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post #1 of 25 (permalink) Old 07-05-2008, 03:56 PM Thread Starter
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A few questions and maybe a problem

Recently I have installed some new components to my car, which are NGK Iridium spark plugs, and a K&N SRI. Both are great additions to the car, but on thing I have noticed recently is that when I am at a stand still the car will "stumble" or make a strange vibration. I've consulted a Chilton cobalt manual to find out what the issue may be. And so far it looks like it could be a few things, but nothing for sure. One that did cross my mind was the spark plug gapping as NGK's site said to make the gap at 0.52 in. for my '05 ls. I first I thought that seemed kind of like an extreme gap, test drove it, and it seemed fine. Today I gapped them at the 0.40 in. (stock gap setting), and the car will still make the sudden vibration repeatedly. One friend said that it may be the clutch slipping or it lost a tooth, something like that, but still not quite sure. Another that crossed my mind was the fuel filter, as my car has about 37k, and may be due for replacement. Any information or advice that anyone can give would be great. And I did try searching in the forums already for this stuff. Thanks and glad to back on the forums.
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post #2 of 25 (permalink) Old 07-05-2008, 04:38 PM
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when you changed the plugs did you make sure that they were all gapped the same,? and did you replace the wires too? did you use any antirust electrical grease?

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post #3 of 25 (permalink) Old 07-05-2008, 06:37 PM
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If the vibration came only after installing the spark plugs I would suspect them. Did you make sure the coil pack is sitting on the spark plugs correctly? Any chance you cracked the ceramic section of one of the spark plugs? Usualy when a spark plug shorts out you feel it most under initial acceleration. Can you scan the ECM for codes? If not how about taking the car to Autozone and asking them to check for codes.

Hard to diagnose over the internet...LOL!

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post #4 of 25 (permalink) Old 07-05-2008, 07:01 PM Thread Starter
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I gapped them at the same time and used a wire gapping tool, and I'm not sure if we can replace any wires on 2.2L can we? The only thing I can think of that we can replace is the ignition control module, since the 2.2L uses that coil pack assembly and not an individual coil assembly like the 2.4L or the 2.0L.

Responding to 07RedSSNA, I'm pretty sure they went in correctly else I don't think the engine would have started and when I took out the spark plugs a second time I inspected all of them and took put great care into handling them especially since they have the sensitive iridium tips. However, I have thought about going to Autozone or Kragen since Pepboys, wants to charge me $90 to diagnose the engine.
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post #5 of 25 (permalink) Old 07-06-2008, 09:24 PM
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no way!

go to autozone. i threw a cel just last night went to autozone and 15 mins and ZERO dollars later i had the code cracked and fixed!

autozone ftw
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post #6 of 25 (permalink) Old 07-07-2008, 09:54 AM
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One other problem may be a bad plug all together. I put those NGK's in a car all gapped the same and one plug crapped out on me in a few hours. In my opinion these are just overpriced crap, just go back to autozone and get the stock plats. These run just as good. If it still has the same problem then you know its something else.
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post #7 of 25 (permalink) Old 07-07-2008, 10:12 AM Thread Starter
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Well, I went to AutoZone and they lent me a code reader for free which was pretty cool, only thing was that I didn't get any error messages when the car was on or off. Later that day I inspected them for the last time looking for any cracks in the ceramic shielding and surely enough by the time I got to the last plug on the right it looked it had two cracks! (very thin though) I told them about the vibrations and the cracks on the plug and they said that is what could be causing the misfiring. So now I have to order a new plug and replace the cracked one.

One question I have is that should I use the factory gap @ .040 or should use NGK's gap @ .052?
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post #8 of 25 (permalink) Old 07-07-2008, 06:09 PM
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first thing is first. get rid of the plugs and get yourself a set of acdelco. your car is set up from the factory with acdelcos and that what it will run the best on. I had the ngk's and that cooked my tower and coilpack along with my ignition control module. My cobalt with 30,000 miles on it left me on the side of the ohio turnpike. i went back to ac's and the are the best.
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post #9 of 25 (permalink) Old 07-07-2008, 07:13 PM Thread Starter
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What about the Bosch Platinum 4 or the IR Fusions, will those work or will they cause problems too? I just want to avoid having to pay nearly $14 a pop for those acdelcos and I think I found a wire set for my car so I'll be looking into those too. Thanks for warning ahead of time though.
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post #10 of 25 (permalink) Old 07-07-2008, 08:26 PM
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why did you change your spark plugs in the first place?
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