BobH

iTrader: (4)

Just about done wiring LS2 T56 combo in a 68 Camaro. I used the E40 computer with a J1 connector from EFI. I wired the OBD port with the orange wire to batt source (constant) and two blacks to ground. Hooked up check engine brown wire to light and ground.


When I move the ignition to the on position should the ck light illuminate??? ( as in my daily driver). Haven't tried to fire car up yet waiting for a few small items still.
Thanks
BobH

EFIHARNESS

The other side of the mil light goes to ignition not ground. Steve

BobH

iTrader: (4)

Thanks !! Steve

Would that be Ignition as in 12v ign trigger? The PCM provides the ground ?

I'll check it tomorrow
BobH

EFIHARNESS

yes the pcm provides the ground trigger to set the light. Other side goes to ignition load with all the coils, injectors. Etc

oldgoat69

Here is a pinout.

BobH

iTrader: (4)

Thanks guys... Hey on the pinout #16 , the 12v from ignition side is the correct hook up?? or is a 12v battery hook up?

Thanks
BobH

BTW EFI , my LS2 (E40 computer) FI/Coils is through connector 101 and receives batt 12v directly from underhood power center. Just checking because that is the way read the diagram. Is that incorrect?

ls1nova71

iTrader: (4)

#16 is 12v constant (battery) hook up.

EFIHARNESS

#16 in obd connector is constant 12v+. not switched.
Bob , Just looking @ the E 40 pinout I see that coils and injectors go to the load side of the powertrain relay not to battery +. Steve

BobH

iTrader: (4)

Thks Steve,
I didn't use the powertrain relay. I used the original 68 camaro starting circuit. The American wire harness had a 12v Batt and 12v ignition built-in which I wired to e40 .
I then made a small fused circuit panel under hood to power FI/COIL ,rev l/o and fans. Simular to the factory arrangement.
Thks
BobH

ls1nova71

iTrader: (4)

If it were me, I would put the ignition relay in it. Running the whole EFI harness through.the ignition switch probably isnt a very good idea. Not sure what a 68 Camaro ignition switch is rated at, but cars didnt have much load on them back then. I know ive seen melted connectors on ignition switches of many 67-72 trucks. Relay would take the load off the. Switch. Just my $0.02.

EFIHARNESS

What Nova 71 said is correct. The early stuff did not have 8 coils, 8 injectors,
O2's, maf, trans, ecu, etc. Steve

BobH

iTrader: (4)

What Nova 71 said is correct. The early stuff did not have 8 coils, 8 injectors,
O2's, maf, trans, ecu, etc. Steve
Yesterday 04:30 AM


Thank You. Point well taken and appreciated. I will look into the Ignition relay. Any ideas where to wire the relay?
Thanks
BobH

ls1nova71

iTrader: (4)

Use the wire you're powering everything up with now to power your relay, on pin #85, then pin #86 to ground. Then put a fused constant power to pin #30 and the other side pin #87 to your fuse box powering up your harness.

HwyStarJoe

Been running the LS2 (E40 and OBDii) for over a year wired up the way you are with no relay and haven't had any issues with ignition, starting, etc. The harness is from the car the engine came out of, powered through a Painless fuse panel, right to the '69 harness (that's in perfect condition).
I suppose I can throw a relay in for giggles.

ls1nova71

iTrader: (4)

I'm not saying it won't start or run without it, what I'm saying is you are potentially overloading your ignition switch. You may never have a problem, but it could be a car-b-q waiting to happen. Ever seen a car burn down on the side of the highway? Odds are that they didn't know they had any problems either until it was too late. A relay will take the load off the old switch, so it's kind of an insurance of sorts.

Take it from someone who watched in horror as their own car burned, it's not a good feeling. It was on my Nova, It was all stock at the time and to this day I don't know what caused it, other than it was the wiring on the firewall, but I got it out in time, I was lucky.

HwyStarJoe

I hear ya!
I need to do some cleaning up of the wiring anyway before cruising season starts again, so this is now on the list.
Thanks!

BobH

iTrader: (4)

The way I am currently wired is 12v from car harness to the computer, only 3 wires. The FI/COIL are wired to a separate direct 12v from batt to a fused panel in engine compartment.( also contains fused and cb electric fans) I am not running an over abundance through the 12v ignition wire at ignition switch.
I am missing anything that is a high draw item in the LS2/T56 harness that comes off computer power? Fuel pump comes off 12v fused and relay through American Auto Wire harness.
Appreciate the information,
BobH

ls1nova71

iTrader: (4)

I'm not sure I follow what you're saying. I think you may be a little confused, because if you had your fuel injectors and coils wired to "a separate direct 12v from batt to a fused panel in engine compartment" as you state, two things would happen, first, since it's wired to a direct 12v source, you wouldn't be able to shut the engine off, and if by chance you did get it shut off, it would drain your battery. What harness are you using for the engine? Aftermarket or factory?