1st Gen Neon 1995 through 1999 Neons

Car runs like a raped ape on rainy days..

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  #11  
Old 09-12-2007, 03:25 AM
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Default RE: Car runs like a raped ape on rainy days...WHY?

ORIGINAL: 12 volt

humidity can actually reduce air density and performace

http://www.rallycars.com/Cars/WaterInjection.html

http://www.snowperformance.net/
I agree but the way it was explained to me is that barometric pressure from outside can be the difference.
 
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Old 09-12-2007, 07:17 AM
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Default RE: Car runs like a raped ape on rainy days...WHY?

humid air expands more when its heated from compression, giving you a higher compression ratio.. not much, but enough to notice it running better. water expands bigtime when its heated.
a turbo car you can really tell the difference from a hot 90* day from a foggy cold night.
 
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Old 09-12-2007, 02:13 PM
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Default RE: Car runs like a raped ape on rainy days...WHY?

what i was trying to say is humidity is diffrent form water injection. By having more humidity you are going to have less air in the fuel charge and less fuel (less air denisty). this is why people make CAI so they can have a cooler densor charge.

http://en.wikipedia.org/wiki/Density_of_air
 
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Old 09-12-2007, 06:17 PM
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Default RE: Car runs like a raped ape on rainy days...WHY?

Isnt there anything that the PCM can do to compensate for this? My sisters Grand Am always has consistant power no matter the weather and I'm thinking maybe they havesmarter pcm's lol.
 
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Old 09-12-2007, 11:38 PM
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Default RE: Car runs like a raped ape on rainy days...WHY?

Somebody was very nice and PM'ed me andcomfirmed my theory:

The IACmotor controls changes in Barometric Pressure (among other things, but I'm just concerned with barometric pressure) in conjunction with the throttle position sensor and the IAT sensor among other sensors..

From what I was toldthe IACcould be the reason for the inconsistant throttle response and extreme changes in power.

http://www1.autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/80/19/8e/9b/0900823d80198e9b.jsp

http://www1.autozone.com/az/cds/en_us/0900823d/80/19/8f/5c/0900823d80198f5c/repairInfoPages.htm
i think you might be on the right track. try and find a way to test thows sensors
 



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