What is central point injection?

Back in 1992, General Motors introduced a new type of fuel injection system known as “Central Port Injection” (CPI), which GM also refers to as “Central Multi-point Fuel Injection” (CMFI). Fuel injectors are expensive, so using one injector instead of six seemed like a good idea at the time.

How do you adjust the timing on a fuel injector?

If you decide to alter the fuel injection pump, you’ll need to:

Use a socket wrench on the front camshaft bolt to hand-turn the engine clockwise until the first cylinder is at TDC.
Both the intake and exhaust valves should be closed, and the TDC mark should be aligned.

When did Vortec start using CSFI fuel injection?

The system was used on 4.3L V6 Vortec engines through 1995, and was redesigned in 1996 and renamed “Central Sequential Fuel Injection” (CSFI). The system was also added to 5.0L and 5.7L Vortec V8 engines.

How many fuel injectors are in a Chevy truck?

If one comes loose, it can spray fuel where fuel doesn’t belong and create a potential fire hazard. On the second generation Central Sequential Fuel Injection (CSFI) system (1996 and up), the MAXI injector in the central housing has been replaced with six individual injectors, each of which feeds fuel to its own poppet spray nozzle.

Where is the Maxi injector on a Chevy truck?

The MAXI injector is mounted in the center of the intake manifold on the 4.3L engine, and is hidden inside the split plenum manifold. Instead of spraying fuel directly into the manifold like a throttle-body injector, the MAXI injector routes fuel into six nylon fuel lines that have poppet-style spray nozzles on the end.

What kind of fuel injection does a GMC use?

Back in 1992, General Motors introduced a new type of fuel injection system known as “Central Port Injection” (CPI), which GM also refers to as “Central Multi-point Fuel Injection” (CMFI). The system was used on 4.3L V6 Vortec engines through 1995, and was redesigned in 1996 and renamed “Central Sequential Fuel Injection” (CSFI).