ls3 conversion not crank situation

[timopajala]

Hi, im in the point of starting my car for the first time and tested today the electrics and my starter wont engage at all. I have original wiring and psi conversion ECM, throttle works great and fuel pump primes ok. Also my MIL light wont light up at all, does it light after it starts or should it go in after power is switched on? Is there something that could prevent the starting like safety switches etc?



PSI conversion quys told me that those are eliminated but how could i make sure of that? If i would connect wire straight from the igniotion thru a relay to the starter solenoid will it start then?

[badazz81z28]

If wired properly, it should crank. A no fire could be cause by the power wire you tapped into. The check engine light should illuminate right when you turn ignition on and go out when the engine fires. Btw, the starter should not be wired into the PSI harness. That should be wired just as it was with the stock engine using the factory wiring. Did you override the neutral safety switch coming out of the ignition switch? Just bypass it by eliminating the safety switch and joining the two wires. Should be thick purple wires.

[timopajala]

i have original wiring from stock harnes, only PSI ecm, i have manual trans and the safety switch should be overrided by the ecm tuning by psi conversions. I forgot to mention that the car is 1967 camaro. Original ignition lock also. I tracked the starter wire by lti1swap wiring info. I think i have the ignition and crank wires soldered to the wrong wires, gonna double check them next weekend. I had to cut them from underneath the original fusebox and hook my ignition wires there, i might have soldered them to the wrong end of the wires i cut :D so the ends that need the power are not hooked to anything right now :D

Well after i thought this thru the power on wire has to be correct because the fuel pump primes when i turn the ignition on, so that wire had to be correct, i hooked the starter wire straight to the ignition lock so gonna check that it did not get loose etc. If its not working im gonna wire it straight from ignition lock to relay and from there to starter solenoid.

[badazz81z28]

No, the starter should not and does not work by any means with the ECM. The starter should be wired the same way if it was a SBC. The starting system on your car is totally independent from the LS harness. In reality your ECM could be dead as a door nail and the engine will crank.The same with the ignition switch. The neutral safety is a thick wire coming out of the ignition switch on the column to either the pedal switch or a switch on the shifter back to the ignition switch. A closed circuit will allow power to the starter when turning the key. If this circuit is open nothing will happen when you go to crank. As for your ECM power, the ignition power must be constant even when the engine is being cranked. Just because your ECM powers on when you turn the key, does power remain while cranking. Many circuits don't. That's why it's particular which hot wire you use.

[timopajala]

Thanks! Ill check the starter wiring and make it like it was originally. Gonna hook it thru reley so it wont draw so much current thru ignition lock. Im sure that the ignition wire is ok, i took it from the original distributor wire and the same wire worked on my LT1 engine before this swap. The starter is wired wrong and gonna change the wiring from there.

[icemanrd19]

Purple wire to the starter cranks the starter. Has nothing to do with the ecm your using. Where is your safety switch? 67s didn't have them. I adapted a 69 safety switch and attached it to the clutch.

[timopajala]

Purple wire to the starter cranks the starter. Has nothing to do with the ecm your using. Where is your safety switch? 67s didn't have them. I adapted a 69 safety switch and attached it to the clutch.

I didnt mean that the ecm operates the starter, i have the original fusebox from 2013 camaro and i put wire from my ignition lock to the fusebox starter reley and it did not work. I think that reley is not for the starter even the fusebox manual sais it is. Im gonna make the starter wiring like it was originally in my 1967 and put a reley in between the wire

[andrewb70]

I didnt mean that the ecm operates the starter, i have the original fusebox from 2013 camaro and i put wire from my ignition lock to the fusebox starter reley and it did not work. I think that reley is not for the starter even the fusebox manual sais it is. Im gonna make the starter wiring like it was originally in my 1967 and put a reley in between the wire

Don't need a relay. Purple wire to the starter. Keep it simple.

Andrew

[icemanrd19]

Don't need a relay. Purple wire to the starter. Keep it simple.

Andrew

Speaking of i went too goodguys a few weeks back. Parked the car after a long drive and it would start. Thought the starter was hot from the headers. After sitting for 10 min i cranked it and starter it. Got home to make my heat shield and noticed the purple wire was 3 full turns loose lol. Keep It Simple Stupid K.I.S.S lol.

[timopajala]

Don't need a relay. Purple wire to the starter. Keep it simple.

Andrew

Thanks!

[timopajala]

Just wanted to thank everyone who helped me with this, everything is ok and car cranked and started fine after the wire change. I had little bit odd trouble at the first start, it fires fine and idles but when i touch the gas pedal it started running like 2 cylinder was off. It did that few times in a row, i disconnected the battery and let it settle a while and after that i turned it over again and it run like a champ! Also it has wavy idle at the moment but i have exhaust leak in the passenger side so that might do something also. Gonna hook scanner today and look for codes if there are any.

Will torque app work with e38 pcm ok? I have mini elm bluetooth reader

[timopajala]

Well my problems are not over yet. Today i vent and tryid to make connection to pcm but no luck. Car is acting really weird, it idles little rough and as soon as i press gas even a little it starts to shake like hell and sounds its got choke on and flooding the engine. Also terrible fuel smell after that..what could be the issue to that? Leaking injectors or tps TPS sensor or something else? I cant connext to pcm dor some reason so no diagnostic available currently

And i forgot to mention that the engine was in storage for 2 years so might the injectors be clogged? If one is clogged will the ecu try compensate the lean condition by injectin more fuel to the other cylinders?

[timopajala]

I have reserched the problem and might have this problem: i made the harness my self from the original wire harness and when we traced the wiring etc we removed the EMI shield tape from the throttle body sensor harness and also from the obd2 wiring. I ordered new copper emi tape and gonna wrap the wires again and see whats gonna happen after that.

Theres just one odd thing, the car worked for a while great. We pulled the battery cable of and it started acting up after that, there still might be clogged injector/s because the engine has been storaged for 2 years

It idles great but as soon as i touch the throttle it starts to shake like grazy and feels like it wont fire on all cylinders

[dhutton]

Did you pull the battery cable off the battery while the car was running?

Don

[timopajala]

Did you pull the battery cable off the battery while the car was running?

Don

No, not when running.

[andrewb70]

Just wanted to thank everyone who helped me with this, everything is ok and car cranked and started fine after the wire change. I had little bit odd trouble at the first start, it fires fine and idles but when i touch the gas pedal it started running like 2 cylinder was off. It did that few times in a row, i disconnected the battery and let it settle a while and after that i turned it over again and it run like a champ! Also it has wavy idle at the moment but i have exhaust leak in the passenger side so that might do something also. Gonna hook scanner today and look for codes if there are any.

Will torque app work with e38 pcm ok? I have mini elm bluetooth reader

With the exhaust leak, the sensor is reading an artificially lean mixture so the ECU is adding a ton of fuel. You need to get the exhaust leak fixed before doing anything else.

Andrew

[timopajala]

With the exhaust leak, the sensor is reading an artificially lean mixture so the ECU is adding a ton of fuel. You need to get the exhaust leak fixed before doing anything else.

Andrew

Ok, gonna work that leak first and put some injector cleaner in tank and try again Thanks for the response!

[timopajala]

Well after i fixed the leaks and put injector cleaner in the tank the car is idling and responds to throttle. Theres some minor issues, i have check engine light on constantly and were unable to connect to the ecu. I checked the obd2 wiring and i noticed that there are two ground wires hooked together, signal ground and chassis ground, are they supposed to be on the same ground? While we were checking everything my brother noticed that my maf was unplugged on the second time we tested the throttle and there was no change to engines operation if it was plugged or not, is the maf sensor broken?

[andrewb70]

Well after i fixed the leaks and put injector cleaner in the tank the car is idling and responds to throttle. Theres some minor issues, i have check engine light on constantly and were unable to connect to the ecu. I checked the obd2 wiring and i noticed that there are two ground wires hooked together, signal ground and chassis ground, are they supposed to be on the same ground? While we were checking everything my brother noticed that my maf was unplugged on the second time we tested the throttle and there was no change to engines operation if it was plugged or not, is the maf sensor broken?

The engine will start without the MAF. Remember, when the engine is cold, it is in open loop. Without the MAF, it just reverts to a speed density tune.

Sounds like you're having multiple issues...

Andrew

[timopajala]

The engine will start without the MAF. Remember, when the engine is cold, it is in open loop. Without the MAF, it just reverts to a speed density tune.

Sounds like you're having multiple issues...

Andrew

Today we traced the data wires and confirmed that they are ok, we tried the obd2 reader on my friends car anf it did not work so thats why we cant connect to ecu. We started the car today and it run much better then before. No more wavy idle etc, might been clogged injector or something. Ordered new obd2 reader and waiting if we will connect the ecu with that. The mil light still stays on so need to find a way to connect and read the code/s