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Backfiring/popping under boost

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Old 10-24-2008, 12:40 PM
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HMTguy
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Default Backfiring/popping under boost
I have had zero time lately this semester to work on my car, but lately it has been popping at boost levels above 12 psi. If I keep the boost low it's fine. I just want to know if you guys have experienced it and what the cause was.

I'm just going to guess it's too rich due to the colder air this time of year, but who knows. I haven't even had time to hook up my wideband up and check
 
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Old 10-24-2008, 02:59 PM
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Default Re: Backfiring/popping under boost
spark blowout. put in fresh plugs gapped to .028 and see what she says.
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Old 10-24-2008, 03:06 PM
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Default Re: Backfiring/popping under boost
No, that's not it. Spark blowout would just cause misfiring, not backfiring and loud *** popping noises.

The plugs are gapped at .025"
 
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Old 10-24-2008, 03:57 PM
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Default Re: Backfiring/popping under boost
so when you put in fresh plugs it continues?
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Old 10-24-2008, 04:19 PM
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Default Re: Backfiring/popping under boost
cold air makes you run leaner unless you're tune is offset for it.
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Old 10-24-2008, 04:30 PM
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Default Re: Backfiring/popping under boost
Originally Posted by stenseltizm
cold air makes you run leaner unless you're tune is offset for it.
Thanks captain obvious. What the hell do you mean "offset"
 
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Old 10-24-2008, 04:39 PM
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Default Re: Backfiring/popping under boost
Just thought maybe you were getting it backwards cause of this
Originally Posted by jagojon3
I'm just going to guess it's too rich due to the colder air this time of year, but who knows.
Wouldn't the iat correction table handle this?
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Old 10-24-2008, 07:32 PM
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Default Re: Backfiring/popping under boost
make sure your map sensor is happy. Also any cel's?
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Old 10-24-2008, 07:43 PM
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No CELs, don't think there's any problem with the map sensor...
 
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Old 10-24-2008, 10:25 PM
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Default Re: Backfiring/popping under boost
How old are your ignition parts cap/rotor/plugs/wires?
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