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Old 10-09-2019, 09:55 AM   #31
hatzie
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Location: Wentworth, NH
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Re: SMOG LEGAL ENGINE SWAP TO LS yesterday passed!

Quote:
Originally Posted by nekkidhillbilly View Post
the trans thing is crazy how the hell does that make a difference in emissions. fuel economy possibly if you kept say a th350 or 400 but emissions aren't going to change. I wonder how they deal with replacement engines on stock cars or say if this engine failed can you just swap in another 5.3? so many more things I wonder but im in ky so no point in me asking.
The PCM expects to get feedback from sensors in the automatic transmission.
If you have an LS with the ECM TCM setup the ECM expects to get feedback from the TCM.
If the ECM or PCM doesn't get feedback from the TCM or transmission in response to its' requests it gets lost. Some ECM/PCM will drop you into limp mode and others just plain freak out.

Harvey Hardway would brute force it with a tuning package. You run the risk of missing something minor that'll freak out the ECM/PCM in some obscure manner if you try to be Harvey Hardway.

The easiest way to handle running a manual transmission or an older automatic transmission on a modern engine is to program the PCM or ECM using a manual transmission vehicle VIN and then fine tune the settings with your tuning package.

The fuel and spark tables from a 3/4 or 1-ton truck may be advantageous as well.
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RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.

Last edited by hatzie; 10-09-2019 at 10:56 AM.
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