socorob Posted July 22, 2014 Share Posted July 22, 2014 Finally got it wired enough to start, or so I thought. Fuel pump comes on and engine cranks over but never starts. The only thing I dont have hooked up is the IAT sensor, since I dug everywhere for an hour and couldn't find what I did with it. Does it have to have the iat connected to start? Quote Link to comment Share on other sites More sharing options...
mattd428 Posted July 22, 2014 Share Posted July 22, 2014 Could keep from running but usually you will get it to start then die. If it's just cranking and cranking make sure the on crank run wire is getting power in the crank on and run position. Seen several people give that wire power in only the on position. Quote Link to comment Share on other sites More sharing options...
socorob Posted July 22, 2014 Author Share Posted July 22, 2014 Thanks ill check that out. Quote Link to comment Share on other sites More sharing options...
Domzs Posted July 22, 2014 Share Posted July 22, 2014 IAT sensor won't keep the engine from running . Check to see what's missing , like spark and fuel . VAT removed ? Quote Link to comment Share on other sites More sharing options...
socorob Posted July 22, 2014 Author Share Posted July 22, 2014 I sent the computer off to get all that removed from lt1swap.com, so I hope it's right. Hopefully I will have some more time on Wed to look into it some more. Quote Link to comment Share on other sites More sharing options...
socorob Posted July 22, 2014 Author Share Posted July 22, 2014 Could keep from running but usually you will get it to start then die. If it's just cranking and cranking make sure the on crank run wire is getting power in the crank on and run position. Seen several people give that wire power in only the on position. http://lt1swap.com/2004gto_pcm_pinouts.htm Would that be pin19 on blue? Quote Link to comment Share on other sites More sharing options...
Meatwad Posted July 22, 2014 Share Posted July 22, 2014 I've experienced this problem when doing a 5.3 swap into a Porsche. The computer had security programmed into the PCM. Had to get it tuned out. Quote Link to comment Share on other sites More sharing options...
Meatwad Posted July 22, 2014 Share Posted July 22, 2014 (edited) I've experienced this problem when doing a 5.3 swap into a Porsche. The computer had security programmed into it from the factory. Had to get it tuned out. Edited July 22, 2014 by Meatwad Quote Link to comment Share on other sites More sharing options...
mattd428 Posted July 22, 2014 Share Posted July 22, 2014 I believe so. Dom would know. On a the truck harness you have 2 constant hots and 1 on crank run. I believe the on crank run wire is pink. Quote Link to comment Share on other sites More sharing options...
socorob Posted July 22, 2014 Author Share Posted July 22, 2014 Aren't the orange always hot and the pink switched 12v usually? I had to go pick up an IAT sensor this morning, but I don't think I will have time to work on it this evening. I may have my pinks to just 12v when on, not when cranking and on. Quote Link to comment Share on other sites More sharing options...
EvilC Posted July 22, 2014 Share Posted July 22, 2014 You can find a black wire with white stripping as your 12v+ during cranking(usually found near fuse box/pamel on our Datsuns) to hook the pcm to (pink wire of GM computer). Quote Link to comment Share on other sites More sharing options...
Domzs Posted July 22, 2014 Share Posted July 22, 2014 If I know what yr GTO , I can look it up for you . Type of transmission . Quote Link to comment Share on other sites More sharing options...
socorob Posted July 22, 2014 Author Share Posted July 22, 2014 Its an 04 GTO t56. Figures it would be that wire. I think that's the one that fed the Datsun coil. I removed it along with a crapload of other wires that were no longer needed. I guess I will have to put it back. Quote Link to comment Share on other sites More sharing options...
socorob Posted July 22, 2014 Author Share Posted July 22, 2014 I have 3 pink wires, 1 from the current performance box that needs a switched 12V, and a solid pink and pink with a stripe (cnt remember which color) that I all tied together and have switched power to, but not sure about start. Quote Link to comment Share on other sites More sharing options...
Domzs Posted July 22, 2014 Share Posted July 22, 2014 OE or AM harness ? Quote Link to comment Share on other sites More sharing options...
Domzs Posted July 22, 2014 Share Posted July 22, 2014 OE wiring shows : C1 connector ( no sure what color ) , pin 19 = ORG = 12v when key on/start , pin 20 and 57 = ORG = 12v all time . Quote Link to comment Share on other sites More sharing options...
socorob Posted July 23, 2014 Author Share Posted July 23, 2014 I ran by there and checked. Had it hooked to 12v only with on and not run. Moved the wire and it fired right up. Thanks y'all! Quote Link to comment Share on other sites More sharing options...
mattd428 Posted July 23, 2014 Share Posted July 23, 2014 Bam!!!! I am all that is man bahahahahaha! Quote Link to comment Share on other sites More sharing options...
socorob Posted July 23, 2014 Author Share Posted July 23, 2014 Yep you nailed it. Quote Link to comment Share on other sites More sharing options...
NgoZ Posted July 23, 2014 Share Posted July 23, 2014 Nice going Rob. I need to find some time to visit lol. Quote Link to comment Share on other sites More sharing options...
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