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Old 06-21-2013, 04:18 PM   #1
rberns


 
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Car shaking

Yesterday I took the Camaro out of the garage for a little drive. When I came to a stop light it seemed like the car would vibrate a little more than usual and then it would settle back down. When I would get on the throttle the exhaust started crackling. I put on some American Racing Headers about 150 - 200 miles ago, but during those miles it never crackled before.

I still have not gotten around to getting the car tuned yet. Any ideas on what is causing this? I understand the exhaust popping on when slowing down, but never expected it to pop while getting on the throttle.

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Old 06-21-2013, 04:20 PM   #2
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Get it tuned.


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Old 06-21-2013, 04:37 PM   #3
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Get it tuned.


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Sell him your AFM delete.
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Old 06-21-2013, 04:39 PM   #4
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Maybe running lean cause of the headers. Get it tuned.... I mean hey... with my cam my car shakes and pops all the time! LOVE it.
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Old 06-21-2013, 05:11 PM   #5
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Sell him your AFM delete.
My range is up for sale.


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Old 06-21-2013, 06:57 PM   #6
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Maybe running lean cause of the headers. Get it tuned.... I mean hey... with my cam my car shakes and pops all the time! LOVE it.
From my understanding headers won't make you go lean, but a cold air intake would. However, from what I have read Cold Air Inductions wont screw up your AFR.
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Old 06-21-2013, 07:02 PM   #7
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From my understanding headers won't make you go lean, but a cold air intake would. However, from what I have read Cold Air Inductions wont screw up your AFR.
But maybe a combination of both can cause an issue?


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Old 06-21-2013, 07:05 PM   #8
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True, but while sitting idle at a stop sometimes the engine will drop into 4 cyl mode or under a light load and this can cause some vibration as well as exhaust note / tone changes which with a factory exhaust is not as noticeable. The range device makes the engine stay in 8 cyl mode ... always and does not mess with the factory tune.
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Old 06-21-2013, 07:08 PM   #9
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Originally Posted by Sftshldr View Post
True, but while sitting idle at a stop sometimes the engine will drop into 4 cyl mode or under a light load and this can cause some vibration as well as exhaust note / tone changes which with a factory exhaust is not as noticeable. The range device makes the engine stay in 8 cyl mode ... always.
This is true, I forgot about that. That's the reason the L99 has the flexible cats. OP, you may be feeling the effects of AFM.


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Old 06-21-2013, 07:20 PM   #10
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Quote:
Originally Posted by Sftshldr View Post
True, but while sitting idle at a stop sometimes the engine will drop into 4 cyl mode or under a light load and this can cause some vibration as well as exhaust note / tone changes which with a factory exhaust is not as noticeable. The range device makes the engine stay in 8 cyl mode ... always and does not mess with the factory tune.
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Originally Posted by nyrfan View Post
This is true, I forgot about that. That's the reason the L99 has the flexible cats. OP, you may be feeling the effects of AFM.


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Good point. Didn't think about that. Any further ideas of why all of a sudden my exhaust is popping when I get on it?
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Old 06-21-2013, 07:27 PM   #11
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Good point. Didn't think about that. Any further ideas of why all of a sudden my exhaust is popping when I get on it?
I've read that headers make the exhaust pop more. Can't say for sure, but ill be able to tell you tomorrow as my headers are going in.


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Old 06-21-2013, 07:48 PM   #12
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I've read that headers make the exhaust pop more. Can't say for sure, but ill be able to tell you tomorrow as my headers are going in.


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I guess I'm fine with the popping, but I just thought it was unusual that it just started as opposed to when I put them on 200 miles ago. Definitely scared the crap out of me because i wasn't expecting it. Thought I hit something at first.
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Old 06-21-2013, 07:51 PM   #13
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I guess I'm fine with the popping, but I just thought it was unusual that it just started as opposed to when I put them on 200 miles ago. Definitely scared the crap out of me because i wasn't expecting it. Thought I hit something at first.
Well if you want to avoid tuning but want to get rid of the AFM I am selling my range device for $150 shipped.


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Old 06-21-2013, 07:55 PM   #14
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Well if you want to avoid tuning but want to get rid of the AFM I am selling my range device for $150 shipped.


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Thanks for the offer, but I am planning on tunning it sometime this year. I have stuff going on right now...basement got some water in it, wifes pregnant...yada yada yada. Unfortunately the nearest dyno tuner is about 2 1/2 hours away.
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Old 06-22-2013, 07:04 PM   #15
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UPDATE

Alright, so I took the car out again and I am noticing chugging at a stop and when start to move again it feels sluggish. When I hit about 4,000 RPM I start to get the crackling noise. I also got a Stability Track light too. I am thinking this might have something to do with my spark plugs. Not sure if they are cracked from header install or if they loosened up or if the wire is making connection. Any ideas?
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Old 06-23-2013, 02:53 AM   #16
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NEW UPDATE

Alright, went out to my car to take a look at the plugs and wires. Come to find out that one of the wires isn't even attached to my spark plug. Went ahead and reattached it. I will take it for a short drive tomorrow morning so hopefully all is good now. Not sure if it just wasn't put back on during the install of my headers, or if it wasn't snapped in all the way and it worked itself loose. Im just hoping that it doesn't happen again. Maybe I should just buy a new wire?
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Old 06-23-2013, 02:00 PM   #17
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Quote:
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UPDATE

Alright, so I took the car out again and I am noticing chugging at a stop and when start to move again it feels sluggish. When I hit about 4,000 RPM I start to get the crackling noise. I also got a Stability Track light too. I am thinking this might have something to do with my spark plugs. Not sure if they are cracked from header install or if they loosened up or if the wire is making connection. Any ideas?
rberns,

Thanks for the updated posts. Please let me know if there's anything I can look into for you if this problem persists. You are more than welcome to PM us anytime with your inquiries.

William R.
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Old 06-24-2013, 12:26 PM   #18
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Get a tune already. Your factory tune is a lot further off than you think with your headers. Also replace all your spark plugs. Its cheap insurance to make sure you didn't crack one.

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