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Old 09-19-2005, 07:24 PM   #1 (permalink)
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Default What causes my car to shake when in idle? (I need real help!)

When I stop at a light or stop sign, my car vibrates. When i put the car in park or neutral the shaking goes away. The seats and steering wheel vibrates. When I turn the a/c on, it shakes even worse. I cant even lay my head on the headrest due to the annoying shaking. I replaced the fuel injectors, replaced fuel filter, MAF, new spark plugs Bosch Platinum +4 from warn out Hyundai dealership NKGs. I even had the dealership check the shaking out. They said my engine mounts were not broken and were good. They couldnt find anything wrong.

I noticed after installing the new spark plugs, the idle is about 40% better, but its still there. I even changed my stock intake to one of those $9.99 CAI from ebay to try to fix the issue. Shaking still here.

I had two questions:

1. The $9.99 CAI from ebay comes with a blue cone/filter. My question is it worth to replace this cheap cone with a $50 K & N filter from Autozone, will I get better performance? I also notice I wheezing noise coming from that blue cone. Could it be the cheap material on the cone killing air performance?

2. What should i check for the shaking? Im planning just to bring it in to this Tires Plus, since the guy said he could check it out for $12.

[Edited by qb2k5 on Sep 19, 2005 4:26 PM]
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Old 09-19-2005, 07:27 PM   #2 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

Check the vacuum hoses, especially the ones that goto the idle speed actuator.
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Old 09-19-2005, 07:57 PM   #3 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

Is the idle speed thing screwed to the right strut on top?

What about the cone? Should I get a K and N one?
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Old 09-19-2005, 11:20 PM   #4 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

a real simple cheap solution could be your spark plug wires i use to have some bad idleing problems, and coulnd't figure it out; the plugs were new. so i changed the wires and the problem was fixed.
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Old 09-20-2005, 10:24 PM   #5 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

Ok, I try that suggestion.

Damn I just got my wires factory replaced by the dealership about 5 months ago.
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Old 09-21-2005, 03:01 AM   #6 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

it is your idle air control. and no it is not on the strut tower. that is your acceleration sesnor
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Old 09-22-2005, 12:55 PM   #7 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

on the strut tower it is a knock sensor
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Old 09-23-2005, 02:05 AM   #8 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

no it is not. the knock sensor is located in the block in a coolant passage. on the strut tower it is the aqcceleration sensor. i lets the ECU know when there is a lot of road vibration so it does not assume it is engine knock and adjust the timing. i guess you can say it is a knock sesnor aid. but it is not a knock sesnor
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Old 09-23-2005, 06:25 AM   #9 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

Is my picture correct?

http://img391.imageshack.us/img391/5069/isahelp8ac.gif

Is the idle air control the same thing as the ISA or Idle Speed Actuator?

[Edited by qb2k5 on Sep 23, 2005 3:28 AM]
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Old 09-23-2005, 10:18 AM   #10 (permalink)
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Default Re: What causes my car to shake when in idle? (I need real help!)

on the right is the MAF/IAT and on the left is your TPS.
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