touchless car was and rpm jumping ?

rick100 · 03-04-2016, 01:49 PM

I took my car to a touchless car wash , everything was fine and I was at the rinsing stage when the rpm started dropped below 1000 to 800 and then the needle started umping between 1100 and 800. Once I left the car wash everything seemed fine...

Any ideas what could ve triggered this?

The car goes to under wash at the beginning when entering the wash station so I could see the rpm jumping there , but after it is odd

Three_thirty_I · 03-04-2016, 02:33 PM

Hope it wasn't trying to ingest water! Maybe inspect the air filter.

fravel · 03-04-2016, 02:45 PM

I've always just attributed it to high humidity from all the water vapor.

Three_thirty_I · 03-04-2016, 02:58 PM

That could very well be the case too. I am sure the MAF sensor and ECU is being nicely tripped up with this.

hassmaschine · 03-04-2016, 05:38 PM

Why is your idle 1000rpm? It should be 650 when warm.

Three_thirty_I · 03-04-2016, 05:55 PM

Was also wondering that. ^^

rick100 · 03-04-2016, 06:35 PM

The jumping rpm went away right after I left the car wash. Drove the car for 20 minutes after and it never came back.

Isn't the air filter under the hoodand in a sealed box. It would be hard for it to absorb water if it is spraying outside the car. I hope it never comes back. I'm afraid of car washes now

rick100 · 03-04-2016, 06:37 PM

Quote:

Originally Posted by hassmaschine

Why is your idle 1000rpm? It should be 650 when warm.

Yes sorry. My rpm is usually around 600 -700. I guess the rpm dropped below that. And it went up to 800. I ve been to a lot of car washes and I never had this happened before.

rick100 · 03-04-2016, 07:41 PM

So I took the car out for a drive again and the rpm is fine. I opened the hood and there is not sign of water anywhere. Air filter looks tight

The vapors from all the water is a possibility

I also found that there is a "vent" or holes on the panel beside the left tire , I m guessing those holes are meant for air circulation. Right beside the hole is a connector that I believe is attach to the air filter so it could be a sensor. I m wondering if water got in those holes and somehow to the connector or wires which made the car's rpm hesitate while it was inside the wash bay. The way the bay sprays the water I could see that happening.

03-04-2016, 01:49 PM	#1
rick100 Colonel 551 Rep 2,293 Posts Drives: 328 Join Date: Oct 2013 Location: canada iTrader: (0)	touchless car was and rpm jumping ? I took my car to a touchless car wash , everything was fine and I was at the rinsing stage when the rpm started dropped below 1000 to 800 and then the needle started umping between 1100 and 800. Once I left the car wash everything seemed fine... Any ideas what could ve triggered this? The car goes to under wash at the beginning when entering the wash station so I could see the rpm jumping there , but after it is odd
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03-04-2016, 02:33 PM	#2
Three_thirty_I Lieutenant Colonel 200 Rep 1,834 Posts Drives: '05 E90 330i Manual Join Date: Aug 2010 Location: Cape Town, South Africa iTrader: (0) Garage List 2005 BMW E90 330i [0.00]	Hope it wasn't trying to ingest water! Maybe inspect the air filter. __________________ BMW E90 330i (M) '05 (His) \| (Hers) BMW E46 320i f/l (M) '03
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03-04-2016, 02:45 PM	#3
fravel Colonel 1645 Rep 2,494 Posts Drives: Monaco Blue '06 330i Join Date: Aug 2012 Location: The Nasti 'Nati iTrader: (1)	I've always just attributed it to high humidity from all the water vapor. __________________
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03-04-2016, 02:58 PM	#4
Three_thirty_I Lieutenant Colonel 200 Rep 1,834 Posts Drives: '05 E90 330i Manual Join Date: Aug 2010 Location: Cape Town, South Africa iTrader: (0) Garage List 2005 BMW E90 330i [0.00]	That could very well be the case too. I am sure the MAF sensor and ECU is being nicely tripped up with this. __________________ BMW E90 330i (M) '05 (His) \| (Hers) BMW E46 320i f/l (M) '03
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03-04-2016, 05:38 PM	#5
hassmaschine Major General 3973 Rep 7,215 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	Why is your idle 1000rpm? It should be 650 when warm.
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03-04-2016, 05:55 PM	#6
Three_thirty_I Lieutenant Colonel 200 Rep 1,834 Posts Drives: '05 E90 330i Manual Join Date: Aug 2010 Location: Cape Town, South Africa iTrader: (0) Garage List 2005 BMW E90 330i [0.00]	Was also wondering that. ^^ __________________ BMW E90 330i (M) '05 (His) \| (Hers) BMW E46 320i f/l (M) '03
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03-04-2016, 06:35 PM	#7
rick100 Colonel 551 Rep 2,293 Posts Drives: 328 Join Date: Oct 2013 Location: canada iTrader: (0)	The jumping rpm went away right after I left the car wash. Drove the car for 20 minutes after and it never came back. Isn't the air filter under the hoodand in a sealed box. It would be hard for it to absorb water if it is spraying outside the car. I hope it never comes back. I'm afraid of car washes now Last edited by rick100; 03-04-2016 at 06:43 PM..
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03-04-2016, 07:41 PM	#9
rick100 Colonel 551 Rep 2,293 Posts Drives: 328 Join Date: Oct 2013 Location: canada iTrader: (0)	So I took the car out for a drive again and the rpm is fine. I opened the hood and there is not sign of water anywhere. Air filter looks tight The vapors from all the water is a possibility I also found that there is a "vent" or holes on the panel beside the left tire , I m guessing those holes are meant for air circulation. Right beside the hole is a connector that I believe is attach to the air filter so it could be a sensor. I m wondering if water got in those holes and somehow to the connector or wires which made the car's rpm hesitate while it was inside the wash bay. The way the bay sprays the water I could see that happening.
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