S2000 Under The Hood S2000 Technical and Mechanical discussions.

Idle Still Stumbles

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Old 08-12-2013, 07:00 AM
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Default Idle Still Stumbles

Hey Guys,

I wanted to get your opinion on what my next plan of action is. My idle is still stumbling a bit when I am revving the car and letting it go back to idle. I've already done the following:

1) Clean out the IAC valve
2) MAP wack
3) Valve adjustment

After the valve adjustment this weekend I feel that it is a bit better. It doesn't stumble as often nor does it seem to stumble to almost stalling out. Should I just replace the MAP sensor at this point?

MY: 2001
Miles: 80K
Old 08-13-2013, 06:29 AM
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bUMP
Old 08-13-2013, 09:04 AM
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When I had this problem it was an aftermarket TPS causing it. I just replaced my throttle body with one that had an OEM TPS and it idles perfect with no vibrations/shivers now.
Old 08-14-2013, 04:19 AM
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just addressed one of these problems on a friends 05. we cleaned the IAC, MAP and air filter. check your spark plugs. i had to change his spark plug seals since they were severly worn out and disfigured and oil was getting through.
Old 08-16-2013, 10:46 PM
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Haven't heard of the TPS being jacked.

I recently changed my plugs.

So now it's a toss up between the TPS and the MAP...
Old 08-17-2013, 06:54 AM
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Originally Posted by super_mut
Haven't heard of the TPS being jacked.

I recently changed my plugs.

So now it's a toss up between the TPS and the MAP...
Is your TPS pointed towards the floor or upwards?
Old 08-18-2013, 11:35 AM
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Zip tie the MAP to make sure the connection is good, than do a ECU reset, and check back. I had stalling/bad idle issue and I did this and no more.
Old 08-18-2013, 02:55 PM
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Originally Posted by EnvyMyS2K
Originally Posted by super_mut' timestamp='1376721986' post='22729340
Haven't heard of the TPS being jacked.

I recently changed my plugs.

So now it's a toss up between the TPS and the MAP...
Is your TPS pointed towards the floor or upwards?
My TPS is pointed upwards.

Originally Posted by AZ-S2000
Zip tie the MAP to make sure the connection is good, than do a ECU reset, and check back. I had stalling/bad idle issue and I did this and no more.
I did this already, sadly it didn't do very much.
Old 08-19-2013, 05:38 AM
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check your throttle cable adjustment. if there is more than 1/4 on an inch deflection try adjusting it. There is also an adjustment screw for the TPS. take off your intake clean the TB.

adjust your cables!
Old 08-19-2013, 07:11 AM
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Originally Posted by iamxpL
check your throttle cable adjustment. if there is more than 1/4 on an inch deflection try adjusting it. There is also an adjustment screw for the TPS. take off your intake clean the TB.

adjust your cables!
I have trouble believing it would be slack in the pedal.


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