A higher resistance coil will draw less current, all else being equal, and usually that's in the direction of not having a problem. Some types of coils rely on a spike of in-rush current to get them to shift. If your current supply is not providing that, this might be a problem. Other times the coil may be supplied with a reduced voltage or a duty-cycled signal. If the new coil is not designed for that (requires full voltage supply, or isn't designed for fast cycling of a duty-cycled signal), that's going to be an issue.A lot of automotive control solenoids are operated by a Duty Cycle, even if they are an on/off operation. This is so the controller can tell if the armature is responding to the signal. It uses the Inductive feedback, that varies with the armature position, to tell if the armature is moving to the position commanded or if it is stuck in one position. It is possible the new solenoid valve is not strong enough to open against the oil pressure. Is the internal valve geometry the same? If it is a valve designed for a different application it may not be able to open. Generally, lower impedance solenoids are stronger because they are drawing more current but that is a gross over simplification as there are many other variables including stroke & valve design.

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