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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, ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
Steve Matthews's user avatar
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 ...
SteveRacer's user avatar
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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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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) ...
justinm410's user avatar
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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 ...
Zaid's user avatar
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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 ...
Zaid's user avatar
  • 39.2k
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 ...
jxramos's user avatar
  • 1,860
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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 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, ...
Martin's user avatar
  • 8,458
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 ...
With A SpiRIT's user avatar
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 ...
Techlord's user avatar
  • 643
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 ...
Steve Matthews's user avatar
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.
Ben's user avatar
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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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
Gargravarr's user avatar
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.
tlhIngan's user avatar
  • 12.2k
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 ...
KnowledgeQuest's user avatar
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....
mongo's user avatar
  • 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(...
Jaakko's user avatar
  • 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 ...
Solar Mike's user avatar
  • 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.
HandyHowie's user avatar
  • 25.4k
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/...
justinm410's user avatar
  • 1,742
2 votes
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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 ...
Arturs Bolsunovskis's user avatar
2 votes

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

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 ...
Gargravarr's user avatar
2 votes

How to determine injector size for custom engine?

Looks good except the Number of Cylinders (or more specifically, injectors) part. In the case of a EJ257 Subaru motor (ironically 2.5 liters, 4 cylinders) a set of Deatschwerks 750cc units will get ...
SteveRacer's user avatar
  • 12.4k
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 ...
Steve Matthews's user avatar
2 votes
Accepted

How Long to Power the Injectors for a Fuel Pump Volume Test?

According to agcoauto.com the length of time that you are supposed to let the fuel flow is 15 seconds. In that period of time, you should have collected at least 1 pint of fuel. However, you should ...
procrastilater's user avatar
2 votes

Why is my car hard to start only after a few hours?

Pull all your spark plugs, careful not to mix them up in reference to which cylinder they were IN. Are ALL of them as BAD as That one you show us here? IF that plug is the darkest, IS IT FROM THE ...
user25025's user avatar
2 votes
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Do I have a fuel pressure or injector problem Part 2

Sounds like your pressure fuel pump is 100%. Pressure regulator could be off. If your above 30psi after 5 mins you are probably OK. The pressure regulator works by bleeding pressure back to the tank....
Dirk Broer's user avatar

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