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Old 10-12-2011, 09:43 PM
 
158 posts, read 909,297 times
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Ok, so there has been some debate amongst some techs I know bout not having your gas cap on. Some say it can do some damage to your engine or some sensors...the main one I've heard techs blaming O2 sensor failure on it...while others say its just polution to the air if you leave it open.

I take the side with polution only, I don't see how it would really cause damage to any components.

What you think? If you think otherwise, do you have any website to back up your thinking cuz I'd love to get to the bottom of this.
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Old 10-12-2011, 10:27 PM
 
Location: Eastern NC
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With my wife's CRV, leaving the gas cap off will cause the check engine light to come on.
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Old 10-13-2011, 06:53 AM
 
Location: Northern MN
3,869 posts, read 15,210,354 times
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No damage, just a CEL from the emissions system.
Who are these techs, are they your teachers or just some water cooler talk?

I'd be more concerned with water or dirt entering the system and causing damage.


Ps Boy, I sure hope I answered it correctly, wouldn't want to be taken to task for giving out to much info.
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Old 10-13-2011, 09:20 AM
 
14,780 posts, read 43,859,535 times
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No damage to the car at all. The gas cap is there to prevent fuel vapors from escaping into the air. They are a required part of the emissions system, hence the tripping of the CEL when it's not on, but it will cause no damage whatsoever.
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Old 10-13-2011, 09:43 AM
 
Location: East of Seattle since 1992, 615' Elevation, Zone 8b - originally from SF Bay Area
44,961 posts, read 82,060,860 times
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Quote:
Originally Posted by NJGOAT View Post
No damage to the car at all. The gas cap is there to prevent fuel vapors from escaping into the air. They are a required part of the emissions system, hence the tripping of the CEL when it's not on, but it will cause no damage whatsoever.
Agreed. The worst thing it will do is cause the check engine light bulb to burn out prematurely from being on all the time.
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Old 10-14-2011, 03:50 PM
 
33,387 posts, read 35,004,652 times
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Quote:
Originally Posted by Hemlock140 View Post
Agreed. The worst thing it will do is cause the check engine light bulb to burn out prematurely from being on all the time.
we seem to have an agreement here. the only other issue with runnning no gas cap is that it is easier to steal fuel from your tank.
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Old 10-14-2011, 04:54 PM
 
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My dad's 07 accord just shown a check fuel cap indication on the odo display. Once the cap is tighten, the fuel cap display will go away in a few days.
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Old 10-15-2011, 05:17 PM
 
Location: Victoria TX
42,410 posts, read 87,339,757 times
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Quote:
Originally Posted by Hemlock140 View Post
Agreed. The worst thing it will do is cause the check engine light bulb to burn out prematurely from being on all the time.
I'd sure never want that to happen. How would my car fail inspection if the light was burned out?

Somehow, I suspect that the very last thing in a car that would fail would be the bulb in the light that alerts the inspectors to fail the car. Is there any thing else I can do to make that light bulb burn out, besides dismantle the whole dashboard and remove the bulb? There is probably a backup warning system that warns that he CEL bulb is malfunctioning.
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