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24x, 58x Reluctor Mystery Engine

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Old Mar 14, 2016 | 09:15 AM
  #1  
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Default 24x, 58x Reluctor Mystery Engine

Okay so I know this topic gets covered often, but I think i have a unique situation.

Should note I bought what was described to me as a 2006 TBSS LS2 with harness from some guys garage. The harness was connected to the engine with everything plugged in. 2006 TBSS should be a 24x reluctor wheel engine.

Things that support 24x reluctor wheel engine
  • E40 ECM
  • Alternator is from a 2006 (2007 58x reluctor wheel engine has different alternator connector)

BUT, i have a grey crankshaft sensor.

So i know there's all these exceptions for when the engine was made and GM using old stock when it comes to the 24x vs 58x. But was there EVER a 24x engine with a gray crank sensor?

Otherwise it sounds like this guy bought the engine and bought a harness separately and an alternator separately and now I have the wrong harness.

Block code is 12598301

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Old Mar 14, 2016 | 11:44 AM
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Haha I'm a moron. I gave the back cover part # instead of the block code. I'll get the block code tonight after work.
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Old Mar 14, 2016 | 06:03 PM
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Well that certainly looks like a 58x wheel to me. Son of a bee-hive.

Does anyone know if there are any other accessories that differ between 24x and 58x? I would love to be able to just buy the ligenfelter box and be good to go.

Right now it looks like i have a 58x engine and 24x harness.
Is there anything else different between the a 58x and 24x other than the reluctor wheel and camshaft signal wheel? Are the alternators different or is that just for the TBSS? (2006 TBSS is a 24x and has alternator fitting A while a 2007 TBSS is a 58x engine and has alternator fitting B).

Video of reluctor wheel:
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Old Mar 15, 2016 | 08:11 AM
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Lets say I didn't want to go the ligenfelter box route, is there a specific E38 or E67 harness that I would need to get? Or would any of them do?

Essentially how interchangeable are they?
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Old Mar 15, 2016 | 08:46 AM
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Are you sure you have an E40 ECM and not an E67? They can look similar upon first glance.

E40:


E67:
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Old Mar 15, 2016 | 08:53 AM
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I'm trying to figure out what your end goal is here. Are you sure you have an E40 ECM and not an E67? They can look similar upon first glance.
That's fair, I wasn't clear.

I'm not changing the reluctor wheel and cam sensor wheel. I'm either going to change harness and ecm to match the engine or get the ligenfelter box. Right now it looks like i can change the harness and ecm for less money than the ligenfelter box; especially considering that my E40 harness has to be worth something.

But what I don't know is does it matter what E38/E67 harness I get? For example can I just buy a 2008 Silverado LY6 harness that has the E38? Will it communicate with my MAF and Throttle Body and O2 sensors and Gas Pedal?

I'm positive the computer I have now is an E40. It says E40 on it and the heatsink matches the E40 shape. It's clear now that the guy I bought the engine from didn't know the parts he was putting together weren't compatible.
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Old Mar 15, 2016 | 10:51 AM
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Have you checked the cam gear to verify it is a 4x cam gear?

What vehicle is this motor going into?
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Old Mar 15, 2016 | 10:51 AM
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Have you checked the cam gear to verify it is a 4x cam gear?

What vehicle is this motor going into?
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Old Mar 15, 2016 | 11:26 AM
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Originally Posted by MuhThugga
Have you checked the cam gear to verify it is a 4x cam gear?

What vehicle is this motor going into?
I'm really hoping they match.
Haven't checked yet. I'm looking into ways of doing it without taking the timing cover. I assume there's a hole in the timing cover underneath the cam sensor. I might try getting an inspection camera in there but I don't have high hopes. I guess I could do the same by removing the crank pulley.

Engine is going in Porsche 944.
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Old Mar 18, 2016 | 08:11 AM
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After fighting the damn cam position sensor i was able to read the part number on the timing wheel as 12591689 which is a 4x gear from a 2007-2009.

Looks like I'm good to go to order the ligenfelter box. After searching on rock auto, there are very few harnesses that would match my MAF, throttle body, and O2 sensors. Buying a new harness and being cheaper than the ligenfelter box would mean I would have to wait until i found one of those few harnesses.

Thanks for your help!
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Old Mar 18, 2016 | 08:58 AM
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Glad you got it figured out.
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Old Mar 19, 2016 | 07:56 AM
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make sure you keep the lingenfelter box in a well ventilated area away from engine heat. getting the box too hot (ie close to headers) will cause it to go into thermal protection mode and shut off the motor
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