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Messages - 46Tbird

2
Engine Tech / '84 302 CFI - no fuel pumps, injectors not firing
UPDATE

The car is running now, no problem.  I want to thank you all for your advice and suggestions.

The winner-
Quote from: softtouch;303584
+1 for what ChuckW says.
The ECU has to power-up so it can provide the ground for the fuel pump relay and operate the injectors.

There is a small pig-tail wire on the negative battery cable. This is the ground for the ECU computer. Make sure it is connected.


The "small pig-tail wire on the negative battery cable" was never disconnected, but somehow the connector itself had gotten so corroded that it was no longer a functional ground for the ECU.  I opened the connector, saw how nasty it was, then cleaned and reconnected it and it fired up on the first turn of the crankshaft. 

Amazing how the simple things can bring a project to a halt. 

Again, I wanted to thank you guys for your help.  Hope you all had a great Christmas and have a Happy New Year-
Danny
4
Engine Tech / '84 302 CFI - no fuel pumps, injectors not firing
I can't tell you how much I appreciate all your suggestions guys.  Unfortunately I'm not going to be able to get to this car again until Christmas day so I won't have an update until then.  Sorry to keep you in suspense.  To keep you entertained, here's a picture of the car.  I'm sure some of you remember it.  The engine is now PURPLE[/color].  BLEH.  But that's what my sister wanted, so that's what she got.

7
Engine Tech / '84 302 CFI - no fuel pumps, injectors not firing
I will test the injector pulse with a test light, thanks.

Quote from: Chuck W;303545
You said you did an engine swap...care to clarify more?  What was swapped?  What was changed?

The original 302 long block that had a rod knocking was replaced with a good 1986 302 long block.  The car's original accessories, transmission, exhaust, and CFI system were retained.

Quote
Obviously something didn't get reconnected, but who's to say what.

It's hard for us to guess when you don't give us all the details.

I'm asking if there is any one connection / device that controls both the pumps, and the injectors.  Since these are the only two things that are not working on the car, my assumption is that they are both not working for the same reason.  And of course I could be wrong.

Let me turn it around.  If you had a car that wasn't getting power to the fuel pumps and the injectors weren't firing, where would you begin looking? 

I don't have any wiring diagrams handy, so if anyone has an EEC-III CFI diagram they could post, I would appreciate it.  Thanks.
9
Engine Tech / '84 302 CFI - no fuel pumps, injectors not firing
Yes, I figured pictures would help but I'm not near it at the moment. :)

Yes it has the inertia relay.  It is in the trunk if I remember correctly.  The car was driven into the work area, so I would assume it has not been "shocked" to set the inertia relay.  But that is a good suggestion and I will check it.

Does this also control the injectors firing?  I thought it was just the pump(s).  Thank you.
10
Engine Tech / '84 302 CFI - no fuel pumps, injectors not firing
Any ideas?  It sounds like a faulty relay to me, a disconnected sensor, or a bad/disconnected ground.

We just completed an engine swap so everything is a possibility.

When you pour gas down the throttle body, the car fires right up, so ignition is not an issue. 

The pumps would not come on with the key, so we hard-wired them with 30' of wire.  That made the pumps come on (and there was pressure at the TB) but the two injectors would not squirt.

Everything inside the car is functional.  There are no blown fuses.

So my assumption is that both of these fuel delivery issues are related, but don't know where to begin diagnosing the problem.  There are a series of connectors on the driver side engine compartment that I believe are for EEC diagnostics, but there is one that looks suspiciously un-plugged.  It has four wires in a square connector; one of the wires is a large white/yellow that looks like a power lead. 

Thanks for any help, I appreciate it.
Danny
13
Suspension/Steering / 2002 Mustang GT springs
Surely you cut those springs to get that ride height...

I have springs designed to lower a '99-04 GT convertible by 2" and it sits about the same.

14
Lounge / look at our fancy new boat anchor
Truck 409s aren't real desirable, the blocks have a relief cut into them to lower compression.  Also the front dress and oil pan has to come from a car to fit in most chassis.  They have a different deck height which makes them unique. 

It's kind of like the old Dodge and DeSoto Hemi engines.  Yep they look good, but they're oddball enough that finding parts is nearly impossible. 

They go for about $500 or less usually, but the fact yours turns over (and has a fresh oil leak :D ) means that it may go for a little more.  Good score!
15
User Rides / Finished the '84
Just used more headliner material over the stock stuff.  The cardboard base had gotten waterlogged at some point and we weren't able to take the old carpet off.