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Old 10-25-2009, 03:22 PM   #1
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intake manifold knocking???

so i took my 06 gto to the track on friday for the first time ever. the car ran great but the next morning i was giving my buddy a jump cuz his battery died and i noticed a knocking noise comming from my intake manifold. i shut down the car and looked thru my t/b and didnt see any thing inside so im asuming that its comming from one of the chambers up top. it gets more progressive with with more gas too. i know its comming from the manifold because i can feel something hitting the top of it while the car is ideling. any one have any idea what could be causing this?
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Old 10-25-2009, 03:38 PM   #2
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I would say a bearing is spun and a rod is knocking. Rebuild time...
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Old 10-25-2009, 03:45 PM   #3
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would you be able to feel that thru the intake manifold though? the car only has 36000 miles on it and a full exhaust and cold air intake with a tune from superchips hand held tuner.
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Old 10-25-2009, 03:47 PM   #4
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There are no moving parts inside your intake manifold, I say spun bearing as well.
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Old 10-25-2009, 03:56 PM   #5
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so what all is a rebuild going to entail? and what bearing would be spun? i know a little bit about cars just havent had to troubleshoot a problem like this befor.

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Old 10-25-2009, 03:59 PM   #6
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Old 10-25-2009, 04:33 PM   #7
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so what all would go in to this rebuild that i need?
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Old 10-25-2009, 04:38 PM   #8
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Old 10-25-2009, 04:38 PM   #9
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Do you hear it with the hood closed. Is in a solid Knocking sound, or more of a ticking? It is common for the valve train on these cars to sound like a sewing machine. Mine makes an audible ticking sound, and it sounds like it is coming from the intake when the car is running with the hood open. Have you noticed it being down on power or anything strange? Also, the injectors are mounted in the intake, and can make a ticking noise.
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Old 10-25-2009, 04:46 PM   #10
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and when u rev it does the noise inscrease aswell?
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Old 10-25-2009, 04:46 PM   #11
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Quote:
Originally Posted by LS2goatkid...View Post
so i took my 06 gto to the track on friday for the first time ever. the car ran great but the next morning i was giving my buddy a jump cuz his battery died and i noticed a knocking noise comming from my intake manifold. i shut down the car and looked thru my t/b and didnt see any thing inside so im asuming that its comming from one of the chambers up top. it gets more progressive with with more gas too. i know its comming from the manifold because i can feel something hitting the top of it while the car is ideling. any one have any idea what could be causing this?

Does sound like a rod bearing. Your intake manifold is hollow and it will act like a echo chamber for internal noises
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Old 10-25-2009, 04:55 PM   #12
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well i can only hear it with the hood open. it sounds like a knocking and i can feel it on the front 2 chambers of the manifold. it feels normal on power but i havent really gotten on it since friday. and yes when i rev it the noise speeds up.
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Old 10-25-2009, 05:07 PM   #13
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i had the same sound ur talking about and it was indeed a spun rod bearing. i had 15k miles. as stated above pull the valve covers check for little stuff first then time to pull the motor and either rebuild or buy a new shortblock.
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Old 10-26-2009, 06:25 AM   #14
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This may sound retarded but if anything gets trapped under the intake or a valley bolt backs out it will knock like a rod.
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Old 10-26-2009, 06:50 AM   #15
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I've owned two goats and both make a little tick tick sound that I've never been able to run down. sounds like valve train noise. but damn, if yours has started knocking and you can hear and feel it in the manifold, that's not normal.
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Old 10-26-2009, 06:57 AM   #16
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Maybe a bent or broken pushrod. Did you over rev or mis-shift the car at the track?
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Old 10-26-2009, 06:58 AM   #17
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My buddy has the same issue. after ripping his heads off we found a collapsed lifter and a bad push rod. if you have basic mechanic skills. pull the valve cover off then the rockers and check your push rods, then go from there. the lifter that was collapsed left all kinds of ware on the push rod.
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Old 10-26-2009, 12:19 PM   #18
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Quote:
Originally Posted by Nmbr1GMfan...View Post
This may sound retarded but if anything gets trapped under the intake or a valley bolt backs out it will knock like a rod.

thats what i am thinking. because its a definitive feeling when you put your hand on the manifold. the only thing is that it gets progressivly faster with more throttle. im going to pull the valve covers off and i will get back with everyone and let you know what i come up with.
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Old 10-26-2009, 12:23 PM   #19
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it is deffinatly making a knocking noise. it isnt a ticking. its much louder and it sounds like its comming from the top end. i crawled under the car cuz i figured that if it was a bearing i would be able to hear it better from under it but that wasnt the case.
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Old 10-27-2009, 07:47 AM   #20
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got a stethoscope ? Or, put your ear to a long screwdriver.

I'd guess collapsed lifter, bent pushrod. Easy to check. I'd start at the loudest point.

These aluminum block & head, with a plastic manifold make noises travel. I had a noise I'd swear was a roller rocker but ended up being a lifter. Noise travelling all the way up.
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Old 10-27-2009, 08:09 AM   #21
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I love how people just assume spun rod bearing in every situation. Bottom line is if his car is basically stock, he takes care of it (regular oil changes, checks oil level), the odds of a spun rod bearing after 36k are low. Its probably something up top like a lifter or pushrod as stated by a couple of members. I would take a video and post it as well.
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Old 10-27-2009, 08:28 AM   #22
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Originally Posted by mchicia1...View Post
I love how people just assume spun rod bearing in every situation. Bottom line is if his car is basically stock, he takes care of it (regular oil changes, checks oil level), the odds of a spun rod bearing after 36k are low. Its probably something up top like a lifter or pushrod as stated by a couple of members. I would take a video and post it as well.


There's also unknowns, too. Was he low on oil ? Did he add 1 quart ? I do, at the track. Did he bounce it off the limiter, miss a shift ?
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Old 10-27-2009, 04:26 PM   #23
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I had this problem after installing a ported intake, i made the mistake for lack of a better word and reused the old gaskets which were only 38000 miles old, i dont know if one got pinched on the plastic lip when i torqued the intake down or what happen but one of the gaskets ripped in half and air was shooting through the gap making a solid knocking or ticking noise comming from the intake valley, i too figured it was time for a rebuild but i decided to pull the intake first because that was the last thing i had off and discovered the bad intake gasket. Replaced all the gaskets and there was the problem.
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Old 10-27-2009, 04:31 PM   #24
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Also, after 14000 miles on pacesetter headers my header gasket on the passenger side went bad and i was knocking horribly not making a hiss as they usually do, i figured the motor was shot and parked it, a few days later i was getting ready to disasemble and restarted the engine to check things out, after moving all around the car and using a long screwdriver to my ear the only thing i found was it was comming from the passenger side rear cylinder, for some reason i decided to stick my hand back there and it instantly nearly burned my finger. I shut the engine off and let it cool for about 30 minutes, started it up and put my hand back there and found that the header gasked was blow out in the back and the air was shooting out the hole in the gasket making a knock, not a hiss, or a tick. This may sound stupid but i had a mechanic look at it briefly before i parked it and he too said time for a rebuild. Ive never heard a sound like that come from a bad header gasket, but if it cracks or blows out a certian way air can make funny noises when being shot out of the engine that fast. Just another thing to check before you start tearing into things only to find nothing.
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Old 10-27-2009, 05:04 PM   #25
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Quote:
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I had this problem after installing a ported intake, i made the mistake for lack of a better word and reused the old gaskets which were only 38000 miles old, i dont know if one got pinched on the plastic lip when i torqued the intake down or what happen but one of the gaskets ripped in half and air was shooting through the gap making a solid knocking or ticking noise comming from the intake valley, i too figured it was time for a rebuild but i decided to pull the intake first because that was the last thing i had off and discovered the bad intake gasket. Replaced all the gaskets and there was the problem.

how loud was it? im just wondering bc i think i had a very similar problem to the op and my knock was very loud and increased with revs. i checked everything and pulled the heads and there was wonderful debris in the oil and everything it was a joy.
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Old 01-19-2010, 11:59 AM   #26
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I have a tick as well that is similiar in every way except that it goes away apon increasing revs above 2500k. Sounds like its coming from the passenger side (cyl 6 or 8)
I pulled the heads and had them pressure tested. I also checked the push rods, springs, valves, piston faces, rockers, and replaced the lifters with new Ls7's. Cleaned and inspected my cometic gaskets. Sprayed them with copper coat, and buttoned everything back up. At initial start up there is no ticking. But once the car reaches operation temp and i rev it... theres the tick. If i continue to rev it, eventually the tick becomes consistant without reving. . I've also diconnected each coil pack (unloading each cylinder) to see if the noise will go away of get quieter. Nothing changed.

THought!? Could this be an exhaust leak
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Old 01-19-2010, 12:02 PM   #27
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I have a tick as well that is similiar in every way except that it goes away apon increasing revs above 2500k. Sounds like its coming from the passenger side (cyl 6 or 8)
I pulled the heads and had them pressure tested. I also checked the push rods, springs, valves, piston faces, rockers, and replaced the lifters with new Ls7's. Cleaned and inspected my cometic gaskets. Sprayed them with copper coat, and buttoned everything back up. At initial start up there is no ticking. But once the car reaches operation temp and i rev it... theres the tick. If i continue to rev it, eventually the tick becomes consistant without reving. . I've also diconnected each coil pack (unloading each cylinder) to see if the noise will go away of get quieter. Nothing changed.

THought!? Could this be an exhaust leak

Spark plugs tight?
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Old 01-19-2010, 12:31 PM   #28
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Spark plugs tight?

I usually get spark plugs hand tight, and then a half turn with a socket... pretty sure their good. Honestly, I really just need to rule out short block issues. If i have to buy new header gaskets thats a way cheaper fix. Do exhaust leaks generally get quiet when reving past a certain rpm?
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Old 01-19-2010, 12:41 PM   #29
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What the outcome from the original poster?
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Old 01-19-2010, 01:19 PM   #30
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I usually get spark plugs hand tight, and then a half turn with a socket... pretty sure their good. Honestly, I really just need to rule out short block issues. If i have to buy new header gaskets thats a way cheaper fix. Do exhaust leaks generally get quiet when reving past a certain rpm?

No that's why I said plugs.

I had a noise swore it was smurfin internal, would start when warm, tick from idle to like 3k then go away, it was my 7 hole plug was loose.
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