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2011 2.7l occasional backfire on startup??

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Old 05-15-2011, 12:07 PM   #1
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2011 2.7l occasional backfire on startup??

Does anyone experience a backfire on the 2.7l sometimes on startup?? I just bought this truck and it a has under 2,000 mi. Every once in awhile I get a backfire on startup. I came from a 4.0 v6 taco and never experienced this before.
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Old 05-15-2011, 12:30 PM   #3
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it's a very slight pop at the exact moment of startup and it usually does this after sitting for 8+ hours (cold).
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Old 05-15-2011, 12:31 PM   #4
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Sounds rich. It may not even be a backfire though. Get video of it to show the dealer.
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Old 05-15-2011, 12:37 PM   #5
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Quote:
Originally Posted by whippersnapper02 View Post
Sounds rich. It may not even be a backfire though. Get video of it to show the dealer.
If it IS a "backfire", that would be caused by improper ignition timing, and I would think a code would be set....
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Old 05-15-2011, 12:46 PM   #7
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Quote:
Originally Posted by chris4x4 View Post
If it IS a "backfire", that would be caused by improper ignition timing, and I would think a code would be set....
A rich mixture could cause fuel to build up in the exhaust. It might sound like a back fire when ignited. I bet is isn't anything though.
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Old 05-15-2011, 12:49 PM   #8
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Quote:
Originally Posted by whippersnapper02 View Post
A rich mixture could cause fuel to build up in the exhaust. It might sound like a back fire when ignited. I bet is isn't anything though.
Yeah....If an injector is leaking down, or something.....that could cause it.
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Old 05-15-2011, 12:59 PM   #9
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Mine does.

I haven't done anything about it.

Not sure if it stopped doing it or I just stopped noticing.

I have almost 10k miles on now.
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Old 05-15-2011, 01:32 PM   #10
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Quote:
Originally Posted by bjmoose View Post
Mine does.

I haven't done anything about it.

Not sure if it stopped doing it or I just stopped noticing.

I have almost 10k miles on now.
Good to know that I am not alone then!
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Old 05-15-2011, 11:28 PM   #11
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mine kind of has that sometimes, but i didn't really notice it till i put on the doug thorley catback
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Old 05-16-2011, 02:26 AM   #12
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Mine does it sometimes as well. 2011 4x2 I4. Just a very slight "pop" on start up. Only after it has sat overnight. Mine has around 1K on it.
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Old 05-16-2011, 06:11 AM   #13
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Mine does it only sometimes, Seems like its rarely in the morning when sitting overnight, just in the afternoon, starting to leaving from work, 1-2 days a week perhaps.
Its not loud either, just a light pop, not sure if its due to good muffling or just being a fraction of the fuel in a normal backfire. 20k on mine, noticed it for at least 16k.
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Old 05-16-2011, 06:35 AM   #14
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Mine did this for 80,000 since it was new, until I sold it
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Old 05-16-2011, 10:53 AM   #15
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My 2008 4 cyl does it every now and then. I wonder if this is happening to people who removed the secondary air filter. It happens to me usually on a full cold start after sitting overnight, especially after a longer run of 20+ miles.
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Old 05-16-2011, 11:42 AM   #16
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Mine 2010 2.7 4x4 did this morning. Bit cool (60's) in Houston. Biggest difference (hurry to get to work) was I did not hesitate for few seconds before trying to start. Usuallly wait 10 or 15 seconds to let computer do its magic and will start quickly (less than 2 seconds). Cranks for about 10 seconds before it caught and then popped.

bobby
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Old 05-16-2011, 11:54 AM   #18
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that means it's talking to you saying i'm ready let's go!
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Old 05-16-2011, 12:00 PM   #19
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that means it's talking to you saying i'm ready let's go!

Either that are you are feeding it c-store burritos.
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Old 05-16-2011, 01:14 PM   #20
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Quote:
Originally Posted by 91r100gs View Post
My 2008 4 cyl does it every now and then. I wonder if this is happening to people who removed the secondary air filter. It happens to me usually on a full cold start after sitting overnight, especially after a longer run of 20+ miles.
Nope. I'm completely stock from intake to exhaust tip.
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