9

The gas gauge is just an indicator and each vehicle is going to be different. I know the older Datsun Z cars had two gas gauges, one was the main one which showed the volume of gas down to 1/4 tank, while the secondary one showed from 1/4 down to empty. The secondary gas gauge was very accurate to give the driver a true indication of how much fuel was in the ...


9

I'm afraid I have some bad news for you. Assuming that your alarm is a Thatcham approved alarm and was installed by an approved installer, it must disable the vehicle at a minimum of three different points. Additionally the Thatcham specification stipulates the entire alarm loom must be black. Even if it's a lesser, non-Thatcham alarm, the biggest issue ...


7

Keep in mind that at high loads/WOT, the injector may be open nearly constantly - during all four strokes. (Injector Duty Cycle >90%) In fact, many systems switch from sequential port to bank and then continuous fire (all injectors firing at the same time) when high fuel demands are called for. The difficultly is balancing WOT needs with idle with only ...


7

Basically, the spray pattern should be conical and even, without streaming, dripping, or uneven spray occurring. This ensures the fuel is atomizing as much as possible. Here is a granular image which shows what a multi-port injector (like yours) should look like: You should be looking at 3rd from the left. From your image on the other question, I'm not ...


6

Assuming this is for a naturally-aspirated application, your calculations are reasonable. I think you just missed dividing the value obtained by the number of cylinders. Usually 2.5 L engines have 4 cylinders and (subsequently) 4 injectors. So 1328 cc/min / 4 = 332 cc/min You would select the next biggest injector size available (although 330 cc/min ...


6

Consequently, you get a superrich part of mixture together with just air in the cylinder. These still have to mix/homogenize in the cylinder to get a good combustion. This is already handled by both flavors of pulsed fuel injection: In port injection Fuel and air are mixed before they enter the intake valve, so the incoming charge is already fairly ...


6

The difference between FI and Ride by Wire Fuel injection means that the flow of fuel to the engine is controlled by the ECU, as opposed to a carburetor. (of course, there's more to it than that) Ride by wire means the butterfly is opened by an electronic motor, as opposed to a cable. Fuel injector does a lot than just injecting the fuel into the engine ...


5

You need either a digital storage oscilloscope or a noid light to test signal from the PCM to the injectors. If you don't have a DSO you will also need a multi-meter. You want to disconnect an injector, check the connector for fit and check the pins for corrosion etc... Injectors have 2 wires. Shared power and PCM ground. Power will always be the same ...


5

The trick is not to pull on the spring clip but rather to depress it by pushing it into the fuel injector in order to clear the locking tabs which then permit the fuel injector to be pulled out of the intake manifold. The gif below demonstrates the push mechanism, which is effectively done with a flat head screwdriver. Focusing in on the clip itself you ...


4

For the most part, I believe people put low impedance injectors in their vehicles because that's what everyone else does. They are just "keeping up with the Jones'" in the pseudo-high performance world. Most applications will not require them. There are two reasons which might require a low impedance injector: If the engine has to rev very high (as you ...


4

tl dr: Replace the old o-rings I would suggest you don't have to replace them, but I would replace them anyway. If they are the original ones, they are probably around 9 years old. At this point, the rubber is probably very hard. Secondly, you've probably already nicked a couple of them, which means they'll leak unmetered air into the intake system. This ...


4

I had a similar worry when I replaced the pintle caps on a set of my own injectors. In my case I actually hadn't installed them far enough on to the injectors themselves and they were causing a weird idle issue. Anyways, long story short the mechanic that ended up figuring this out told me that when you go to replace the pieces it can be very very hard to do ...


3

AliExpress often has inventory from a warehouse that shutdown, and they're just trying to get rid of stuff. Also look at quantities, AliExpress often has minimum order volumes.


3

Having a Cobra alarm fitted to my 1985 Supra, I can confirm what Steve Matthews wrote. The alarm inhibits the ECU (thereby coil and injectors), fuel pump and starter motor. Fundamentally, this is done by intercepting wires going to relays, but a well-fitted alarm will do so in such a way you'd have to dismantle most of the dashboard to find the right wires. ...


3

Backprobe the injector signal wire and use that to activate the injector. Let the ECM or relay handle the power side of things.


3

A few assumptions first: It is an open loop alpha-n type of injection system (just has a TPS, no MAF or MAP sensors, no O2 sensor, no catalyst) If the above is true, you could probably make it run using that method, but there will be a trade-off, the difference in fuel requirements at one condition (say idle) between the 250 and 350, will be different to ...


3

It looks like the California emissions injectors flow more fuel and have a higher resistance. The design also looks different this could lead to fuel leaks. If you had a Federal emissions car it could also throw off the engine computer either resulting in running too rich or the car setting a circuit code.


3

Your car is either a California car or it is not. You can call the dealer and give them your VIN number and in order to have your vehicle identified. Once you know what your car is then you can purchase the proper fuel injector that is required for your vehicle rather than hoping that the cheap injector will work.


3

This could be any number of things, a bad injector, broken wire, or a loose or corroded connector. I'd start by checking the connections to all the injectors. Make sure there's no crud in the connector and that it's making good contact. You didn't mention whether there are any other symptoms beyond the error code.


3

Realistically I'd redo your test using a little more accurate of a timing sequence. Two things to really make it more accurate: Use some sort of stopwatch (apps for cell phones are free). Doing so will ensure you are getting the time you are looking towards. Right now you are guessing you are using the exact same time. Human nature tells me we cannot get ...


3

I fear you may have jumped several steps at once here. It is likely that a failed or faulty coolant temperature sensor is causing your hot-start issue. As regards the fuel system, this will retain pressure for some time after the vehicle is stopped but the pressure in the fuel lines typically remains fairly constant as it's set by the fuel pump and ...


3

Please state the exact engine code, it would be also nice to know the exact work that he did there. Just some informations on injector maintenance: Injector maintenance is a very complicated thing, also adjustment on common rail injectors (I suppose that's the case with your engine) IMHO is extremely complicated perhaps even not possible for certain types. ...


3

Fuel bleeding varies, or rather pressure relief of the lines, but some engines have Schroeder valves which could be bled. WRT, O-ring lubrication, there would be no harm in using a drop of engine oil. Last I looked at US gasoline specs, they could be about 4% oil anyway. In summary, a little oil would not cause any problems with all the gasoline injection ...


3

Yes, paired injectors is one solution, but have you looked for standalone ecu's with more outputs? It does affect the fuel use obviously, as only one cylinder is firing while the other is closing exhaust and opening inlet. As for ignition, the same concept applies - double ended coils will work as a spark into a cylinder changing from exhaust to inlet is ...


2

If the tank was full up (or nearly full) there isn't a lot of space for the fuel to absorb moisture. If you can draw some fuel out to see how it looks, I'd go with that. If the gasoline is a rich amber color, consider getting it drained. If it's still fairly clear (towards looking like water), then it is probably fine.


2

I don't see much benefit in them either. When you install any after-market injectors, you update the ECU maps to accommodate the latency of the new injectors and never worry about it again. As long as they open and close fast enough so that you can get enough fuel into the cylinder prior to each combustion stroke, it doesn't matter what their latency is.


2

The most reliable way to tell if two injectors are interchangeable is to determine how much fuel they can flow in a given amount of time. The close the two flow rates are, the more compatible they will be. In an ideal world you could bench-test them with a setup similar to Jafro's. The difference in fuel trims before and after injector replacement is ...


2

Don't forget that under stoichiometric conditions (which all engine manufacturers strive to run at), the air:fuel ratio is quite high (14:1). Injectors are commonly sized with this in mind. Very little fuel is actually required to make a big enough bang to drive the piston. An interesting aspect is that older fuel injection systems actually would use most of ...


2

A vehicle needs to have fuel to run, however once the tank is empty (or indicating empty) there is likely fuel left in the fuel lines, in the filters, in the swirl pot, in the float chambers and in the fuel pump. If a car is already moving, especially if it's not accelerating or if it's going down a gentle decline, it uses surprisingly little fuel. That ...


2

So, the IS350 actually utilizes both port and direct injection. This results in the IS350 having fewer carbon build-up problems than the IS250, which exclusively uses direct injection. The dealer/shop procedure for this maintenance is, at best, to inspect the valves for build up. If you want to maintenance the vehicle as recommended by Lexus, take it to the ...


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