Engine revving in neutral
08-20-2018, 02:26 AM
#1
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Location: NY
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Engine revving in neutral
Hey all!
I have a 2012 manual transmission, and I drove it on a two hour highway trip. I usually go about 75, so I stayed in 6th gear for most of the trip. I did drive into some torrential rain, and it was so bad we all slowed down probably below 45. I noticed however when I exited the highway, as I downshifted and put it in neutral to stop at a light, the RPMs were bouncing from about 1000 to 2000, as if I were hitting the gas pedal to rev the engine. I double checked where my right foot was just in case it was actually me, but it was definitely the vehicle. When I got to my destination and pulled into a parking spot it did the same, I reversed it to straighten out, put it back in neutral and there was no revving.
Any ideas of what could have caused this?
I have a 2012 manual transmission, and I drove it on a two hour highway trip. I usually go about 75, so I stayed in 6th gear for most of the trip. I did drive into some torrential rain, and it was so bad we all slowed down probably below 45. I noticed however when I exited the highway, as I downshifted and put it in neutral to stop at a light, the RPMs were bouncing from about 1000 to 2000, as if I were hitting the gas pedal to rev the engine. I double checked where my right foot was just in case it was actually me, but it was definitely the vehicle. When I got to my destination and pulled into a parking spot it did the same, I reversed it to straighten out, put it back in neutral and there was no revving.
Any ideas of what could have caused this?
08-20-2018, 05:17 PM
#2
Maybe the rain got some humidity / moisture on the MAF Sensor..the sensor that is on your air intake. The ECU could have flipped out, but it would have thrown an engine light.
Also do you have a Cold Air Intake?
I have been driving Manual tC's since 2005 and never experienced your issue.
Also do you have a Cold Air Intake?
I have been driving Manual tC's since 2005 and never experienced your issue.
Last edited by MR_LUV; 08-20-2018 at 07:16 PM.
08-20-2018, 10:37 PM
#3
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Join Date: Jul 2018
Location: NY
Posts: 15
Maybe the rain got some humidity / moisture on the MAF Sensor..the sensor that is on your air intake. The ECU could have flipped out, but it would have thrown an engine light.
Also do you have a Cold Air Intake?
I have been driving Manual tC's since 2005 and never experienced your issue.
Also do you have a Cold Air Intake?
I have been driving Manual tC's since 2005 and never experienced your issue.
My first thought was if the water had messed up any sensors, but I wouldn't know what to check.
08-21-2018, 04:07 PM
#4
The only time I've seen a manual rev in neutral is when the throttle body gets disconnected coz it doesn't know what to do (this is usually from forgetting to plug it back in after maintenance/upgrades). I'm partial to thinking it's either dirty or the MAF got dirty/wet as well. A dirty MAF will make the car do all kinds of weird things.
08-23-2018, 03:26 PM
#5
I am on the MAF bandwagon. I have almost hydro-locked before because I had a Cold Air Intake during a bad storm. I was able to take a hair dryer to dry the Filter and MAF and things were fine after about a day. OP, You should clean your MAF sensor, but do it right or you will kill a $200 sensor.
Give your Throttle Body a quick overview to make sure a wire did not get chewed up or get disconnected.
Also I love my Cold Air Intake. During the summer there is a 60+ degree difference between Engine Bay air and Outside Air.
Give your Throttle Body a quick overview to make sure a wire did not get chewed up or get disconnected.
Also I love my Cold Air Intake. During the summer there is a 60+ degree difference between Engine Bay air and Outside Air.
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