
> me *years* to realize I had a mismatch.
>
> ---> Jared Ryan <---
> jryan@xxxxxxxxxxxx | http://www.caminofx.org
>
>
>
> Rules: Please play nicely with others.
>
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