S2000 Under The Hood S2000 Technical and Mechanical discussions.

RPM Problem

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Old 12-27-2008, 11:51 PM
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Angry RPM Problem

So its been happening 2-3 weeks after I got my Cold Air intake.
The RPM goes up and down constantly and when I try to drive on it the car jumps ( I mean jumps as in it feels like the car is accelerating than all of a sudden a hard brake )
I got it to stop after turning the engine on and off a few times but this morning I couldn't even go to work because my car just would not stop doing that. Any ideas why my RPM is just jumping back and forth? It sounds like I'm reving the car over and over and over and over when its on neutral.
Someone help me out!
Old 12-28-2008, 01:05 AM
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check the connection on the water temp sensor
Old 12-28-2008, 01:30 AM
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you have a leak. loose tube. loose air filter. something's not connected properly.
Old 12-28-2008, 02:40 AM
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sounds like a vaccum line is leaking to me... IAC trying to compensate causes it...
Old 12-28-2008, 06:26 AM
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Don't we have a mass airflow or pressure sensor (MAF or MAP) on the intake? You might have messed with the connection, messed up your sensor (e.g. with too much oil on an oiled air filter), or have a leaky CAI connection.
Old 12-28-2008, 10:07 PM
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So any pictures on where I should look exactly would help me alot because I don't understand exactly what you guys are saying :/. Help me out here. Thanks for the replies though
Old 12-28-2008, 11:58 PM
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check your connections...are all the stock hoses connected to something? are they connected to the right place? are the connections nice and air-tight? are the hoses leaky (cracked?)
Old 12-29-2008, 12:05 AM
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Try a "map whack" and reset reset the ECU while you're at it.
Old 12-29-2008, 12:07 AM
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could be the iacv...see if you can unplug it
Old 12-29-2008, 02:13 PM
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I think I figured it out ..
There was a hose right below the CAI that leaked some type of fluid I think it was coolant I just went to autozone and picked up 2 feet of another hose and a pack of 4 clamps that will hold it tight and replaced it and no more Rev jumps and jerky car movements as of yet.
What I'm worried about is the rubber tube getting too hot and expanding and exploding or something. I'm not sure if the black rubber tube I bought from autozone can handle hot coolant running through it. Any ideas?


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