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| 10-24-2011, 12:08 PM | #1 |
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Cold start pop
Never fails, every time I start my car (cold start in the morning) I let it warm up letting the revs settle then I drive and from 1st to 2nd I hear an extremely loud pop. Could it be shooting a flame? I have a cat-less exhaust. Thanks guys!
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| 10-24-2011, 12:11 PM | #2 |
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It sure could be.
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| 10-24-2011, 12:25 PM | #4 |
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I'm hoping it is lol. But weirdly even when I'm driving the car hard and flying through the gears I don't get that same pop. I didn't understand why it's happening the car is still kinda cold
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| 10-24-2011, 12:42 PM | #5 |
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Same thing happens on mine, im running on catless too. Every morning when i shift from 1st to 2nd gear, it pops and barely happen when its warmed
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| 10-24-2011, 12:49 PM | #6 |
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Yea on a cold start it'll actually pop out little flames. They never exit the tips and you can't really see them, but I had a friend drive behind me one night and he said he could see little blue flames off throttle and sometimes when I shifted. Only when car is cold, or REALLY REALLY hot lol
Makes me happy 
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| 10-24-2011, 02:38 PM | #7 |
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This is opinion not science:
Cats usually remove hydrocarbons and other non-combusted material. When the engine is cold most cars run a warm-up program (rich fuel mixture). I'm guessing you have unburnt fuel entering the hot exhaust and that's where you get the pop (or flames in some case). This is only a guess but would love to hear someone with knowledge confirm or deny. |
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| 10-24-2011, 03:11 PM | #8 | |
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Quote:
I reallllly hope it shoots a flame lol  |
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| 10-24-2011, 03:26 PM | #9 |
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Mine does this also with challenge sport. My mustang also will throw flames. Kinda cool.
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| 10-24-2011, 06:43 PM | #10 |
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My cars been parked for about 3 hours think that's cold enough to experiment?
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| 10-24-2011, 07:15 PM | #11 |
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Mine will actually pop both when it's a cold start and after a normal start. If I cruise up to about 4000 RPMs, let go of the accelerator, and lightly tap the accelerator again at about 2500 RPMs, I get a really loud pop. Its especially fun in second gear cruising around campus haha. And have the Fabspeed maxflo exhaust.
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| 10-24-2011, 07:43 PM | #12 |
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Cold starts will be richer, so there will be more fuel there.
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