LS6 Shut-Down Stumble Question - Cadillac V-Series - CTS-V, STS-V and XLR-V
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post #1 of 9 (permalink) Old 08-28-2006, 12:24 AM Thread Starter
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LS6 Shut-Down Stumble Question

Hi,

I just picked up an 04 CTS-V.
It's such a joy to drive and handles way better than I expected.
However, I noticed there is a slight stubmble when shutting the engine down.
Is this normal?
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post #2 of 9 (permalink) Old 08-28-2006, 08:54 AM
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What do you mean? How about a little more detail. Is it like pinging?
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post #3 of 9 (permalink) Old 08-28-2006, 05:00 PM Thread Starter
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What do you mean? How about a little more detail. Is it like pinging?
After turning the ignition off, the engine continues spinning for about a second or two longer than I would expect. Then it comes to rest with a bit of a shake and slight rattle. The brief rattle does sound similar to a pinging sound.
Is that normal behavior for this engine?

Last edited by LunarX; 08-28-2006 at 05:04 PM.
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post #4 of 9 (permalink) Old 08-29-2006, 06:31 AM
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Both the LS6 in the V and the LS1 in the Corvette do this. At first I thought it sounded a bit weird when shutting down but I eventually got used to it. If you still suspect something is wrong post up a sound clip or a video. I highly doubt your engine is pinging when it is shutting down.




2005 CTS-V - repurchased by GM as a lemon
2006 Corvette Coupe
1999 Corvette Fixed Roof Coupe
http://www.thend.org/~mkane/Corvette/

Install a wide band oxygen sensor in place of a stock sensor:
http://www.thend.org/~mkane/Corvette/wbo2.html

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Notice: Vehicle component durability is greatly influenced by these driver abuses. Driving in this manner is not recommended.
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post #5 of 9 (permalink) Old 08-29-2006, 06:54 AM Thread Starter
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Thanks for the info.
I really appreciate the quick response.
My car only has 9K on it, so I suspected all was well.
I feel a lot better now.

BTW - This forum rocks!
I really appreciate the demeanor of people who post here.
It's so much nicer than the situation on other automotive forums, that get so ridiculous sometimes.
You guys have something really great going on here.

04 CTS-V: Stock
04 WRX Wagon: Modded Like Crazy
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post #6 of 9 (permalink) Old 08-29-2006, 02:46 PM
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Quote:
Originally Posted by LunarX
Thanks for the info.
I really appreciate the quick response.
My car only has 9K on it, so I suspected all was well.
I feel a lot better now.

BTW - This forum rocks!
I really appreciate the demeanor of people who post here.
It's so much nicer than the situation on other automotive forums, that get so ridiculous sometimes.
You guys have something really great going on here.
Tell your friends, we need more people!




2005 CTS-V - repurchased by GM as a lemon
2006 Corvette Coupe
1999 Corvette Fixed Roof Coupe
http://www.thend.org/~mkane/Corvette/

Install a wide band oxygen sensor in place of a stock sensor:
http://www.thend.org/~mkane/Corvette/wbo2.html

Quote:
Originally Posted by TSB1684809
Notice: Vehicle component durability is greatly influenced by these driver abuses. Driving in this manner is not recommended.
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post #7 of 9 (permalink) Old 08-30-2006, 02:27 PM
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Tell your friends, we need more people!
I'm trying
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post #8 of 9 (permalink) Old 09-02-2006, 10:21 AM
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I bet one or both of your motor mounts are broken... The mount doesn't break completely but it cracks enough to leak fluid out of it. Once it does that it almost feels like the engine is "running on" or "dieseling" when you shut the car off... Seen quite a few V's with this condition...
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post #9 of 9 (permalink) Old 09-02-2006, 10:25 AM Thread Starter
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Thanks Redline.

That's probably it.
I'll have it checked out and post the findings.

04 CTS-V: Stock
04 WRX Wagon: Modded Like Crazy
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