I have converted my 85 to a 165 ecm. I used Traxion's instructions using a low profile zif socket and a flashable 256k chip he recommended. I burned the chip usingmy pocket programer.
When I try to start the car I have fuel in the fuel rail with 50lbs of pressure and I can adjust the pressure up and down. I also have spark at the plugs and 12 volts +or- at the injector harness but the injectors do not fire. I also can read to ground through the ground side of the injector harness even with the key off.(Is this normal?) I would like to know what direction the "pin one" notch on the new chip should be orienred on the carrier.
I would appreciate any insight I can get on why my spark plugs remain dry and my SVO 30lb injectors don't tick(fire) when fuel pressure is in the fuel rail and 12 volts and a ground are available at the injector when cranking.
Thanks for any information anyone here can provide.
HLV
t2k

 

When you switched over to the 165ecm, did you change the injector wires? You need to do some splicing of the injector wires if you haven't.

 

Yes I spliced in everything and repined to the new plug locations as required. The car did run before I installed the zif and the flashable chip. I even tried the original OEM chip in the zif and still no go.
t2k

 

The number one pin faces the outside of the memcal. Have you verified continuity on all of your chip pins?

Do you have electric fans? If so, when you key on, does the fan turn on? If so, you likely have a soldering problem in the memcal (I had this).

If everything seems OK with the memcal, I'd suggest looking at things with a scan tool. You may not be getting reference pulses from the distributor...

 

What would be the result of having the chip installed in reverse #1 pin facing in? Yes, the fan comes on when the key is on. Oddly, the at29c256 programed and verified successfully with pin 1 180 degrees out of phase.
I am reprogramming the chip and reinstalling. I will find out if this turns the fan off. If not I will try to redo the zif socket sodering.
I will advise asap.

Thanks
HLV
t2k

 

I checked the zif on the carrier and there are no shorts pin to pin and all pins read from zif to the corresponding pin on the carrier. Should the zif pin 1 be inserted in the pin 1 of the carrier or the first row of holes on the carrier? If this is correct, I have two rows of empty pins between the last used zif "pin 14" and the first pins in the next chip on the carrier, or should there be one empty row on the carrier at each end of the zif socket?
Thanks for your input.
HLV
t2k

 

Did you get a longer than needed ZIF socket for the 165 memcal?
You'll have to make sure the flash chip lines up correctly with the orignal pin slots on the memcal, assuming those are lined up you will want to reprogram your flash chip again.
Did you low the bin on the top half of the 256k flash chip? mem locations 4000-up?

Brendan

 

Also make sure when programming that the chip is in the programmer properly. It will say it programmed fine even if a pin is bent or not quite making contact. A way to test if the chip did get programmed would be to try and download the info from the chip and then read it in your editor(ie. tunercat)

Brendan

 

Hi,
I got the standard low profile zif and placed pin one where I thought it ought to be in the carrier. I reloaded the bin APYP-6E.bin. It is loadable and I can edit it after downloading from the new chip. I think my problem is in the wiring harness. I disconnected from the ecm and the HEI module in the distributor. I can still read from one side of the injector harness to ground. This I think would be causing the reference signal to fail and not fire the injectors I think. The harness is pretty old and I melted some wiring in it around the time of the ecm upgrade. Anyway, I disconnected the injectors from the harness and I still read a short to ground on one side of the injector harness pins on each injector connector.
I bought a used harness from a fellow on the corvette forum a while back, and I am trying to determine if it is worth installing. I am trying to ID all the connectors before removing the original. At least at this point I don't think my problem is in the chip or my DIY prom burning.


Thanks again and HLV
tsk

[This message has been edited by texican2K (edited October 08, 2001).]

 

I have worked on two cars that would light an injector noid light constantly meaning that the signal wire was grounded. One had the signal wire rubbed through and touching ground and the other had a shorted injector driver. Pretty much the only things it could be.

 

Did you disable the VATS?

 

Thanks Guys,
I have the harness disconnected from all the injectors and the ECM and it is still reading to ground. I will check both B-5 and B-3 at the ECM end for a ground at that end this evening.
HLV
t2k