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Posted on Jan 02, 2017
SOURCE: throttle body in 2001 Passat
throttle body is located at intake manifold ..follow snorkle from air cleaner to where it attaches to motor ..looses hose and clean with carb cleaner there..open blades(throttle) to get behind entry good also..... fuel filter is located in tank and in line from fuel tank just in front of tank inline with fuel line...good luck
Posted on Dec 16, 2008
This is usually an indication of "blowback" caused by worn piston rings. How many miles on the engine? There is not a cheap solution if it is blowback.
Posted on Apr 28, 2009
SOURCE: i have a saab 93
the higher the speed the more veloctity will
be pulled OUT of that cowl opening...... those rear opening cowl hoods are ment
to **** air ( THE HOT AIR ) out ! not in .
Acording to the procedure.The hood is fed by the positive pressure created at the base of the windshield. The 'hood' system starts to become effective around 35+ MPH by providing good clean but more importantly, cooler air. Cowl induction systems work well if put together properly. Usually there is a air box that fits under and around the air filter assembly and seals to the hood when closed. That isolates the air filter from the hot engine air and allowing the carb or TBI to pull air while the cowl opening pushes cold air . Thats the idea.
TBI Throttle Body Injection is a very versatile, highly adaptable form of electronic controlled mechanical fuel injection. TBI provides the optimum mixture ratio of air and fuel at all stages of combustion. TBI has immediate response characteristics to constantly changing conditions and allows the engine to run with the leanest possible air / fuel mixture ratio, greatly reducing exhaust gas emissions. Because it's air / fuel mixture is so precise, based upon much more than simple engine vacuum and other mechanical metering means, TBI naturally enjoys an increase in fuel economy over a simple mechanical form of fuel introduction such as a outdated carburetor.
The TBI form of EFI is controlled by the ECM (Electronic Command Module) which controls the TBI based EFI system through all stages of operation according to data received regarding the current state of engine performance, speed, and load. The main component of this system is the TBI throttle body injector, which is mounted on top of the intake manifold, much like a carburetor. The throttle body injector is composed of two different parts; the throttle body itself, and the injector assembly. Hard to understand, isn't it? The throttle body is in fact, a large throttle valve, with a pair of linked butterfly hinged flapper valves, which are controlled by a simple mechanical linkage to the accelerator pedal. Depressing the accelerator pedal will force the throttle valve to butterfly open further and further, increasing the flow of air through the throttle valve and instructing the ECM to add more fuel, thus producing more power, faster speed, and acceleration.
Attached to the body of the TBI unit are two sensors; the TPS throttle position sensor, and the IAC idle air control assembly. The ECM uses the TPS to determine the accurate position of the throttle body valve, it's degree of cycling, and how open it is (0% to 100%). The ECM takes readings from the IAC in order to maintain a constant idle speed during normal engine operation, during all stages of power, load, and combustion.
The fuel metering assembly contains a fuel pressure regulator which dampens the pulsations and turbulence generated from the very high pressure fuel pump. Think of the FPR as a conditioner that smoothes out the flow of fuel from the outside to the inside of the fuel metering assembly. The FPR also maintains a constant, steady pressure at the injector assembly. Dual fuel injectors are mounted over the throttle valve, synchronized, and raised slightly over a venturi (narrowing radius) throat. Each injector is controlled by the ECM through an electrically initiated solenoid (switch). The precise amount of fuel delivered by each injector is varied by the amount of time that the solenoid holds the injector plunger open for operation.
A high pressure, high volume electric fuel pump is used with the TBI system. This pump is located within the fuel tank itself (which can be a PITA if you have to replace it). Once the ignition key is inserted into the ignition, and the ignition moved to the RUN or START position, the fuel pump relay instantly initiates the pump, beginning the transfer of fuel (via the pump) from the tank to the injectors. A safety relay in the system shuts the pump off after two seconds, to keep the fuel from flooding. Failure of the fuel pump relay will allow the fuel pump to operate only after four pounds of oil pressure have built up. A high capacity fuel filter, similar to an in-line variety, is located on the left side of the vehicle, at the rear of the engine.
Two common mistakes when working with the EFI system. The fuel system is pressurized. If you remove a fuel line, you could/will get a face full of fuel! The fuel pump used on the EFI system is much more powerful than that found on a carburetor installation. For this very reason, the second problem is that you cannot use a EFI fuel pump to feed a carburetor, and you cannot use a normal carburetor mechanical style fuel pump (low pressure) to feed a EFI system. In order to work on any part of the EFI system, you must first depressurize your fuel system!!!!!
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Posted on Mar 03, 2010
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