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Old 10-08-2019, 08:00 AM   #29

hatzie's Avatar
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 3,944
Re: SMOG LEGAL ENGINE SWAP TO LS yesterday passed!

Originally Posted by kipps View Post
Presumably you're correct.

The original poster mentioned that the ECM coding had to be 100% stock in order to pass. Manual conversions require software tuning, otherwise they set the "check engine" light(another no-no) at a minimum.
Look up a VIN in the donor engines' model year with a manual transmission. They were available on the GMT800 chassis trucks.
Then re-code the PCM with a J2534 passthrough ( I use a WiFi MDI clone ). You use that VIN with a single VIN license in the web applet at the AC Delco TDS web page. Program as a replacement PCM and it'll dutifully program your PCM with manual transmission parameters etc for that VIN.
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8

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.
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