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Which TB for LS3 crate engine

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Old Feb 3, 2011 | 04:38 PM
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Default Which TB for LS3 crate engine
I have a LS376/480 and have fitted the later type TB with the brass plate. I'm having idle problems with it and have read it should have the older LS2/3 TB part number 12570790. Is this likely to fix my problem? I'm considering buying HP Tuners to have a go at setting up the idle, and tune generally. I have the GM ECU/harness kit for that engine. Do I buy HP Tuners, the earlier TB, or both? Help would be appreciated guys. THe installation is great and nearly done, but I'm fed up with how its running.
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Old Feb 3, 2011 | 06:28 PM
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What year is the PCM and from what vehicle? If you have an earlier than 08 PCM, I don't believe or at least haven't seen anyone successfully tweak the tune to make that TB work.
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Old Feb 3, 2011 | 10:16 PM
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It's a 06 Cts-v controller according to the literature I have. The TB responds to demand but it stalls on return to idle, and I have a DTC.
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Old Feb 5, 2011 | 12:15 AM
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depends on what you are putting it into... i hear ls3 tb wont work with ls2 stuff with out an harness
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Old Feb 5, 2011 | 05:31 PM
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I got hold of a 12570790 throttle body today and fitted it. Its cured one problem - the MIL is now so I guess the later TB was incompatible with the ECU. The engine seems to run better but the idle problem is still there - dying on return to idle. Seems like its time for HP Tuners next...
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Old Feb 6, 2011 | 09:16 AM
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why did you ditch the TB that cam on the crateengine?
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Old Feb 6, 2011 | 09:22 AM
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Originally Posted by Deano1712
It's a 06 Cts-v controller according to the literature I have. The TB responds to demand but it stalls on return to idle, and I have a DTC.
I think you need the older TB with the silver plate.
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Old Feb 6, 2011 | 03:33 PM
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Originally Posted by Jimbo1367
why did you ditch the TB that cam on the crateengine?
The engine didn't come with a TB. Its a LS3 crate engine originating from Australia. I bought the later type TB which was throwing up a DTC. I have the earlier type now with the silver plate and the DTC is gone but the bad idle remains. I have read lots of stories on here and HP Tuners forum of the LS376/480 engine not idling right with the stock GM tune.
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Old Feb 7, 2011 | 02:25 PM
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You'll probably just need to update the tune in that PCM. What tuning software are you running? Depending on if that 06 CTS-V ran a 90mm TB, you may need to change the ETC Throttle Area Conversion. Also, adjusting Air Flow will help it idle, it did mine
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Old Feb 8, 2011 | 10:41 AM
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Originally Posted by AVB
You'll probably just need to update the tune in that PCM. What tuning software are you running?
I have just ordered a copy of HP tuners Pro. Hopefully i can get a copy of a good tune for the engine, or mess around with the settings.
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