94LTZ

iTrader: (5)

Im doing the LT1 to LSx swap using a factory LS1 harness from a 2000 T/A and 2001 Z28 computer. I followed two different wiring conversions ( both matched up perfectly) and can't get the car to start.

First it would just turn over and over, then i fixed the wiring going to the crank sensor, then i got the injectors to pulse but no spark ( have power to all coils) check the wiring to the cam sensor, checked good and when i went to start it again no SES light and pump wont prime, checked the 5v refernce going to the relay and now there is no power.. checked for power going into the computer, still showing over 12v. tried a jumper from another 5v source and still nothing, that connection is also showing no voltage..

Im at a loss on why all of a sudden i have no power leaving the computer, i have tried two different computers and getting the same out come.

94LTZ

iTrader: (5)

over a 100 views and nothin lol, any ideas guys?

94LTZ

iTrader: (5)

????? Help.

68BBChevelle

iTrader: (12)

When i did my swap i was having same cranking issue with no spark. Problem was my ignition relay was dropping out power while cranking. Applied 12v while cranking fired rate up.

the_merv

iTrader: (88)

Do you have 12v ignition(key on) staying on at PCM Blue 19?

Did you bypass the Starter Relay on the car behind the Glovebox?

94LTZ

iTrader: (5)

Yes i do have 12v on the key, but did not do any bypass behind the glove box.

the_merv

iTrader: (88)

I had the same problem you do, bypassed that relay, fired right up.

94LTZ

iTrader: (5)

Ok so after searching i figured out why i wasnt getting the fuel pump and SES light to kick on, so got those back and the starter does its thing but still wont fire up.

Merv if i read your swap guide right about the jumper your talking about isn't it for the starter to engage?

I can smell fuel so im pretty sure the injectors are cycling but no spark, every once in a while it acts like it got a second of spark but wont take off.

SChamberlin5150

iTrader: (1)

Stupid question but do you need the security taken out of the computer to do a swap like that?

94LTZ

iTrader: (5)

I dont think so, my computers are stock but i might be wrong.

Agent_Orange_Shuvel

iTrader: (8)

Pretty sure you are gonna have to turn off the anti-theft in the pcm before it will start, I'm not sure what it actually disables tho

the_merv

iTrader: (88)

VATS disables the Injectors. It'll fire for like a sec to give you hope, then die.

As funny as it sounds, it will crank with that relay inline, bypass it and it will start. Don't ask me why.. Just works.

Not saying this is your only problem, but it seemed to be mine, and a few other cars were the same.

94LTZ

iTrader: (5)

Ok thanks man, ill try it tonight and see what happens.

runtwrestlin

iTrader: (3)

THat's most likely the problem though. I had to change the security when putting a 98 LS1 into my 97 Camaro. The BCM has to be relinked to the proper VIN of the PCM, or else it won't send the correct security signal to allow the PCM to enable continuous fuel delivery.
If you have HPTuners, or know someone with a tuning program they can take care of it very easily for you. Here are several links about the VATS: VATS1, VATS Bypass With Resistor.

Themerv's idea is simpler though.

94LTZ

iTrader: (5)

Well got even closer but still not starting, i jumped the relay from pin 30(thick purple wire) to pin 87(thick yellow wire). I tried it with the relay in the socket and out of it with just the jumper wire. It tries to start but just wont take off. Thinking i need to get the computer tuned, i bought it off ebay (12200411) and was told it was for a LS1 Camaro M6 but i just noticed today that the tag that was taped to it said it was from a Chevy truck..

Not sure if DLAC or DFNN means anything on the computers but on computer says-

12200411 DLAC and the other 12200411 DFNN

Thanks.

94LTZ

iTrader: (5)

Well it started tonight, i went over the wiring so much i knew it had to be right so i took both my computers to my tunner and figured it out. We found the neither would start a known running car and he tried what he could but came up with nothing but he had a brand new 411 computer on the shelf so we threw a Vin at it for a 01 Z28 M6 and tuned it and deleted VATS.

Was glad to hear it run finally!