Installed lsx motor with ls2 conversion, no start condition

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Jan 31, 2016 | 08:31 PM

lmt0705

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Installed lsx motor with ls2 conversion, no start condition

Just finished installing my lsx motor in my 00 ta. I used an ls2 conversion kit for the knock sensors and the relocated cam sensor. Only other thing I changed was extended my map sensor wire which looks good. Car turns over, no start, appears to be no spark or fuel either. I have hp tuners but am not really familiar with it, can it help me diagnose the problem or does someone have any ideas what to look for?

Jan 31, 2016 | 09:32 PM

Boo"SS"t

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Double check your cam sensor wiring, assuming that you had to make an extension for the wiring since it's now located in the front.

Jan 31, 2016 | 10:00 PM

lmt0705

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The motor came with an extension/adapter harness. Plug and play

Jan 31, 2016 | 10:05 PM

soloman369

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Start with basics check fuel pressure / make sure coils are pluged in/ spark plus wires / spark plugs / fuses

Jan 31, 2016 | 10:33 PM

lmt0705

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did everything but fuses, is there a way i can use hp tuners to see if the cam and crank sensors are working?

Feb 1, 2016 | 01:08 AM

hbhc

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Some of the cam extension harnesses need two of the wires swapped, from memory I believe it's the outside wires? I had to do this on my car years ago, good luck.

similar discussion at:
https://ls1tech.com/forums/pcm-diagn...-cam-swap.html

Might want to verify that you are putting the correct voltage to your cam sensor as well (5v or 12v)

Feb 1, 2016 | 06:15 AM

lmt0705

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So even though I have the conversion harness it still could be pinned wrong? What the hell is the point of buying it then?

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Feb 1, 2016 | 09:58 AM

lmt0705

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I have a 24x reluctor wheel, so do I need 12 volts or 5 volts? I have an ls2 based motor but it's in a car that used a12 volt system to those sensors. I'm confused. Lol

Feb 1, 2016 | 03:39 PM

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stevieturbo

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From: Norn Iron

The sensors will work with either 12v or 5v, but normally they receive a 12v feed.

Feb 1, 2016 | 07:02 PM

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lmt0705

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When should there be power present? Just key on our while cranking? I swapped wires and nothing different

Feb 1, 2016 | 07:13 PM

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stevieturbo

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From: Norn Iron

The crank/cam sensors must have power in order for the engine to be able to start and run.

So that obviously means during key on and cranking.

Feb 1, 2016 | 07:24 PM

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lmt0705

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It has power, I tried swapping wires, still nothing.

Feb 1, 2016 | 07:49 PM

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lmt0705

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Will the injectors fire if the coils don't?

Feb 1, 2016 | 08:00 PM

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lmt0705

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I'm going to try and count teeth in the reluctor wheel to verify it's 24

Feb 2, 2016 | 12:23 AM

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lmt0705

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Wound up being a rouge ground in the front of the car. Thanks for all the input!

Feb 2, 2016 | 10:42 AM

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2005vetteTT

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Quote:

Originally Posted by lmt0705

Wound up being a rouge ground in the front of the car. Thanks for all the input!

Congrats! Just to add - the cam sensor is not needed to start the engine. The ECU will not know when to fire so the ECU will inject fuel/fire every cycle instead of when it should. Once it gets started, it goes by the crank sensor and discards the cam sensor.

When I did a double roller setup my cam sensor was too close to the gear so it would not work. To get the car to start, I had to let it try a few times then cut fuel with the gas pedal and it would eventually start. I have now added a spacer and the car starts with no issue!

Not sure if this is the case for older cars but I have an 05 E40 ECU so that was the case for me.