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It is recommended to prefill the oil filter during an oil change to reduce the amount of time needed for the oil pump to fill a new oil filter. In cars with vertical oil filters it is easy to fill the new filter before installing it on the car but this solution is not effective for other cars.

In cars with non-vertical oil filters, one solution is to fill the engine with fresh oil and then to disconnect the coil pack connector and start the engine for a few seconds with only the starter turning the engine slowly to fill the new oil filer. After that you can reconnect the coil connector and start the engine normally.

This is the method I use after each oil change but there is a problem. Whenever I disconnect the coil pack, turn the engine by starter and reconnect it the engine fires up rather violently. In a normal cold start-up, my car revs up to around 1600 RPM then goes back to 1000 - 1100 RPM but when I disconnect and reconnect the coil pack, it suddenly jumps to 2000 RPM violently and then everything goes back to normal. I think this aggressive behavior is not good for a stone cold engine to fire up like that. How can I solve the issue and start the engine normally after my oil change? I think the reason of this aggressive behavior is the presence of unburned fuel inside combustion chambers during the time I start the engine with the coil disconnected. I tried to disconnect all 4 fuel injectors too but that didn't solve the problem.

LFY MP7.3
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2 Answers2

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I believe your guess is correct as far as the fuel in the cylinders that hasn't been fired. I believe another contributing factor is the cylinders have generated heat from the compression and are warmer than they would be if the engine hadn't been cranked.

You don't say how long you wait between the cranking with the disconnected coil pack and the startup, but I'd suggest waiting 10 minutes to let the cylinders get back to ambient temperature.

As another solution for not being able to prefill the oil filter, an oil filter will absorb about the first full quick fill if you rotate it. I've done this on my engines that had upside-down oil filters. As quickly as I could fill it up without filling, then stop, rotate it around until I get it completely sideways and let the oil filter soak up the oil in there. So far it's worked with everything from the tiny oil filters to the larger ones.

Mr. Anderson
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I don't agree with your method because the wear is miniscule when installing a dry horizontal filter. But, if you want to do this you may want to first remove the fuel pump fuse then relieve the fuel pressure preferably with a fuel pressure gage before you start the oil change. Then disconnect the primary connector to the coil pack. Now you have no fuel and no spark. After oil change crank the engine to fill the filter. Then plug in the coil replace pump fuse. Turn the key to the run position and let it stay there for about 4 seconds to pressurize the fuel rail. Then start the engine.

Jupiter
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