what causes a backfire during starting?
Thread Starter
Banned
Joined: Jul 2001
Posts: 3,604
From: Milton, FL
what causes a backfire during starting?
getting out of work today i cranked the car and suddenly i heard it backfire as it started, and it launched the car forwards...
everything seems fine, still idles good, no wierd noises... but wtf? its always had a hard start but this scared the crap out of me.
everything seems fine, still idles good, no wierd noises... but wtf? its always had a hard start but this scared the crap out of me.
Registered User
Joined: Sep 2002
Posts: 2,481
From: Arlington, VA
what usually causes a backfire is built up fuel or flooding. I would seafoam the car through the brake booster line. Then if it doesn't get better look at the plugs if you haven't changed them in a while, then wires, then go bigger like opti-spark. I'm not saying change all this stuff, just visually inspect it. Spark Plugs are more then likely the cause. Good Luck.
By-the-way: I still can't imagine how your car lurched forward....its just isn't possible....who knows
By-the-way: I still can't imagine how your car lurched forward....its just isn't possible....who knows
Thread Starter
Banned
Joined: Jul 2001
Posts: 3,604
From: Milton, FL
Originally posted by scoobysnax83
Hey I just noticed you go to UCF, Do you know a girl named Briana Dean? Just wondering later.....
Hey I just noticed you go to UCF, Do you know a girl named Briana Dean? Just wondering later.....
spark plugs are getting replaced this weekend when i do longtubes... i'm thinking i might have a leaky fuel injector that let fuel flood a cylender over the course of 8 hours while i was at work... sound plausable?
Registered User
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Sometimes you can get a "cough" out the intake if you let go of the key too soon just as the engine begins to start. It's not like a real backfire, though. The engine then takes a little more cranking to clear that out, then runs and subsequently starts fine.
As for the car lurching, I have noticed a few time with my A4 that it will seem to momentarily nudge forward when in PARK. I believe it was at startup also. I don't know why. Perhaps it has something to do with one of the electrically controlled solenoids.
As for the car lurching, I have noticed a few time with my A4 that it will seem to momentarily nudge forward when in PARK. I believe it was at startup also. I don't know why. Perhaps it has something to do with one of the electrically controlled solenoids.
Thread Starter
Banned
Joined: Jul 2001
Posts: 3,604
From: Milton, FL
Originally posted by shoebox
Sometimes you can get a "cough" out the intake if you let go of the key too soon just as the engine begins to start. It's not like a real backfire, though. The engine then takes a little more cranking to clear that out, then runs and subsequently starts fine.
As for the car lurching, I have noticed a few time with my A4 that it will seem to momentarily nudge forward when in PARK. I believe it was at startup also. I don't know why. Perhaps it has something to do with one of the electrically controlled solenoids.
Sometimes you can get a "cough" out the intake if you let go of the key too soon just as the engine begins to start. It's not like a real backfire, though. The engine then takes a little more cranking to clear that out, then runs and subsequently starts fine.
As for the car lurching, I have noticed a few time with my A4 that it will seem to momentarily nudge forward when in PARK. I believe it was at startup also. I don't know why. Perhaps it has something to do with one of the electrically controlled solenoids.
hmmm maybe i have some sort of wierdo short causing electrical things to act strange...
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