Page 252 of GM Performance Parts 2006 Catalog by GM Parts Direct

ELECTRICAL IGNITION SYSTEMS 250 ELECTRONIC CONTROL MODULES COMPONENTS RPM LIMIT MODULE KITS 10039933 5000 RPM Module Kit Includes 5000, 5200, 5400, 5600, and 5800 rpm modules. 10039934 6000 RPM Module Kit Includes 6000, 6200, 6400, 6600, and 6800 rpm modules. 10039935 7000 RPM Module Kit Includes 7000, 7200, 7400, 7600, and 7800 rpm modules. 10039936 8000 RPM Module Kit Includes 8000, 8200, 8400, 8600, and 8800 rpm modules. These kits are supplied with five rpm modules for the Rev Limiter P/N 10037379 (see previous page). Choose from the following: NOTE: NOTE: NOTE: Chevy Small-Block V-8 (GEN 1 LS1-Style) 12480112 ECM, LS1 V-8 This ECM is calibrated for the LS1 Camaro/Firebird engine and can be used in a street rod or other early-model vehicles. This ECM is part of the engine kit. Use with Camaro/Firebird LS1 engine and wire harness P/N 12480113. 12480054 ECM, LS1/ASA Racing This LS1 ECM is similar to P/N 16238212 (see above), but is calibrated for ASA racing only. Use with wire harness P/N 12480055. 12480055 Wire Harness, LS1, ASA Racing Designed for ASA racing ECM P/N 12480054 only. 88962717 MEFI 4 ECM, Ram Jet 350 Replacement ECM for all Ram Jet 350 crate engines, MEFI 3 P/N 12495515 or MEFI 4 P/N 12499120. The MEFI 4 Ram Jet engine is a closed loop system that gives a much smoother idle and improved performance. Replacing the ECM on MEFI 3 Ram Jet engine P/N 12495515 requires using new wire harness kit P/N 12499116, or use jumper wire P/N 88963118 to use MEFI 4 ECM as an open loop system. 88961967 MEFI 4 ECM Wire Harness, Ram Jet 350 Designed to be used with the MEFI 4 Ram Jet 350 P/N 12499120 and MEFI 4 ECM P/N 88962717. 12499116 MEFI 4 ECM Wire Harness Kit, Ram Jet 350 This module/harness kit is used to convert a Ram Jet 350 from MEFI 3 to the newer MEFI 4 design, which provides a better idle through closedloop operation. It includes ECM module P/N 88962717, wire harness P/N 88961967, oxygen sensor P/N 25312200, intake air temp sensor P/N 25036751, oxygen sensor fitting P/N 15156588. The ECM is programmed with a "green mode" that controls the rpm for the break-in period. From start up to the end of first hour is 4000 rpm, second hour is 4500 rpm, and third hour is 5500 rpm. 15156588 Fitting, Oxygen Sensor This fitting is used on all MEFI 4 electronic controlled ignition systems. It should be welded into the exhaust pipe so the oxygen sensor can be screwed in to the exhaust system. 12489492 MEFI 3 ECM Wire Harness, Ram Jet 350 Designed for use with the MEFI 3 350 Ram Jet engine P/N 12495515 using ECM P/N 12489488. NOTE: NOTE: NOTE: Chevy Big-Block V-8 88962718 ECM, Ram Jet 502 Replacement ECM for all Ram Jet 502 engines (MEFI 3 P/N 12497323 or MEFI 4 P/N 12499121). The MEFI 4 Ram Jet engine is a closed loop system that gives a much smoother idle and improved performance. Replacing the ECM on MEFI 3 Ram Jet engine P/N 12497323 requires using new wire harness kit P/N 12499117 or use jumper wire P/N 88963118 to use MEFI 4 ECM as an open loop system. 12499117 MEFI 4 ECM Wire Harness Kit, Ram Jet 502 This module/harness kit is used to convert a Ram Jet 502 from MEFI 3 to the newer MEFI 4 design, which offers improved idle and performance through a closed loop system. It includes module P/N 88962718, wire harness P/N 88961968, oxygen sensor P/N 25312200, intake air temp sensor P/N 25036751 and oxygen sensor fitting P/N 15156588. The ECM is programmed with a green mode that controls the rpm for the break-in period. From start up to the end of first hour is 4000 rpm, second hour is 4500 rpm, third hour is 5500 rpm and fourth hour is 5800 rpm. 88963118 Jumper Harness, MEFI 3 to MEFI 4 This jumper harness allows an MEFI 4 module to be used with an MEFI 3 wiring system (to stay as an open loop system). 88958621 PROM, 502 Truck Conversions (1991-1993) This prom is used in the 502 emission-legal engine conversions for 1991- 1993 trucks. 88961821 ECM, Ram Jet ZL1 This ECM is calibrated for the Ram Jet ZL1 engine P/N 88961499 only. The MEFI 3 and MEFI 4 ECM Modules cannot be reprogrammed. 12489494 MEFI 3 ECM Harness, 502 Designed for the MEFI 3 ECM P/N 12489493 on the MEFI 3 Ram Jet 502 engine P/N 12497323. This wire harness is part of engine kit P/N 124973238. 88961968 MEFI 4 ECM Harness, Ram Jet 502 This ECM wire harness is used in the MEFI 4 Ram Jet 502 P/N 12499121 with the MEFI 4 closed loop oxygen sensor-equipped system. Use with MEFI 4ECM P/N 88962718. Ignition Electronic Control Module Systems Continued

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