Rain causing misfire?
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New User
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Rain causing misfire?
I'm a beginner and haven't done much work on trucks or cars but would really love to learn for the future so please excuse how little I know.
After/during the rain, every other time my truck loses considerable power to accelerate. It's not consistent but happens increasingly often. As I accelerate up to ~ 50km/h (also when I reverse), my engine will shake the entire truck. Past 50 it "appears" to go away. Typically this will last up to 10 mins and will disappear and run fine again. The last time it happened the check engine light came on and went away the next day. After reading online, I've heard about the "COP" connection?? Any advice would be appreciated.
Worst comes to worst I'll take it into my mechanic but I'd kind of like to learn
Thanks
2003 Ford F-150, 4.6L Triton V8 XL, 2WD
After/during the rain, every other time my truck loses considerable power to accelerate. It's not consistent but happens increasingly often. As I accelerate up to ~ 50km/h (also when I reverse), my engine will shake the entire truck. Past 50 it "appears" to go away. Typically this will last up to 10 mins and will disappear and run fine again. The last time it happened the check engine light came on and went away the next day. After reading online, I've heard about the "COP" connection?? Any advice would be appreciated.
Worst comes to worst I'll take it into my mechanic but I'd kind of like to learn
Thanks2003 Ford F-150, 4.6L Triton V8 XL, 2WD
More Turbo
Joined: Aug 2011
Posts: 544
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I'm a beginner and haven't done much work on trucks or cars but would really love to learn for the future so please excuse how little I know.
After/during the rain, every other time my truck loses considerable power to accelerate. It's not consistent but happens increasingly often. As I accelerate up to ~ 50km/h (also when I reverse), my engine will shake the entire truck. Past 50 it "appears" to go away. Typically this will last up to 10 mins and will disappear and run fine again. The last time it happened the check engine light came on and went away the next day. After reading online, I've heard about the "COP" connection?? Any advice would be appreciated.
Worst comes to worst I'll take it into my mechanic but I'd kind of like to learn Thanks
2003 Ford F-150, 4.6L Triton V8 XL, 2WD
After/during the rain, every other time my truck loses considerable power to accelerate. It's not consistent but happens increasingly often. As I accelerate up to ~ 50km/h (also when I reverse), my engine will shake the entire truck. Past 50 it "appears" to go away. Typically this will last up to 10 mins and will disappear and run fine again. The last time it happened the check engine light came on and went away the next day. After reading online, I've heard about the "COP" connection?? Any advice would be appreciated.
Worst comes to worst I'll take it into my mechanic but I'd kind of like to learn
Thanks2003 Ford F-150, 4.6L Triton V8 XL, 2WD
You need to scan this truck for a stored or a pending code/codes
Guessing with this will just cost you money on parts you don't need
Get the codes and we will be able to help you
Lead Driver
Joined: Sep 2006
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Look at the seal, hood to cowal allowing water to leak onto the rear cylinder plug wells or some source of water getting to that area.
If the missfire clears up then returns with rain, that all the problem you have.
Don't rule out moisture coming in through the radiator and causing the issue if the plug boots and well seal is not good.
Good luck.
If the missfire clears up then returns with rain, that all the problem you have.
Don't rule out moisture coming in through the radiator and causing the issue if the plug boots and well seal is not good.
Good luck.
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Thanks for the replies. I'll see about investing in a code reader and let you know if I can get my hands on one. From reading online it sounded as though water leaking in was the cause of the problem. I'll take a look while I try and get a reader. Thanks again
Senior User
Joined: Mar 2013
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"AutoZone"'s check them for free i think, and if your state has emissions test then most of your local garages will pull the codes for about 15$ i think.
For a "backyard" test of rain water missfires you could try misting over your plugs and cop with water from a spray bottle in the dark, not foolproof but it could detect a bad/worsening voltage leak problem faster than the naked eye with dry atmosphere
For a "backyard" test of rain water missfires you could try misting over your plugs and cop with water from a spray bottle in the dark, not foolproof but it could detect a bad/worsening voltage leak problem faster than the naked eye with dry atmosphere
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