need help on my first LS conversion,04 LQ9 in an 86 K5, no start

[GasGuzzler]

Never heard of the 30 min learn procedure.

Wow. I guess that means you use TIS2WEB on a GM account or with on the client server with a yearly subscription.

[vortecyota]

Wow. I guess that means you use TIS2WEB on a GM account or with on the client server with a yearly subscription.

I had a brain fart. Lol. That procedure is for the pcm to learn the fuel enable passkey and the op had inj pulse so I never considered that procedure.

Im just a trans builder and we don't reflash so no I have never used TIS2WEB. When necessary, we have a mobile guy come out. Service all makes and models so we are not interested in setting up to update cals for thousands of different vehicles. We already have plenty to stay current with.

Op- im sure your tuner disabled VATS but since you did the relearn, I wonder if that could have in effect re enabled it??? Never heard of anyone trying a relearn with VATS disabled.

[farmtruc]

We got your message, i double checked your file and vats is definitely turned off.

I'm not sure if there's anything else you needed to go over, but from the looks of it, you have a lot of help from the guys here, vs one on the phone.
It could be anything and to go over each detail on the phone with one tech vs having 5 minds going at it...

Keep posting and we'll do our best to reply with answers,
thanks,
allen

[vortecyota]

Allen, have you ever known of anyone to do a passlock relearn after VATS has been set to none? Its just odd that he had noid pulse before the relearn but not after.

Steve, now that you have no inj pulse, check for key on 12v on the pink inj wires.

[farmtruc]

you can perform the procedure, but i don't see it doing any good or change. vats is off, so it wouldn't make a difference. sounds like some sort of intermittent issue if things are changing.

i had the same issue regarding ignition crank voltage on my truck, but my truck would turn over a few times, then finally start on the 2-4 try.
my truck didn't have crank voltage going to the relay/fuse, etc. that was an ignition issue tho.

make sure all the sensors are reading correctly, make sure the crank is producing an rpm, cam sensor is toggling, map is 100kpa during crank, injectors are opening or at least commanded, can't remember the pulse value, but maybe like 10ms or so, be sure the pcm is grounded, be sure the pcm has it's battery and ignition voltage, and keeps voltage while cranking. 10volts is fine.


might wannatry this first, take all your ignition wires straight to battery, see if it starts. doing this you'll bypass the ignition ON and ignition crank voltage for now.
NOTE: engine will stay running when key is turned OFF.

[stevebbc]

I still have 12.25v on the pink wires to the injectors during crank and in the run postion. To me, this means the pcm is not setting the ground to energize the injector coils. This pcm was firing the injectors before I did the learn procedure, but not afterwards. How can I undo the learn procedure?

If I get time tomorrow, I'm going to try the previous pcm.

Thanks for the replys and suggestions, keep'm comin!

[vortecyota]

This is what has me curious about what happens when a relearn is done on a pcm that has vats disabled. Im with Allen. I wouldn't think it would change a thing, but you are the first guy I've known of to do it and now the pcm is not pulsing the injectors.

Your other pcm hasent had vats disabled has it?

[vortecyota]

Either way, if you have 12v to the injectors, a Ckp signal and obviosly the injectors are wired right bc you had pulse before, I think you need to have NP look at your tun file to see if somehow the relearn reenabled vats. I don't think that's possible, but I think this is the first time many or all of us have heard of someone doing a relearn after vats disable. I am looking forward to a conclusion to this story!

If it comes down to it, my offer still stands. Im sure I could find the culprit if I was with the truck.

[stevebbc]

The other pcm is a stand alone too and has had the vats disabled but no learn procedure. Both had the same symptoms up until I did the learn.

[RedHeartbeat]

Get a handheld diagnostic tool and read the codes that are coming up. You have to have codes if it's not starting. Have you checked all the grounds to make sure none of the ground wires a broken internally? Are they all grounded to either the driver side backside of the head, the driver side of the block down by the oil pan towards the front of the engine and the one ground that goes on the passenger side of the engine centerline, top of the block just a few inches away from the oil pressure sensor. A good source for the handheld diagnostic tool is Oreilly's where they actually rent it, take it home and use it.