Backfire on Startup?
Thread Starter
Instructor
Joined: Jul 2013
Posts: 208
Likes: 13
From: Benedict Maryland
Backfire on Startup?
The title says it all.
Today, for the first and only time, on cold startup after sitting in the garage all night, but on a very hot day (98+). Anybody have any clues as to what would cause this and if I should worry about it?
I'm not a mechanical expert so I figured I'd ask the professionals!
Alaskapaul
Today, for the first and only time, on cold startup after sitting in the garage all night, but on a very hot day (98+). Anybody have any clues as to what would cause this and if I should worry about it?
I'm not a mechanical expert so I figured I'd ask the professionals!
Alaskapaul
Melting Slicks
Joined: Jun 2004
Posts: 2,130
Likes: 54
From: Granbury, Pecan Plantation TX
The title says it all.
Today, for the first and only time, on cold startup after sitting in the garage all night, but on a very hot day (98+). Anybody have any clues as to what would cause this and if I should worry about it?
I'm not a mechanical expert so I figured I'd ask the professionals!
Alaskapaul
Today, for the first and only time, on cold startup after sitting in the garage all night, but on a very hot day (98+). Anybody have any clues as to what would cause this and if I should worry about it?
I'm not a mechanical expert so I figured I'd ask the professionals!
Alaskapaul
Cruising
Joined: Jun 2015
Posts: 13
Likes: 3
Backfire on Startup?
Originally Posted by Frodo
Mine doesn't "bark" at startup but will pop out of the exhaust when revving at a stop and once in a while during WOT. Anybody else have this issue? '15 base coupe A8 NPP
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Melting Slicks
Joined: Jan 2004
Posts: 2,299
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From: Fort Worth TX
St. Jude Donor '14-'15
I'm will start off with a bark sometimes also.....I believe it's the computer turning over the motor and not adding spark until it sees oil pressure. The "Bark" is the excess fuel built up in the cylinders.
Team Owner
Joined: Jan 2007
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From: cookeville tennessee
same here on the car.
Instructor
Joined: May 2015
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Instructor
Joined: May 2015
Posts: 141
Likes: 5
My theory is the same except that I suspect fuel pressure, the slow bleed of which has previously been explained as long crank-before-start times during the first start of the day. I'd accept either theory as reasonable.
Burning Brakes
Joined: Feb 2010
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From: Louisa, Ky
Pro
Joined: May 2015
Posts: 586
Likes: 124
From: Florida
Yep. Remember the "key bang" very well. Ruined lots of mufflers back in the day. The "pop" occurs with my car every morning start when the engine is cold. Has done it since day one. I love it. Lets the neighbors know I am going for a ride.