Hollywood Auto Body, Auto Repair Shop

Your one stop for full auto repair, Tune-ups, and auto Collisions Experts

full service auto shop in hollywood california
one stop auto shop in hollywood california about onestop auto shop hollywood one stop auto shop services hollywood auto shop faqs hollywood auto shop tune up specials hollywood auto shop photos contact onestop auto shop hollywood
Complete Auto Repair Services hollywod ca
OneStop Auto Repair

The difference between throttle body and mulit-point injection

 

The two basic types of electronic fuel injection (EFI) in use today are Throttle Body Injection (TBI) and Multi-Point Injection (MPI).

Throttle Body Injection


A TBI system is similar to a carburetor in that one or two injectors are located in a central throttle body that supplies fuel to the engine through the intake manifold. Instead of using engine vacuum to siphon fuel through metering circuits as a carburetor does, fuel is sprayed into the manifold through the injectors.

Multi-point Injection


In a MPI system, each cylinder has its own individual injector. The injectors are mounted at each of the intake ports so fuel can be sprayed directly into the ports. A single throttle body meters the amount of air entering the intake manifold so the amount of fuel delivered can be matched to the engine's needs.

Fuel Regulation


Fuel metering in both types of EFI systems is controlled by a combination of fuel pressure and injector timing. The longer injectors are on, the greater volume of fuel delivered to the engine.

Fuel delivery is also increased when there is a greater pressure differential between intake vacuum and fuel line pressure (which is controlled by a fuel pressure regulator).

Some of the other components in both types of EFI systems with which you should be familiar include:

1midle Air Control (IAC) Valve - used on EFI applications for idle speed control. The electric motor opens and closes a valve so air can bypass the throttle plates. Failure may cause stalling.

Throttle Position Sensor (TPS) - A rheostat-like device that mounts on the throttle shaft to inform the computer about throttle opening. Failure may cause hesitation. Sensor must be carefully adjusted when installed to give an accurate voltage reading.

Airflow Sensor - Used to measure how much air is entering the engine so the appropriate amount of fuel can be delivered through the injectors. Basic types include the "flap" style used on many import and domestic Bosch systems, and the "heated filament" and "hot wire" mass airflow sensors. Expensive to replace.

Cold Start Valve - An auxiliary fuel injector that provides extra fuel enrichment when a cold engine is first started. If defective, can cause hard starting. If leaks, can cause rich fuel mixture.

Warm-up Regulators - a device that controls fuel enrichment during engine warm-up on Bosch CIS fuel injection systems.

Fuel Pressure Regulator - A spring-loaded diaphragm that is used in EFI systems to control fuel pressure. Rebuild kits are available for certain applications.

Fuel Injector - Two types: mechanical and electronic. Mechanical injectors are used in Bosch CIS/K-Jetronic import applications, while electronic injectors are used on all domestic EFI applications. The electronic variety contain a solenoid that lifts a pintle valve open so fuel can spray out of the injector. The mechanical variety is spring loaded and calibrated to open when a certain minimum pressure is achieved. Both are susceptible to clogging from dirt and fuel residue. One new type of replacement injector has a disc valve design

 

OneStop Auto Shop

Call Today for all of your Auto Repairs

and Maintenance in Hollywood, Ca.!

(323) 227-9999

 

auto repair specials

 

ase certified auto mechanic

 

 

 

OneStop Auto Repair

7935 Santa Monica Blvd.

West Hollywood, CA. 90046

323-227-9999 

 

 

auto repair reviews hollywood

 

 One Stop Auto Shop Reviews

 

facebook onestop auto shopgoogle places onestop auto shop hollywood cayoutube onestop auto shop hollywood ca

 

 

all major credit cards accepted for auto repair

 

 
One Stop Auto is a full service auto repair shop
one stop auto shop in hollywood california about onestop auto shop hollywood one stop auto shop services hollywood auto shop faqs hollywood auto shop tune up specials hollywood auto shop photos contact onestop auto shop hollywood
dodge auto repair hollywood ca chevy auto repair hollywood ca lexus auto repair hollywood ca Saturn auto repair hollywood ca hyundai auto repair hollywood ca nissan auto repair hollywood ca porsche auto repair hollywood ca honda auto repair hollywood ca toyota auto repair hollywood ca toyota auto repair hollywood ca ford auto repair hollywood ca vw auto repair hollywood ca cadillac auto repair hollywood ca jeep auto repair hollywood ca kia auto repair hollywood ca

2012 onestopauto.com   |   Privacy Policy   |   Sitemap

 

Providing Auto Service for the following vehicles and more

 

Audi   BMW   Cadillac   Chevy   Chrysler    Dodge   Ford   Honda   Hyundai   Jeep   Kia   Land Rover

Lexus   Lincoln   Mazda   Mercedes   Mitsubishi    Nissan   Porsche   Saturn   Sion   Toyota   Volvo   VW

Hollywood Web Design