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jim
Dodge Dakota
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11/16/2007
19:55:02
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 Subject: backfire or something
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Message:
I have a 96 3.9l and i just got done doing with some modifications and now i have this noise. The modifictions i did was a V8 throttle body, and there was no problems. Then I changed the radiator, fan, and thermostat. Now if I am in netural or parked and I punch the gas and immediately let off it sounds like it backfires or misses or something.
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nice1
Dodge Dakota
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11/17/2007
03:01:02
| RE: backfire or something
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Message:
yup, sounds like a backfire. my 3.9 does it too and the intake is all stock. for some reason you can't gun them, at least mine anyways. mine is a little less likely to do it after its warmed up. Don't know what causes it, i'm not a mechanic but haven't noticed anykind of damaging side affects from it.
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dakota49
Dodge Dakota
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11/17/2007
10:37:34
| RE: backfire or something
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Message:
Does it sound like its back firing through the intake, or the exhaust?
Dakota49
1988 3.9 4X4 5speed
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jim
Dodge Dakota
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11/17/2007
14:34:28
| RE: backfire or something
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Message:
exhaust, definitely through the exhaust
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dakota49
Dodge Dakota
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11/17/2007
20:36:35
| RE: backfire or something
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Message:
I'm just guessing, but I bet you put a 180 degree thermostat in, in some cases it can cause some problems, but I'm not sure that it would cause it back fire through the exhaust. There are a couple of things that can cause back firing in the exh. 1) a plug misfired and the fuel goes into the exh, then burns causing a back fire. 2) you are getting incomplete combustion and after a little unburned gas gets into the exh. again it fires. or rather it explodes in the exh. instead of the combustion chamber where its supposed to.
Since you have a 96, run the codes and see what you get. You may get a code for "Engine too cold for too long"
Other than that I can't think of anything else at the moment.
Good Luck
Dakota49
1988 3.9 4X4 5speed
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jim
Dodge Dakota
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11/21/2007
23:10:57
| RE: backfire or something
IP: Logged
Message:
thanks for the info
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