knocking noise? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-30-2006, 06:41 PM   #1
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Default knocking noise?

ok so when i stop put the car in park and shut the engine off i keep hearing this knocking noise sounding like someones in the trunk trying to get out? it happens like once a min for a few minutes. any ideas? thanks
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Old 04-30-2006, 06:54 PM   #2
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It'* Garb. Let him out.




I get something kinda similar, but when I start the car. I have no idea what it is. I know it'* not the power antenna.
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Old 04-30-2006, 08:46 PM   #3
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Bet it is on his, though. After two replacements on my power antenna, I gave up and bought the manual one at the dealer. $28, better reception.

Unplug it and see if it goes away. Bet it does.
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Old 05-05-2006, 04:45 PM   #4
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the antenna is up and dosent go down? theres no one lockd in the truck, any other ideas?
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Old 05-05-2006, 05:18 PM   #5
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Quote:
Originally Posted by johnvanveen
the antenna is up and dosent go down? theres no one lockd in the truck, any other ideas?
The noise you hear if the antenna is up and won't retract is the antenna motor trying to retract the mast.

Just unplug the damned thing and see if it goes away. It'* right underneath the antenna mast inside the trunk.

It will.
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Old 05-05-2006, 05:19 PM   #6
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Quote:
Originally Posted by johnvanveen
the antenna is up and dosent go down? theres no one lockd in the truck, any other ideas?
Has it been unplugged? Even if it is stuck up, the motor is likely still trying to put it up when you start, and down when you stop.
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Old 05-05-2006, 05:22 PM   #7
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Quote:
Originally Posted by Archon
Quote:
Originally Posted by johnvanveen
the antenna is up and dosent go down? theres no one lockd in the truck, any other ideas?
Has it been unplugged? Even if it is stuck up, the motor is likely still trying to put it up when you start, and down when you stop.
No it won't. The plug includes the power source for the antenna motor.
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Old 05-05-2006, 09:25 PM   #8
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Quote:
Originally Posted by Bob Dillon
Quote:
Originally Posted by Archon
Quote:
Originally Posted by johnvanveen
the antenna is up and dosent go down? theres no one lockd in the truck, any other ideas?
Has it been unplugged? Even if it is stuck up, the motor is likely still trying to put it up when you start, and down when you stop.
No it won't. The plug includes the power source for the antenna motor.
I should have worded that more clearly. If it is NOT unplugged, it will still try to raise and lower the antenna
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Old 05-05-2006, 09:40 PM   #9
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Quote:
I should have worded that more clearly. If it is NOT unplugged, it will still try to raise and lower the antenna
Yes, and it will make exactly the sound he described as the mast motor hits the stop for up and down each time.

As I said above, the power antenna isn't worth a plugged nickel. I've been through one, and when the second one failed, just bought the manual one and installed it in 10 minutes.

$28 retail at the dealer, better reception.

It wasn't a hard decision.
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Old 05-05-2006, 10:02 PM   #10
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Quote:
Originally Posted by Bob Dillon
Quote:
I should have worded that more clearly. If it is NOT unplugged, it will still try to raise and lower the antenna
Yes, and it will make exactly the sound he described as the mast motor hits the stop for up and down each time.

As I said above, the power antenna isn't worth a plugged nickel. I've been through one, and when the second one failed, just bought the manual one and installed it in 10 minutes.

$28 retail at the dealer, better reception.

It wasn't a hard decision.
For the '93 I bought one from JC Whitney but it required rewiring to have it work. I agree, the quick, easy and reliable long term fix is the standard antenna.
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