Door window knocks/clunks when lowered - Fourth Generation Pontiac Firebird (1993 - 2002) - Firebird Nation

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Door window knocks/clunks when lowered


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#1 lmoore32

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Posted 12 May 2020 - 01:04 AM

I replaced both window motors, but the passenger side clunks repeatedly, ONLY while being lowered. It's smooth and quiet going up.

Sounds like it's hitting something near the front half, but I can't see where it's happening.

Might it be a regulator issue?

NOTE: As the old motor slowly died out, there was no noisy descent, only after my replaced motor. So I suspect something got moved into the path, but that doesn't fully explain the smooth ascent.

Thoughts, theories, strategies?
Thanks guys!!!

#2 sea dog

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Posted 12 May 2020 - 03:57 AM

I'd say, take the door panel back off and observe what's going on as window is lowered from closed to fully open. 

 

Usually when you replace the window motors, you replace the rivets with screws & bolts. When I did my 95 years ago, I cheaped out and used whatever bolts I had on hand. One of them was just a touch too long. Every time window went down it would hit the too long bolt.



#3 GaryDoug

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Posted 12 May 2020 - 07:09 AM

Re-grease the tracks


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#4 lmoore32

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Posted 12 May 2020 - 03:44 PM

My panel is still off, and I'm going to examine it again when the rain lets up Thursday. I used the new bolts and screws that came with motor, they're the same size just brand new.

I did lube both sides a couple of times, but this isn't an in track/regulator sound or mere squeaking.

It's either hitting something, or the regulator is giving out.


Just wanted to see if anyone experienced this. I'll 'CAREFULLY' check it out with small mirror, and document it for posterity. Thanks guys.

#5 GaryDoug

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Posted 12 May 2020 - 09:36 PM

My panel is still off, and I'm going to examine it again when the rain lets up Thursday. I used the new bolts and screws that came with motor, they're the same size just brand new.

I did lube both sides a couple of times, but this isn't an in track/regulator sound or mere squeaking.

It's either hitting something, or the regulator is giving out.


Just wanted to see if anyone experienced this. I'll 'CAREFULLY' check it out with small mirror, and document it for posterity. Thanks guys.

 

You may have installed the bolts with the heads inside of the window instead of outside . The bolts may be projecting out too much inside.


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#6 Fitch

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Posted 13 May 2020 - 10:17 AM

Mine do the same thing after installing new Dorman motors. I assumed it was worn regulators. They rumble going up and down  like the teeth are not meshing well.



#7 lmoore32

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Posted 15 May 2020 - 01:09 AM

Gary - "You may have installed the bolts with the heads inside of the window instead of outside . The bolts may be projecting out too much inside."

That's a good guess Gary, I did screw the bolts in. However, this happens as soon as it begins to descend, long before anything reaches the motor area. Also I did the driver's side the same way and it's fine.

----

Fitch - "Mine do the same thing after installing new Dorman motors. I assumed it was worn regulators. They rumble going up and down like the teeth are not meshing well."

It is a creeching rumble, and I considered that Fitch. But it only has difficulty going down, up is smooth as silk.

I noticed the window was also loose in the half down position. It may be leaning inward or outward while going down, and just require tightening.

Thanks for the input guys, if you have another suggestions, I'm open to them. I plan to get back out there Fri and/or Sat, and will keep you posted.

#8 Injuneer

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Posted 15 May 2020 - 06:39 AM

A general guide to 4th Gen window adjustment:

 

http://shbox.com/1/adj_window.html

 

 

Shoebox also has a motor replacement guide that you may already have found, since you have completed the replacement:

 

http://shbox.com/page/windowmotor.html


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#9 lmoore32

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Posted 16 May 2020 - 01:08 AM

I kept hoping it wasn't, but I did research on the sound and it's the regulator guys.

4 Symptoms of a Bad Window Regulator (and Replacement Cost)


3) Strange Noises
If the window is able to move and you hear strange noises, this could be an early warning sign of a failing regulator. The noises may sound like grinding, clicking, or chattering.

https://oards.com/po...regulator-info/

Thanks for your insights.




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