My injectors don't seem to be spraying any fuel.
Fuel pump is pumping.
Car will start with starter fluid sprayed into the throttlebody.
But the injectors aren't spraying.

Car is an 86 Trans Am.
Orginally an LG4, now has an 87 TPI with an ECM from a 91.
Harness has been modified for Speed Density.

VATS is turned off in the chip.
Injectors have power, but they are not pulsing when cranking the motor or when it runs off of starter fluid.

Thanks for any info you all can provide.

 

is the ground wire for the injectors attached in the back of the head?

 

I am pretty sure it is, I hooked up about 6 ground wires back there. I'll double check just to make sure.

Thanks

 

The injector ground comes from the computer. It is a pulsed ground.

I believe his computer is not pulsing the injectors because his fuel pump is not working correctly as in the computer is not controlling it. It is currently wired to the battery for testing.
Please correct me if I am wrong.

 

Hey John,
you are correct.
I am going to see if I can get one of my friends to bring her 91 Trans Am to my house and hook my ECM to her car to see if the ECM is functional.

 

If the injectors aren't pulsing, verified with a test light, then it isn't the fuel pump's fault. If you just believe that there's no fuel, verify fuel pressure with a gauge and once you're sure you have FP verify that the injectors are or are not pulsing with a test light.

ECM isn't getting reference signal from the distributor
or ECM is bad
or wiring harness problem.

If you have power to the injectors, then I believe the fuses are good; double check though.

There's a troubleshooting procedure in the FSM. Use it. It is your friend

 

What is the FSM?

I verified with a test light last night in the injector connector.
I am going to check Fuel Pressure when I get the gauge.

I am also going to put my ECM into a friends car to see if hers will start up and run to check my ECM.

 

You are correct, the ECM tells the fuel pump to run based on the referance signal(ppl/wht wire) from the ignition module. I double checked myself.
The ECM doesn't get a feedback signal that the pump is running though which is what I had thought. The ECM doesn't care if the pump is really running as long as it is told to run that's all that matters, it will then pulse the injectors based on that referance pulse.
Manny changed the ignition module so he needs to simulate the referance pulse to be sure it's good with a test light connected to 12 volts and apply that to the referance wire(ppl/wht wire), the injectors should pulse(using a second test light on one injector) when he removes the "hot" test light from the referance wire.
I suspect a faulty ECM.

 

By the way Manny, a FSM is a factory service manual. You really should look into getting one. Not a Haynes or Chiltons either, a factory one as thick as a big phone book just for your year and model car. I use mine to death.

 

I was about to order the manuals, but I don't have the cash.
I was going to get the 86 and a 91, $165 for both from Helms.

I am going to put my ECM in her car as soon as she gets here.
I don't want to buy another ECM.

 

Don't buy new FSM's, shop e-bay or something like that. I got mine for $20. Books don't go bad.......

Don't really have to get a new ECM, call some yards or go here to check yards around the country. It also does an automatic interchange for you. edit, I found them for $20 at the link below.
http://car-part.com/index.htm

 

the injectors get their trigger from the distributor pulse reference wire to the computer. if the computer isn't getting the pulse signal then the injectors will not work. this should be the pink w/ white stripe wire from the four wire connector.

 

That should be a purple/white wire for the referance. You are correct that a lack of the referance pulse and the injectors will not fire. The ECM also won't trigger the fuel pump either.

 

Well, the ECM and Chip are good.
It worked perfect in my friends 91 Trans Am.
She has a modified 383 and my ECM with a stock Chip made her car run really good, much better than the chip she has in her car.
Also the SLP Chip I have runs great in her car.

I suspect a wiring problem or the Distributor Module is plugged in backwards or not getting a good connection.

Um, I also have an MSD-6A with a Blaster 3 Coil in my car. These two parts are brand new and I wired them up the car myself using the instructions that came with the MSD-6A.
I am assuming the MSD setup is working since the car will run with Starter Fluid.

And my tach works, car gets up to 1000rpm before the starter fluid runs out.

I still need to know which wire goes where on the Distributor module, I am not sure if I put them in the right place.

I'd like to get the car running so I can go out and play this weekend with her.

 

I had a no-start recently that was caused by a loose connection in my MSD-6A harness; double-check your connections. If you bought the integration harness, try removing the MSD.

 

If the MSD wasn't working would the car still run with starter fluid?

And I hard wired the MSD to my car.
If it ever dies, I am going with Jacobs Ignition.

 

Going by what I have read and the FSM you need to verify that throttle position sensor is not reading over 2.5 volts, that would set fuel into clear flood mode. You obviously have spark, but no blinking light at injector right? If you have a steady light the manual states that injectors should read over 10 ohms, and you need to check injector driver circuit with a steady light for short to ground. You might go to autozone and get a "noid" light to check injector harness for blinking or steady light. If it ran before you modified the car double check what you have done.
on the dist module the 4prong plug : white is EST, purple/white is reference, Tan/black timing set bypass, black/red is dist. ground. The 2 prong conn goes to coil.

Hope this helps.

 

Thanks everyone.
I got the car running yesterday. The problem was that the 12v Ignition power to the ECM wasn't attached. It only had the constant 12v.

Now all I need to figure out is why the ALDL connector isn't working. It is hooked up the way I was told to hook it up.
As well as the SES light.

Wiring is a B!tch.

 

The ALDL wiring goes through C207 for the SES light and other things.

 

Hey John,
I couldn't find a smalll white box behind the radio, but I did find a baby blue box with a small cicuit board inside if it. One of my schematics had the wire colors as well as the letters on the connectors, and this blue box matched the wire colors and the letters on the connector. Only thing is, there was only one yellow wire coming off of it, not two.

I did test the the connector on the ECM for the SES light with a test light, and it did turn on, but it didn't turn off with the key on.
Does the car need to be started for the SES light to turn back off, or will the SES stay on when the car is in the ON position and not started.
It's been such a long time since I had an SES light in the car, I just can't remember anymore.

Thanks

 

Yes, that's the light driver module. Get rid of it and splice the yellow wire to the striped one coming from the computer.

Yes, the SES light will stay on as long as the car is not started.

 

Ok, I hooked up the striped wire to the yellow one and my SES light in the dash doesn't light up.

it's the white with green stripe on C207, right?

 

Yes, correct. Is the bulb good? Is it getting power? The ground that lights it comes from the ECM.