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1

All of you are misinformed regarding Top Tier. Top Tier requires that every single location in a company's retail brand portfolio contains additives in sufficient quantities and of a certain chemical makeup to be considered TOP TIER. This is accomplished usually by an additive injection system at the terminal level that mixes in the requisite amount of ...


0

"Why can't people just upgrade fuel pumps and increase fuel line (pipe?) pressures to force fuel to flow in to the engine when the intake valves are open instead?" This is the job of the fuel injector/ECU. It is timed specifically so the proper amount of fuel is injected at the correct time. The ECU is tuned for a specific fuel pressure and can typically ...


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In multi port fuel injection the injectors are located near the Intake valve. In central port fuel injection there is a single injector with multiple valves that route to their respective cylinders. Think the 90's Chevy Blazer with the 4.3l Vortec. There is also throttle body fuel injection in which a single injector is located at the throttle plate. As ...


2

Here's the deal : higher octane means less volatility, and this is meant for engines with higher compression so that the fuel doesn't ignite too early in the cycle . Lower octane fuel is more volatile and is meant for engines where compression rates are lower, so that the ignition in the cycle not occur too early . In all cases, follow the manufacturer's ...


2

This situation could be Transmission Flare. The engine control briefly ups the RPM to match the transmission downshifting, to prevent an abrupt downshift feel. If the control or sensing systems are out of whack, it can overdo the RPM adjustment. Some of the items you replaced require adjustment or calibration. For example, the Idle Air Controller (a prime ...


1

Usually Vespa PX will give approximately 30-35KMPL, since you are getting 25KMPL I recommend you to check the air filter and the spark plug. This particular model is not available in our country, so I may be wrong somewhere. But I am giving you the basic tips which is suitable for all the automotive. Check the air filter if it is too much dusty or ...


2

The temperature engine rises because the ignition of the fuel is slower. It takes longer for the fuel to burn because there is less of it. The fuel itself has the same amount of BTUs available by burning it whether you use extra oxygen or not. PERIOD. When you blow on the coals in your fire, they get hotter but burn faster. They release the same amount of ...


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I think the answers are incorrect. Because the question assumption is incorrect. First we have to decide hotter compared to what? and also we need to know this is a fact, is it really hotter or is it a myth? in addition the amount of the fuel/oxygen ratio is important, is this condition always true for all lean ratios? Perhaps the correct question is why the ...


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You have a qualitative description of what happens, but let's break it down to a smaller scale. When we talk about "temperature" of something, we are really talking about how fast the molecules are moving around and bouncing off each other. "Temperature" is really "kinetic energy". And it turns out that there are other types of energy besides moving around ...


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If you have ever seen an oxy-acetylene torch being used, you will have noticed that before the oxygen is turned on, the torch has a bright yellow flame. This is the fuel burning in a less than ideal amount of oxygen. The flame is relatively cool and it produces a lot of soot. When the oxygen is turned on, tthe flame turns blue and becomes hot enough to ...


6

Funny you should ask this Max :) First lets make sure of our definition. Running an engine lean means changing the air / fuel ratio to have more air than is ideal (14.7:1 air to fuel). In my reading there are two effects. First, the fuel is an atomized liquid which has a cooling effect on the combustion chamber. So less fuel, less cooling effect. Second, ...


2

The stalling at high speed could be a variety and/or combination of things: clogged fuel filter, dying fuel pump, collapsing rubber fuel line. The need for a high fuel flow (engine demand) can cause old rubber fuel lines to collapse (Bernoulli effect). Fuel pump or fuel filter are self-explanatory. The Celica is fuel injected. If you uncap your gas tank ...


2

Simple answer - they are a hoax, and they don't work. The only way to power a car with water is to electrolyse the water into Hydrogen and Oxygen using an external power source (and it uses a lot of energy to do this), store the Hydrogen in the car and use that (with oxygen from the atmosphere) to power a Hydrogen fuel cell - the output from which is water ...


5

Your experiencing fouled plugs. Fouled plugs have carbon buildup that grounds the electrode of the spark plugs over the ceramic with carbon. The carbon buildup occurs because the AFR (Air Fuel Ration) is too rich. This makes the combustion process, when you fuel is burned, too cool. Since combustion is too cool carbon buildup occurs on your sparkplug and ...


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Thanks for all the time and input guys! Sorry, I only just realized I hadn't posted the solution. The pump he purchased (which did not directly interface with the electrical harness on the truck) came with a harness to splice into the trucks electrical lines (which it turns out we had done correctly), and another intermediary harness to be used between ...


6

It's a demand vs supply deal The fuel pumps found in most OEM fuel delivery setups today are driven by an electric motor that is running at a fixed speed. This effectively fixes the flow rate provided by the fuel pump. The majority of fuel-delivery systems found in fuel-injected vehicles are return-style. What this means is that the fuel injectors will ...


9

Background You asked Why is the effect of a bad fuel pump more noticeable at higher speeds? I assume that by 'higher speeds' you mean engine speeds or RPM's. During high RPM operation an ICE consumes more fuel so the flow rate into the fuel injection system or carburetor increases at higher RPM's. This taxes the fuel system and puts more load on the ...


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There are quite a lot of different fluids inside a modern car. I tried to group them by purpose. Hydraulic Fluids General use: Hydraulic fluids are used to transfer power from one point to another Brake Fluid - Based on glycole-ether, mineral oil or silicone oil. Brake fluids are designed to have high boiling points because the brake system is subject to ...


3

If you have changed major parts of the engine/transmission, you have almost certainly introduced air into the fuel lines or injection system. This will prevent fuel getting to the engine as the fuel injection becomes "airbound" - ie it can no longer pump the diesel through. Bleeding the fuel lines is as simple as starting from the tank and using the fuel ...


1

I'll try to dig out some E60, diesel-specific information if I have time, but consider the following as possible culprits: clogged fuel filter faulty fuel pump relay weak fuel pump


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When activated, ECON mode alters the Drive-by-Wire throttle system response curve in the range from about 10 percent to 60 percent of throttle pedal travel. With less gain, the throttle opening in this range increases more gradually to reduce a potentially excessive peak input for improved fuel efficiency. ECON mode also alters the operation of the cruise ...


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Depending on the car model and the technology used, not all fluids I mention here do exist. Here is list of all that I know of: fuel (some cars use two typed of fuel, e.g., petrol and gas, so they have two fuel tanks) engine oil two-stroke oil (in some systems the oil is separated and only combined in the injection) gear oil Automatic Transmission fluid ...



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