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Slight Idle Bump

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Old Oct 30, 2009 | 07:18 PM
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Default Slight Idle Bump

I have a stock 2000 TA with basic bolt ons. When my car idles it has a slight bump every few seconds. I was wondering where I should start looking are why it is doing that? I will try and record it and post to see what you guys think.
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Old Oct 31, 2009 | 01:10 PM
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I have also noticed that my idle doesnt come down quickly qhen i push in the clutch it actually ramps up to 1100-1700 depending on how fast i am going. them slowing comes back down to normal of about 800rpm. I did just replace my coolant sensor. This may be a completly different issue, but it just started happening and I didn't think to post it before. Also my check engine light comes on occasionaly.
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Old Oct 31, 2009 | 06:38 PM
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check for vacuum leaks.
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Old Oct 31, 2009 | 08:42 PM
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What do you mean a bump, like you can feel it shaking in the car? If so, I'd say motor and trans mounts
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Old Oct 31, 2009 | 11:13 PM
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I have the same problem. Its like a slight miss, with no check engine like. I put it on misfire counter, and it picks up nothing... Every few seconds, I feel it through the chassis... new plugs and wires. I havnt figured it out yet.
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Old Nov 1, 2009 | 06:50 AM
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Originally Posted by 98pontiac
I have the same problem. Its like a slight miss, with no check engine like. I put it on misfire counter, and it picks up nothing... Every few seconds, I feel it through the chassis... new plugs and wires. I havnt figured it out yet.
That is exactly what it seems like?? It will idle fine then just feel like there is a hiccup in the idle. It is very odd.

I have HPTuner and tried to log some info on it but it doesn't show up my normal logging parameters, cyl air mass, air/fuel, maf, map, etc.... Maybe i'm not looking at the right ones, man its getting to be a bitch this one just has me fooled for now. lol
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Old Nov 1, 2009 | 07:13 AM
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I have this problem also, but I never worry about it since the car runs sooo good.

I don't get the SES light, if if you are getting it occasionally, do you have any stored codes?
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Old Nov 1, 2009 | 11:53 PM
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I also get a noisey lifter every once in a while. With that, i figure that might be causing it as well. Otherwise I dont worry about it to much. it does run really good other than that. Hopefully this winter ill get a cam, then I REALLY wont notice a slight bump in the motor.
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Old Nov 9, 2009 | 12:44 PM
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Its definetly a miss. Its been getting worse and now is starting to backfire sometimes. I did the !AIR and !EGR and put breathers on the valves and a catch can where the EGR was. Is there something wrong with the EGR somehow? Or could the fuel pump or regulator have gone bad? I am getting a P0300 code so it is not just one cylinder.
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