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My vehicle has LPG as alternative fuel. It have OMVL REG injectors without temp sensors. OMVL REG injectors

It has already ~ 60000 km (In picture you can see, that one injector not used; 3 from left). Check engine light start coming on, and i cannot anymore adjust calibration for LPG and i bought new LPG injectors. After that i disassemble old one. In picture no 1, injector with number 3 was not used. Only moving part of injector are in my fingers in picture no 2. It one side is spring and another side is rubber. In picture no 4 it is just electromagnet.

So, in picture 1, all rubbers looks identical in its thickness (injector no 3 not used at all). What part can be run out in this setup ? Electromagnet? That part witch is in my fingers in picture no 2?

Pic no 1.
disassembled omvl injectors
Pic no 2. disassembled omvl injectors
Pic no 3. disassembled omvl injectors
Pic no 4. enter image description here

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  • Did the new injectors fix the issue ... no more check engine lights? Just curious.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Feb 4, 2014 at 14:37
  • Yes, it fixed issue. And then i think that old ones must repair, but there is nothing to repair (visually i cannot see anything)
    – Guntis
    Commented Feb 4, 2014 at 14:39
  • I sent an email to OMVL about your request. I'll post up whatever comes back (if I even do), unless someone else hasn't already answered the question. I would think the soft parts would be repairable (renewed), but the electromagnets are probably good or not. The work until they die, then need replaced.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Feb 4, 2014 at 15:22
  • @Paulster2, electromagnets - do they can work with half power? Or if they are working , then working and if not, then they are dead?
    – Guntis
    Commented Feb 4, 2014 at 18:32
  • I am making an assumption on that point, but yes. If it doesn't work, it doesn't work and there isn't much you can do to change that. Good side about it is, they should not go bad very often.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Feb 4, 2014 at 19:49

2 Answers 2

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The springs seem to lose their springiness. This means the valves (the bits in your fingers in picture 2) do not return to seal off the injectors quickly enough, so too much fuel enters the cylinder. The engine detects a mixture problem and tries to compensate, but (unsurprisingly) can't get it right.

The other part that wears out is the very small o-ring that sits between the spring and the outer cylinder. It normally stops the valve from banging into the outer cylinder when it is opened. As the rubber ages, the valves start to "clatter" as they hit the cylinder. I haven't had this problem, but I understand it can also cause mixture problems.

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Can you use a multimeter to measure the resistance of the solenoid coil in the injector? If so, then make a comparison with the new ones.

Seems to me that the injector would fail either by leaking or not opening. An open circuit in the solenoid's winding would cause the latter problem, and is probably difficult to repair (likely potted in epoxy).

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  • All electromagnets have 3.7 ohm resistance. (new and old)
    – Guntis
    Commented Feb 12, 2014 at 11:08

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