Problem: after droping in new engine and tranny, the engine wont start. I am not getting any fuel,,, none of the injectors are opening. I do have spark, and fuel pressure of 58psi.

I think that I may have pinched some of the wires going to the distributor. Is there a wire in the 4 wire connector or the two wire connector that has something to do with the pulse sent to the injectors?????

This is my '87 IROCZ.

 

Hello Doc,

The only wire inside the distributor cap that could get pinched is the wire for the pick-up coil to the ignition module. There are two wires that go to the ECM that could cause a problem. A white wire that goes from pin "D" of the four wire connector to pin "D4" of the ECM for the EST. A purple/white wire that goes from pin "C" to pin "B5" of the ECM for the reference pulse. BTW, did you change fuel delivery systems with this new engine? TPI to carb and so forth?

 

This car has always been a TPI car that I have "burned" Eprom chips for.

If I looked down the holes of the female end of the connector, pin C and D would be the 3rd and 4th holes. Is that correct?

Anyway, your saying I should check the purple/white and the white wires of the four pin connector.

I believe that the purple/white wire was one that looked pinched.

Thanks for the tip!!!!!!!!!!

 

As I mentioned earlier, the purple/white wire is the reference pulse wire and yes pin "C" & "D" would be the 3rd & 4th wire. The connector should be marked and can only go in one way.

 

This car is such a piece of ****!!!!!!!!!!!!!!!!

I have lowered the fuel pressure to 43psi, engine will not start.

I've check the connectivity of all 4 wires on the 4 wire connector on the back of the distributor, engine will not start.

The ECM flashes the 1-2 sequence and no error codes.

All ground wires are bolted to the back of each head.

I bought a noid test light for the fuel injector connector, no light,, so no pulse width being sent to the injectors.

This is just as I suspected, I am getting no fuel, but WHY!!!!!!!!!!!


I think its time to buy some dynomite and blow this car up!!!!!!!!!

 

Do you have 12v at the injectors? if so then it can be put back to the ECM grounds or something there.
Just a little help before the destruction begins

 

Since you mentioned in an earlier post that you have always burned eproms for the car, have you checked the chip to make sure that it has the right information on it. Just a thought!!!!!!!! Another thought here is have you checked the injector fuses or the wires running from the fuses to the injectors?

BTW JP86SS, if the NOID light he used to test the wiring harness doesn't light, it means that he isn't getting any pulses (voltage) from the ECM.

 

No I meant that the injectors are grounded through the ECM and there should be 12v at them even if they don't fire.
If there is no power, than it is on the supply side (fuse, wire, etc)


Edit: Noid won't light if no current flow.

 

I have more info:

Both terminals on the #1 injector harness have 12.5V with key on. While cranking, my noid light does not light up.

Both terminals of the 2 wire connector on the back side of the dizzy have 12.5V with key on.

The purple/white wire in the 4 wire connector at the dizzy does not have power with key on. If fact, none of the wires in this 4 wire connector have power with key on.

Is this my problem???? And if yes, then what do I do about it?

Can I run my own 4 wire loom from the ECM?

The purple/white wire apparently connects to the B5 at the ECM.
Should I replace just this one wire?

Trickster: I did swap out the entire MEMCAL unit for another one, no help here.

 

Another thought I figured I'd throw your way,
I was jumpering power to that wire on mine to see if it was connected properly.
Whenever I gave it a quick pulse, the fuel pump would come on via the ECM.
If that performs correctly there should not be a need to replace it (unless you fear there is other damage to it that may appear later)
I don't believe you would see any power at the connector without the distributor turning.
Also, C11 and C12 are the connections for the injectors at the ECM, check if they are in good and then move to checking the grounds at A12, D1, D6, D7, and E16.
Not sure but I think the "D" grounds are paths for the injectors but not 100 % on that.
FYI, this is on my 90' schematic. Trickster probably has the 89 and could positivly id those.

 

On his car the injectors are at pin "D15" & "D16" on the ECM. His ECM grounds are pins "A12", "D1", "D3", & "D10". With the key on, you should have system voltage at pin "D15" & "D16" of the ECM connector. So disconnect the ECM harness and check those two pins for voltage. BTW, with the key in the on position there is less than .5 volts on that purple/white wire from the ignition module to the ECM. With the engine running there will anywhere from .6 volts to battery voltage depending on position of drive wheels.

 

I thought there was a difference on the 89, Sorry for the confusion.
Thanks for getting the correction on that Trickster.

 

IT LIVES!!!!!!!!!!!!!!!!!!

The final test that I ran was to connect a noid light to #1 injector harness, and connect a test light from positive battery to the purple/white wire at the dizzy with the key on. If the noid light flashes as I connect from battery to P/W wire, then the dizzy module is bad. So I replaced my MSD pro-built dizzy (part #8366)with my factory original 1987 dizzy and the engine fired right up.

Can you believe it!!!!!!!!!!!!!

 

Cool !

 

I want to thank everyone who helped me on this matter, and sorry about venting.

The engine runs smooth and fine above 1500 rpm. Now I need to put some miles on the engine before I expect it to idle smoothly.

Speaking of idle, does anyone have any suggestions?

As mentioned elsewhere, I do 'burn' Eproms for this car. What are some things that I should look at in the 32B ECM? I have CATS for tuning.