9 votes
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How can vehicles run on E?

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, ...
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9 votes
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How does a cobra alarm system disable starting

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 ...
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7 votes

Why isn't injection managed to use the entire intake stroke?

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 ...
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  • 12.2k
7 votes

What does a good injector spray pattern look like for a four hole injector?

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 ...
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6 votes
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How to determine injector size for custom engine?

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 ...
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  • 38.9k
6 votes

Why isn't injection managed to use the entire intake stroke?

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 ...
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  • 38.9k
6 votes
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Why Ride by wire when the fuel injector is there

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) ...
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  • 1,722
6 votes

How to release fuel injectors from Volvo T5 engine?

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 ...
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  • 1,684
5 votes

Fault code 27 with engine light on '94 Jeep Cherokee

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 ...
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  • 10.7k
4 votes
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Are low-impedance fuel injectors just a placebo?

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 ...
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4 votes
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Do you need to replace injector seals if they are removed from the intake?

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 ...
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4 votes
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Calculating fuel flow rate through obd || sensor not supporting 015E and 0110 commands

I figured out that the formula stated in the paper for fuel flow below: fuelFlow = (MAF * 3600) / (14.7f * 820) ; // l/h is off by a single 0(needs an extra 0 added to the right of decimal).So we ...
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4 votes
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Rebuilding EV1 Injectors

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 ...
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3 votes
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Why do injector prices vary so vastly?

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.
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  • 12.1k
3 votes

How does a cobra alarm system disable starting

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 ...
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3 votes
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Is 12 volts safe for testing injectors?

Backprobe the injector signal wire and use that to activate the injector. Let the ECM or relay handle the power side of things.
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  • 10.7k
3 votes

Fuel injection modification for increased displacement

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 ...
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3 votes
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What fuel injectors I have to install?

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 ...
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  • 10.7k
3 votes

What fuel injectors I have to install?

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 ...
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  • 32.7k
3 votes

Fault code 27 with engine light on '94 Jeep Cherokee

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 ...
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  • 1,536
3 votes
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Do I have a fuel pressure or injector problem, or am I just chasing ghosts?

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 ...
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3 votes

Do injectors leak or injector seals leak?

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 ...
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3 votes
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Volvo 2.0D engine "self-oscillates" after changing timing belt and adjusting fuel-injectors

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, ...
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  • 7,798
3 votes
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Best practice for replacing fuel injector o-ring?

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....
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  • 2,085
3 votes

Calculating fuel flow rate through obd || sensor not supporting 015E and 0110 commands

I used above formulas to create below gnuplot helper functions vol_eff = 0.8322 f_time(x) = x/1000 f_rpm_to_rps(x) = x/60 f_mbar_to_kpa(x) = x / 1000 * 100 f_celcius_to_kelvin(x) = x + 273.15 f_imap(...
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  • 131
3 votes
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How do paired injectors work?

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 ...
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  • 34.4k
3 votes

Why doesn't polarity matter for fuel injectors?

Like normal magnets, electro magnets can only attract (pull) metallic objects, so the injector coil could not repel the solenoid valve.
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  • 20.1k
2 votes

Do I need to eliminate old gas before changing fuel injectors?

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 ...
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2 votes

Are low-impedance fuel injectors just a placebo?

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 ...
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2 votes

Difference between fuel injectors and emissions standards

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 ...
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  • 38.9k

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