LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Weird rattle when I shut off the car

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Old Jun 9, 2005 | 09:30 PM
  #1  
Gripenfelter's Avatar
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Weird rattle when I shut off the car

Car seems down on power a bit.

It rattles sometimes when I shut it off. Idle seems a bit low.

If I'm driving and I let off the gas, it doesn't matter how fast I'm going, the rpms will drop to 1000 rpm.
Old Jun 9, 2005 | 11:15 PM
  #2  
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Re: Weird rattle when I shut off the car

It also seems to idle low and almost stall sometimes.

Header leak?

Something more serious?
Old Jun 9, 2005 | 11:20 PM
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Re: Weird rattle when I shut off the car

If you have a 6 spd its probably the clutch TO bearing.. mine will rattle if I dont hold down the clutch when I shut it off.
Old Jun 9, 2005 | 11:33 PM
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Re: Weird rattle when I shut off the car

Nope. Its an auto.
Old Jun 10, 2005 | 01:17 AM
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Re: Weird rattle when I shut off the car

i had my torque converter bolts back off the flexplate, that thing made a horrible racket whenever there was slack enough for the converter to vibrate like at idle or when the car was turned off.
Old Jun 10, 2005 | 09:44 AM
  #6  
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Re: Weird rattle when I shut off the car

Originally Posted by Evil Eric
i had my torque converter bolts back off the flexplate, that thing made a horrible racket whenever there was slack enough for the converter to vibrate like at idle or when the car was turned off.
Sounds about right. I'll check tonight. Thanx.

Anyone have any ideas about why the rpms drop so fast when I let off the gas?
Old Jun 10, 2005 | 10:02 AM
  #7  
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Re: Weird rattle when I shut off the car

Is your transmission slipping?

- Z28wannaB
Old Jun 10, 2005 | 10:07 AM
  #8  
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Re: Weird rattle when I shut off the car

Doesn't feel like it.

Car just drops down very fast to 900 rpm as if it was stalling but doesn't. Sounds weird driving at 45mph with the car idling and hearing the cam lope.
Old Jun 12, 2005 | 11:19 AM
  #9  
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Re: Weird rattle when I shut off the car

Turned out that the torque converter bolts had backed out.
Old Jun 12, 2005 | 03:51 PM
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Re: Weird rattle when I shut off the car

Glad you found the problem... last item I had a rattle like that my Floor pan ended up flying off in the middle of a race after I hit my Nos button.
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