Ok, well I got the ecm wired up just like it says in the tech article its an ecm. But no go. I will just crank and not fire. i am pretty sure it is a fuel issue as the fuel pump wont even prim when i turn the key to acessory. What does VATs stop? fuel or spark? I cant remember. Maybe I didnt re move it properly. I think the next thing i will try is just to use the 87' puter i have lying around. if it works, i know it has somthing to do with the ecm or prom. if not I need to go through the wiring again.

 

VATS will shut down fuel injectors.

Car will crank and fuel pump will prime(might be wrong on the prime).


What exact mish mash of parts and masks are u running now Mike?

later
Jeremy

 

I have an 89' 165 w/ 6E. It cranks but it doesnt fire. no fuel pump prime. I have another 165 ecm from an 87' w/ a stock unmodified 305 memcal in it. It should have 32b right? Anyways, it will narrow down some things if it works with this other ecm. I wonder if I screwed up somthing when I modified my memcal.

 

The 89 and 87 ecm's are identicle, the difference is in the chip, just swap the memcal and it should work

 

well, does my problem sound like a vats problem or does it sound like i screwed up my memcal when i modified it. (desoldering chaip and soldering in zif)

 

What does your SES light do when you go to Key On Engine Off?

 

Good question.... I need to take the electrical tape off of that light

 

I'm gonna bet on memcal issue.

Carefully go thru all the pins/solder connections one at a time.

My first couple took a couple tries to get right , just like my first adapter socket on 148's.

Just go back over what u did with a fine toothed comb and it will prolly reveal itself.

later
Jeremy

 

Well, after I plug in the chip from the 87' I will know whats up. Stupid me already used hot glue on the memcal.. Im not so sure how easy it will be to check solder conections I guess if i have to I can get that stuff off w/ a razor blade

 

Well, I pluged in the untouched 87' 165 and still no fuel pump! I guess that means the problem probably lies in the the wiring. I better go through it again. Here is the pin diagram. http://www.eecis.udel.edu/~davis/z28/ECMs/85to86.txt
There apears to be only one pin (B2) directly involved with the fuel pump. I am pretty sure this is wired properly. are there any other points in the wiring critical to the fuel pump priming like it should?

 

I see your problem.
My info indicates that "B2" is the voltage feedback to the ECM (Not the pump relay drive). It is an analog input on the 165. Indicates the pump has voltage when the relay is engaged.
Pin "A1" is the output to drive the relay.
Should fire with that fixed.

 

hmmmm.... isn't A1 for the fuel pump relay? Wouldnt somebody have said somthing about it by now if the tech article was wrong in saying to hook up to B2? Also... shouldnt the fuel pump prime anyways regaurdless if the maf power relay and maf burn off are hooked up right?

 

Tech article doesn't say anything about it (that I see anyway).
I'll look again to be sure.
What was the stock location for the wire to your FP relay?
Several places reference the "A1" for the FP relay on the 165.
Its also on the 730-165 conversion list that way.
I run 730 so I can't confirm it physically on my setup but if you have not had any prime by just turning the key on then its probably the problem.
That would be irregardless of what else was hooked up.
The circuit should also be going through the oil pressure switch (in case the relay went bad) the engine would crank until oil pressure built up and then the pump would be turned on.
Recheck the wiring, the pump should be coming on one way or another.

Edit: Tech article is correct. It says FP "Signal" not relay.
Do "A1" for the relay, feedback from downstream of the relay (pump feed wire) to "B2".
then fire it up (hopefully if that was the only problem)

 

Yep, I got that one correct.
See this sheet from the conversion http://www.eecis.udel.edu/~davis/z28...165v8tpi-4.jpg

Should be good to go by making that fix.
Jp

 

did you look at the figure for the pin changes in my post? that is is from the tech article and it says to connect "B2" to maf power relay "pin c". I have never touched "A1" it goes to the fuel pump relay on both the 85' and the 89' it has NOT been modified.

 

You are correct and the drawing confirms that but "B2" also goes to the fuel pump and fuel pump relay"A".
Power does not go out of "B2", it is an input.

Pin "C" on the relays is what gives the coil power to turn on the relay if it is already grounded on the other side (FP relay and MAF pwr relay). If the relay is not grounded all the time like with the burn off relay, the ECM grounds it to fire the relay(D12)

The FP power comes from the relay contact "A" OR the oil pressure switch.
The "drive" to turn on the FP relay comes from "A1" and from what you said it should be there. See if you have power on the "E" terminal of the FP relay and also at the pressure switch. Might have gotten mixed up in the swap or something.
Just taking it from an electrical point of view (not going step by step through the conversion doc)
I would check:
a.) that I had power coming out of "A1" for about 2 seconds when the key is first turned on.
b.) See if the FP relay is operating (should hear it click on)
Could also jump power to the "C" term and confirm operation that way.
c.) Do you have the fused power at the FP relay term "E".
d.) Jump power directly to the pump wire and see if the pump is able to operate at all. Maybe it just took a dump or lost the ground at the tank.
Something has to give.

If you can confirm all the wiring is good, then look back to the ECM. Try to get that 2 second pulse from "A1" by working with the memcal/chip.