Knocking noise during acceleration and deceleration - Team Camaro Tech
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post #1 of 19 (permalink) Old Sep 3rd, 10, 08:54 AM Thread Starter
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Giorgio
 
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Knocking noise during acceleration and deceleration

I need some help . my 1968 Camaro automatic with TH400 and 10 bolt rear end makes a hard knocking noise during acceleration and deceleration.

The noise gets harder when car is driven more than half an hour.

Also during shifting without car movement you can hear the noise .

This are the parts I have already changed :

The automatic transmission was rebuild 450 miles ago

Drive shaft front and rear joints are changed.

10 bolt rear end Spider gears are changed and the differential play was adjusted.

And at least ( yesterday) the transmission flange of the TH400 was changed because it has some play.

But the knocking noise is still there first quiet and gets louder as the car is driven longer .

I don't know what else to change or to look for , has anybody some ideas or had the same problem?

The guy who overhauled the automatic is comming on Monday to have a look , but he told me on the phone that the TH400 is in perfect shape after the overhaul and that is not the cause of the noise.
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post #2 of 19 (permalink) Old Sep 3rd, 10, 03:00 PM
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Re: Knocking noise during acceleration and deceleration

Suerly you can tell if in the rear or trans????

I would suspect wrong oil in the diff or aditives not added.

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post #3 of 19 (permalink) Old Sep 3rd, 10, 03:20 PM
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Re: Knocking noise during acceleration and deceleration

Rod Bearing, if it gets louder under engine braking.

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post #4 of 19 (permalink) Old Sep 4th, 10, 02:57 AM Thread Starter
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Re: Knocking noise during acceleration and deceleration

The diff oil was changed after spider gear change and it was filled up with the right one.

Engine braking noise?During engine braking there is no noise!
The Noise is only a short knock when pushing the gas pedal or lift off the gas pedal.

I can not really locate the knocking , first I thought it came from the joints of the drive shaft, but they are now both changed.
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post #5 of 19 (permalink) Old Sep 4th, 10, 11:46 AM
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Re: Knocking noise during acceleration and deceleration

Don't forget to check that a converter to flywheel bolt did not come loose and back out a few threads. They first rub some making a clunking noise the turn to a nasty knocking as they chew the starter noise! I actually found aluminum shavings under my car in the garage due to this!
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post #6 of 19 (permalink) Old Sep 4th, 10, 01:16 PM
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Re: Knocking noise during acceleration and deceleration

That knock you cant find? but its up front right?
Really hate when it cant be found...to often its a collasped or cracked piston.
With the car up on a hoist is it loader? from the engine?

Get a mechanics stethosope..they are cheap and a must for the tool box, then listen around and isolate
Cracked and collaped piston are notorious to sort of harmonic around in the engine making impossible to locate without a stethoscope.

Locate the sound, till then everything is just a huge list of speculation.

Hell it could just end up being detonation

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Last edited by Steptoe; Sep 4th, 10 at 02:29 PM.
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post #7 of 19 (permalink) Old Sep 4th, 10, 01:32 PM
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Re: Knocking noise during acceleration and deceleration

Check the cearance between the starter gear and flywheel also. Mine was making an odd noise and sounded like it was comming from the lower end and thats what it turned out to be.

I ended up having to clearance the starter gear slightly to gain enough clearance. The flex plate lived up to it name flexing just enough under accelleration to make contact.

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post #8 of 19 (permalink) Old Sep 5th, 10, 03:17 PM
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Re: Knocking noise during acceleration and deceleration

An Exhaust Header Gasket can sound like a TIC similar to a Valve Train issue but you say a "Knock" and it does not do it under Engine Braking. That's a Good Sign which indicates the Bearings are probably OK. I would Check for Cracked Flex Plate - Fuel Pump Push Rod issue, which can include the Pump Eccentric Lobe worn on cam. If All Check OK then do a Leak Down Test which can identify Piston Skirt Damage. Another possibly is Wrist Pin. Also check Crankshaft end play for Thrust Bearing Wear.

Check for Metal in the Oil.

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Last edited by Z15CAM; Sep 5th, 10 at 03:29 PM.
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post #9 of 19 (permalink) Old Sep 8th, 10, 04:50 PM
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Re: Knocking noise during acceleration and deceleration

First thing I'd check are the torque convertor bolts - especially since you just had the tranny rebuilt. I'd bet they're loose.

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post #10 of 19 (permalink) Old Sep 9th, 10, 08:41 AM
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Re: Knocking noise during acceleration and deceleration

Does it sound anything like this: Listen for the faint "clunk"...
http://www.mattlekawa.com/pictures/c...trnasClunk.wmv

Matt

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post #11 of 19 (permalink) Old Sep 9th, 10, 02:03 PM
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Re: Knocking noise during acceleration and deceleration

He hasnt been back for update in the last 5 days...

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post #12 of 19 (permalink) Old Sep 9th, 10, 10:56 PM Thread Starter
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Re: Knocking noise during acceleration and deceleration

The automatic gear is removed and I wait for the answer of the gear overhaul guy.

So if I got any more informations I will post them and I can't check anything because the automatic gear is removed.

Thanks for all your help .
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post #13 of 19 (permalink) Old Sep 11th, 10, 02:58 AM Thread Starter
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Giorgio
 
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Re: Knocking noise during acceleration and deceleration

I've taken a film of the knocking noise, it is taken from the rear because you can hear it better without the engine noise.

Engine is running the gear handle is changing from N to R and D.

Here the noise :http://img689.imageshack.us/img689/3610/mov07305.mp4
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post #14 of 19 (permalink) Old Sep 11th, 10, 10:02 AM
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Re: Knocking noise during acceleration and deceleration

DUDE! Your driveshaft shifts in the video! thats with the car in park?! make sure ur driveshaft is secure! that looked almost like a death sentence man! filming that car underneith while its running, the thing looks like the torque converter might engage. u better chec ur spindle the shaft slides onto. also that torque converter may be shot! good luck man

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post #15 of 19 (permalink) Old Sep 12th, 10, 02:45 AM Thread Starter
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Re: Knocking noise during acceleration and deceleration

The Parkbrake was set and a friend of mine shifted the automatic gear.
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