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Old 11-21-2015, 04:43 PM   #1
tomm9050
 
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Engine Dust Cover

I just changed spark plugs (07 HB) and before I reinstall it, are there any pros or cons of not using the engine dust cover?
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Old 11-21-2015, 05:12 PM   #2
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There have been reports of water getting into the coil holes causing misfires. That being said most of those cases happened with the cover still on.

No real issues except dirt getting on valve cover as opposed to the dust cover.

I remove mine during the summer and install it again in the winter

This is more for aesthetics as I have my valve cover and coils painted. But that's about it
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Old 11-21-2015, 10:58 PM   #3
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I removed mine to let as much heat out. Any heat that stays under there is just making your ignition coils etc hotter, which will shorten their lives (as well as make wires and plastic connectors more likely to crack). The only reason I would consider putting it back on is if I was planning on driving through mud in it..... not likely. Also saves a teeny bit of weight.
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Old 11-22-2015, 09:34 AM   #4
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Id put it back to protect the coils from moisture.
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Old 11-22-2015, 04:21 PM   #5
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How would it protect them from moisture? So Cal car, so moisture is not a huge issue.
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Old 11-22-2015, 04:29 PM   #6
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I guess if it never rains theres no problem. But the wires going to the coils are pretty exposed under that plastic.
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Old 11-22-2015, 09:45 PM   #7
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Another pro would be that rodents are less likely to make their home there with the cover gone. They tend to nibble on things and can get very expensive.

The wires, connectors, and coils are all weather-resistant. The only viable way for water to cause an issue is if it gets under the seals of the coils and into the sparkplug tubes. Again, they are sealed to prevent this. I live in Vancouver BC. If water was an issue, I would definitely know about it.
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Old 11-22-2015, 10:45 PM   #8
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Dielectric grease on all electrical connectors, especially the spark plug tubes are a big help.
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Old 11-23-2015, 08:03 AM   #9
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Originally Posted by CoryM View Post
Another pro would be that rodents are less likely to make their home there with the cover gone. They tend to nibble on things and can get very expensive..
I ride motorcycles for 40 years and STORING a motorcycle for the winter (when it sits still for a few months) is an open invitation for this to happen. The damage they can do can be devastating.

For this reason I always recommend, especially if you live in a rural area, you put traps out for the critters. Mice cant resist peanut butter so a spring trap baited with it works a treat. But poison and sticky traps also work good. I recommend all three. Also, check the traps at least weekly and reset if (when) you catch some. If you do catch mice this will alert you to the potential problem and you better take action.

I think it unlikely for this to be a problem for something like a Yaris which is always in use. But if it sits in winter for any length of time....LOOK OUT!
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Old 12-19-2015, 12:50 AM   #10
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I haven't used the OEM cover for 5 years

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Old 12-19-2015, 07:53 AM   #11
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Quote:
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Another pro would be that rodents are less likely to make their home there with the cover gone. They tend to nibble on things and can get very expensive.
I just serviced my plugs and there were dried out kernels of corn under the plastic cover! There isn't a farm within 30 miles of my house either.
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Old 12-19-2015, 10:12 AM   #12
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Quote:
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I haven't used the OEM cover for 5 years

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Haven't used mine for 10 years. Have never had any problems with water or dirt.
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Old 12-19-2015, 01:01 PM   #13
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I've driven year around with mine removed and have had no issues.
The latest was a MI grey anodized cover adapted for the Blitz S/C. It often made a annoying buzz at idle. Rubber isolating washers didn't help so now it's on the shelf.
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Old 12-19-2015, 05:30 PM   #14
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Quote:
Originally Posted by bronsin View Post
I ride motorcycles for 40 years and STORING a motorcycle for the winter (when it sits still for a few months) is an open invitation for this to happen. The damage they can do can be devastating.

For this reason I always recommend, especially if you live in a rural area, you put traps out for the critters. Mice cant resist peanut butter so a spring trap baited with it works a treat. But poison and sticky traps also work good. I recommend all three. Also, check the traps at least weekly and reset if (when) you catch some. If you do catch mice this will alert you to the potential problem and you better take action.

I think it unlikely for this to be a problem for something like a Yaris which is always in use. But if it sits in winter for any length of time....LOOK OUT!
Engine covers for most part are just for cosmetics, hold heat and great place for mice to live I'm running with out one.

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Old 12-19-2015, 07:55 PM   #15
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Quote:
Originally Posted by Exiwolfman View Post
Engine covers for most part are just for cosmetics, hold heat and great place for mice to live I'm running with out one.

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Huh I will consider not putting mine back after Im done servicing the plugs.
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Old 12-19-2015, 09:55 PM   #16
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It slightly reduces top end engine noises
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