9
votes
Accepted
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 ...
- 23.5k
9
votes
Accepted
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, ...
- 153k
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 ...
- 12.4k
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 ...
- 153k
6
votes
Accepted
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)
...
- 1,722
6
votes
Accepted
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 ...
- 39.1k
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 ...
- 39.1k
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 ...
- 1,768
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 ...
- 10.7k
4
votes
Accepted
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 ...
- 153k
4
votes
Accepted
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 ...
- 181
4
votes
Accepted
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 ...
- 643
3
votes
Accepted
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.
- 12.2k
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 ...
- 630
3
votes
Accepted
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.
- 10.7k
3
votes
Accepted
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 ...
- 153k
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 ...
- 611
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 ...
- 1,587
3
votes
Accepted
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 ...
- 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 ...
- 33k
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 ...
- 23.5k
3
votes
Accepted
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, ...
- 8,448
3
votes
Accepted
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....
- 2,115
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(...
- 131
3
votes
Accepted
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 ...
- 34.6k
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.
- 24.9k
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 ...
- 39.1k
2
votes
What sort of maintenance do GDI injectors need?
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/...
- 1,722
2
votes
Accepted
Can Getting Fuel Injectors or Ignition Coils Wet Ruin Them?
If you are sure about your spark plugs, it surely is a coil pack. 100%.
If your spark plug does not give a spark, but the coil is good, and you don't replace the plug, it will ruin the coil. And even ...
- 1,448
2
votes
How can vehicles run on E?
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 ...
- 23.5k
Only top scored, non community-wiki answers of a minimum length are eligible