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).
How to repair a GMC Vortec fuel injector?
1. Heat the hose like you did before. Heating only the very end will help you keep from kinking. 2. Slowly press the poppet back in, don’t rush it. 3. let it fully cool and give it a few good tugs to make sure it set.
Where is the fuel injector on a Chevy truck?
Fuel injectors are expensive, so using one injector instead of six seemed like a good idea at the time. 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.
How is fuel delivery controlled in a GMC Truck?
The powertrain control module (PCM) estimates air flow using inputs from the MAP sensor, throttle position sensor, temperature sensor and engine speed. Fuel delivery is controlled by pulse width modulation. The PCM varies the on-time or dwell of the MAXI injector to control the air/fuel mixture.
How does the fuel injector work on a Chevy truck?
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. When the pressure inside the lines reaches the opening pressure of the poppet valves (43 psi), fuel sprays out of the nozzles into the engine’s intake ports.
1. Heat the hose like you did before. Heating only the very end will help you keep from kinking. 2. Slowly press the poppet back in, don’t rush it. 3. let it fully cool and give it a few good tugs to make sure it set.
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.
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).
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. When the pressure inside the lines reaches the opening pressure of the poppet valves (43 psi), fuel sprays out of the nozzles into the engine’s intake ports.
Why is my Chevy Vortec 4300 V6 leaking fuel?
In the L35 and LF6 engines, the spider injectors are known to leak at the pressure regulator and at the supply and return lines due to a design fault. Outside of leaking fuel onto the exterior of the engine itself, it can cause excess fuel to get sucked into the engine.
What causes an engine to lose oil pressure as it warms up?
The most likely cause of a car losing oil pressure when it warms up is a problem with the pressure relief valve, which regulates the oil pressure to ensure that there is enough pressure to circulate oil throughout the engine. When oil pressure is low, not enough oil is being distributed to the engine, potentially causing engine failure.
Why do I need an oil change on my GMC?
An oil change, which drains old oil and replaces with fresh new oil, helps to keep an engine properly lubricated. Years ago, engine oil changes were typically prescribed at a set interval, which was usually based upon mileage.
In the L35 and LF6 engines, the spider injectors are known to leak at the pressure regulator and at the supply and return lines due to a design fault. Outside of leaking fuel onto the exterior of the engine itself, it can cause excess fuel to get sucked into the engine.
How does a GMC Sierra 1500 fuel pump work?
The older model has steel lines coming off of the top of the pump to the frame rail and then connects to the frame steel lines with short hoses, you’ll need line wrenches and the ability to curse. The newer style has plastic tubes from the plastic pump casing and uses those quick connect fuel fittings and you’ll need the disconnect tool.
Are there any problems with the Chevy 4.3 Vortec engine?
The 4.3 Vortec engines made from 1996-2002 (L35 and LF6) have been reported to have engine knock problems. In a properly functioning engine, fuel burns in even pockets instead of all at once. The pockets burn in even timing, in sync with engine cycles. Engine knock occurs when the fuel burns unevenly and out of sync with the engine cycles.
What kind of gas do you use in a GM Truck?
(Image courtesy of General Motors) GM recommends using 93 octane gasoline for its top-of-the-line 6.2-liter V-8-equipped trucks. The owner’s manual does state as low as 87 octane is acceptable for the engine. However, to achieve maximum performance and fuel economy you must use 93.
Can a GMC Sierra run without a fuel pump?
Without gas your Sierra will not run at all. With that in mind, most of the symptoms of a bad fuel pump revolve around the vehicle stalling out or not running at all. In modern fuel injected vehicles, the fuel pump sits right in the fuel tank and “pushes” the gasoline to the fuel rail (s).
(Image courtesy of General Motors) GM recommends using 93 octane gasoline for its top-of-the-line 6.2-liter V-8-equipped trucks. The owner’s manual does state as low as 87 octane is acceptable for the engine. However, to achieve maximum performance and fuel economy you must use 93.
What kind of engine does a GM Truck have?
GM 6.0 Liter V8 Vortec L96 Engine The 6.0L V8 Vortec L96 is an engine produced by General Motors for use in its full-size heavy duty (HD) pickup trucks, vans, and SUVs.
The powertrain control module (PCM) estimates air flow using inputs from the MAP sensor, throttle position sensor, temperature sensor and engine speed. Fuel delivery is controlled by pulse width modulation. The PCM varies the on-time or dwell of the MAXI injector to control the air/fuel mixture.
Is there no fuel from injectors to start truck?
No fuel from injectors to start truck. When I try and start my 93 Chevy Cheyenne k3500 no fuel come out of the injectors. If I use starting fluid the truck starts and the injectors work great. Has died a couple times while driving, but mostly runs fine and then won’t start one turned off.
Where is the heater on a GM fuel injection system?
The universals just splice onto the wire from the harness. For headers It is recommend a 3 wire heated sensor mounted in collector behind the header, not in the header. They have a built in heater to keep the sensor hot when it is mounted down in the collector.
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.
Where is the fuel pump on a GM Truck?
As you’re already aware, the throttle body fuel injection system on your 1987 to 1995 4.3L, 5.0L, or 5.7L pickup (or SUV) uses a low pressure (12 PSI) electric fuel pump located in the gas tank. And although GM did not include a Schrader valve to which you could connect a fuel pressure gauge, it can be tested with one to find out if the fuel
When did the GM TBI fuel injection system start?
Same can be accomplished with any TBI system from mid 1980s to 1995 and all information here will lead you to the right choice! Best thing to do is go to junkyard and find a motor similar size as yours and get the complete system and parts.
Can a bad fuel pump start a GM Spider?
If you need to test the ‘spider’ equipped GM pickups or SUVs, the following tutorial will help: Troubleshooting The Fuel Pump (GM 4.3L, 5.0L, 5.7L). A bad fuel pump will make your 4.3L, 5.0L, or 5.7L throttle body fuel injected pickup or SUV crank but not start. Here are some more specific symptoms:
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.
What kind of fuel injector does a 4.3L engine use?
This system used on all 4.3L, 5.0L, and 5.7L engines from 1996 to present. This ‘Spider’ assembly has either 6 or 8 individual fuel injectors that feed 6 or 8 nylon fuel lines. The CSFI system does use a MAF sensor.
What causes a fuel injector to go bad?
Right off the bat, I’ll tell you that the most common cause of this happening is usually the PCM (Powertrain Control Module = Fuel Injection Computer) going bad. What Vehicles Can I Apply This Info To?
What causes a spider fuel injector to misfire?
This case study will help you to diagnose a ‘Spider’ fuel injector that is stuck open due to the PCM having fried and causing one of two things: A misfire condition or an engine hydrolock condition (a no crank condition caused by gasoline filling up an entire engine cylinder).
What does CSFI stand for in fuel injection?
CSFI ‘Spider’ fuel system: CSFI stands for: Central Sequential Fuel Injection. This system used on all 4.3L, 5.0L, and 5.7L engines from 1996 to present. This ‘Spider’ assembly has either 6 or 8 individual fuel injectors that feed 6 or 8 nylon fuel lines.