Information for your Chevy small block fuel injection system-
TPI swapping into an older vehicle. Click here to start
Also information for LT1 and the LSx-Gen III engines
When I started this website over ten years ago, the main emphasis at that time was on the TPI based engines (1985-1992). In that time since, the LT1/LT4 (1992-97) engines came and went and the LS1 based engines were still in their infancy. I have learned a lot in that ten years and hoped to be able to include information that would be of value to my reader. Although far from being complete, the basic information should be used as tools to further enhance the readers understanding of basic components and their function.
As good as the TPI and LT1 engines were, they were quickly eclipsed by the newer generation of small block known as the LS1, as the technology grew by leaps and bounds. This new class of engine, also known as the Gen III, superior in many ways, has now become the favorite for swaps and will continue to be so well into the foreseeable future.
I will continue to update this information as well as keeping the older TPI pages intact. Enjoy!
Cross-Fire, TPI, LT1 Information
Suggested reading (TPI Books and More)
TPI Troubleshooting Flowchart Link NOTE: These codes are basically the same for TBI, LT1 OBD I (1982-1995).
1986-1992 TPI ECM Pin-outs
Distributor Gear Applications-Important Reading
TPI Do It Yourself Information Page
1986-92 TPI Vacuum Line Diagrams
Chevrolet TBI General information
Chevrolet CPI 1992-2004-4.3, 5.0. 5.7L Vortec
Chevrolet LT1 general information
General Engine and Performance
Cross Fire Injection System
ECM Components and Component Functions- Basic information on ecm and sensor functions.
Ignition Systems- HEI and EST ignition-electronic spark control (ESC)
ECM Schematics:1985-95 TBI, TPI and LT1
1226870 (1985 F&Y BODY) 1227165 - 16198259 - 16198445 (1986-89 F&Y body V8 TPI)
1227727 - 16197128 - 16198260 (1990-91Y body V8 TPI) 1227730 - 16196344 - 16198262 (1990-92 F body V8 TPI)
1228746 (1989-92 F & B Cars, LO3 & LO5 TBI V8). 1227747 (1987-91 C/K Truck, Van, 4.3L, 5.7L, 5.0L & 7.4L)
16136965 (1991-93 Caprice, Roadmaster L03 & L05 TBI V8) 16159278 (1993 F body LT1, 1992-93 Y body LT1)
16181333 or 16188051 (1994-5 F, Y & B body LT1) 16214399 (1996) 16242921 (1997) (F, Y and B body LT1)
Prom BCC codes- TPI 1985 1986 1987 1988 1989 1990 1991 1992
Prom BCC codes-LT1 1992 1993 only. 1994-97 are non-removable flash proms
Basic Component information for the LS1/GEN III engines!
The Gen III engine family has become the fastest growing swap, in part to the simplicity of the design, and the unlimited performance potential these power plants offer. The information here mainly covers the early engines from 1997 through 2006. This is includes the LS1/LS6 5.7L, and the Vortec truck family of 4.8, 5.3, and 6.0L displacement. Does not cover LS2,LS3, LS7, LS9 or any other derivative of the later Gen IV or V engines.
1997-98 LS1 PCM pinouts 1997-98 LS1 PCM Schematics PCM Service # 16238212
1999-2002 LS1 PCM pinouts: F body (Corvette similar).
1999-2002 LS1 PCM schematics PCM Service #'s 9354896/12200411
1999 Vortec V8 (4.8/5.3L) PCM pinouts (2000-2003 w/o DBW similar)
1999-2003 Vortec V8 PCM schematics service # 9354896/12200411
1999-2003 Corvette PCM pinouts.
1999-2003 Corvette PCM Schematics
2004 Pontiac GTO LS1 PCM pinouts
2005-06 Vortec 5.3L PCM pinouts (4.8 & 6.0 similar).
2005-06 Vortec 5.3L PCM schematics (4.8 & 6.0 similar).
Cylinder head and engine component ID's
PCM identification by year (1997-2007)
Cruise Control Diagrams and Information ( non Drive by Wire).
Drive By Wire Systems
DTC code identification courtesy of
GEN IV Engines, Basic Component Information, Engine Controls.
GM upped the ante by introducing the Gen IV engine starting in 2005, with revised intake design, freer flowing cylinder heads and a host of internal improvements to the already popular design. The truck engines followed in 2007 with the same changes. All use an updated engine controller, with a separate transmission controller. All are drive by wire.
Engine Family Identification
PCM Identification by year 2006 +
2005 Corvette LS2 PCM schematics
2006 GTO LS2 PCM schematics
2007 Corvette LS2 PCM schematics
2007 Chevy Truck 5.3L PCM schematics (4.8 & 6.0L similar)
My 1978 Camaro Type LT
Project 2010- My Iron Block 425 HP LS6 engine
Need a custom LSx harness? Click here