My CTS-V engine problem - Team Camaro Tech
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post #1 of 35 (permalink) Old Oct 23rd, 11, 04:56 PM Thread Starter
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Lane
 
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My CTS-V engine problem

Hey guys,

Any thoughts on this would be appreciated....

I noticed today after filling up the car while driving home there was a new unpleasant sound coming from the engine. The best I can describe it is it sounds like a loud ping like detonation but I always run 93 octane. It idles fine with no issues, the sound comes in about 1500 rpms and follows up as it is reved up. No CEL and it seems to be performing as normal.

I've checked and it seems to be coming from the top end so my thought is maybe a bent pushrod or bad lifter... Any thoughts??

*********************************
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383 Stroker\700R4\Vigilante\12 Bolt Eaton Posi 3:55
QA1; Hotchkis; Vintage Air; IROC Steering Box
Owned and operated for over 20 years....................

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post #2 of 35 (permalink) Old Oct 23rd, 11, 08:31 PM
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Dale
 
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Re: My CTS-V engine problem

A chunk of carbon fell into the combustion chamber?
If you haven't run some top engine cleaner through it recently, you may find it takes care of the problem.
93 octane leaves more deposits than low octane.

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post #3 of 35 (permalink) Old Oct 24th, 11, 03:53 AM
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Re: My CTS-V engine problem

Could be water in the gas from the storage tank. I would run the present tankful dry and refuel from another station. Or siphon the gas out and pour into another vehicle or save it for the B&S lawn mower. However, I know its kindda hard stuffing 18 gallons into a 5 gal gas can.

Yes, as Dale suggests, add a can of Heet, white gas, to absorb the water.

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post #4 of 35 (permalink) Old Oct 24th, 11, 08:00 PM Thread Starter
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Re: My CTS-V engine problem

I REALLY hope it's that simple as I really don't feel like opening this thing up...

I will mess with it tomorrow and give an update. Thanks guys very much for you suggestions!

Thanks, Joe

*********************************
69' Camaro X44 Base Coupe - 1\4 - 12.79
383 Stroker\700R4\Vigilante\12 Bolt Eaton Posi 3:55
QA1; Hotchkis; Vintage Air; IROC Steering Box
Owned and operated for over 20 years....................

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post #5 of 35 (permalink) Old Oct 24th, 11, 08:24 PM
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Steiner
 
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Re: My CTS-V engine problem

New tank of gas, new issue, gotta go with that. How many miles on it and when's the last time the fuel filter was changed out?

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post #6 of 35 (permalink) Old Oct 24th, 11, 10:06 PM Thread Starter
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Re: My CTS-V engine problem

Just turned 49K miles... I purchased it in the beginning of the year so not sure about the fuel filter. It really sounds more internal to me and not a good sound but I will certainly start with the simple things first... Keep in mind it idles, runs perfect. No CEL, completly stock. The mystery sound starts about 1600 RPM or so and follows the RPM's.

I'm following another thread as well as he seems to be having the same problem and the sound is very much alike.... Please check it out and let me know what you think...


Thanks again for you suggestions, it is VERY much appreciated.

*********************************
69' Camaro X44 Base Coupe - 1\4 - 12.79
383 Stroker\700R4\Vigilante\12 Bolt Eaton Posi 3:55
QA1; Hotchkis; Vintage Air; IROC Steering Box
Owned and operated for over 20 years....................

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post #7 of 35 (permalink) Old Oct 24th, 11, 11:10 PM
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Steiner
 
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Re: My CTS-V engine problem

Oh, OK I was under the impression it was while driving and under load not also while parked. I hope yours does not sound like the one in the video because that one sounds like wrist pin from my experience and is going to lose a rod at some point. You can isolate whether or not it's a rod knock by pulling the plug wire or power to the coil in your case from each cylinder. It should quiet down a little when the guilty cylinder does not fire. Thing is, carbon build up can also cause a similar sound.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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post #8 of 35 (permalink) Old Oct 25th, 11, 03:40 AM
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Re: My CTS-V engine problem

Heavy knock. As Steiner suggests, wrist pin or rod bearing failure. No fuel filter change is going to fix this sound.
In removing plug wire, you'll have to remove the engine cover to get to the coil(s) as there is one coil per cylinder and unplug the coil from the harness.

Another idea would be to add a can of GM EOS to the crankcase oil and listen whether the noise gets reduced in volume. EOS = Engine Oil Supplement. Old school fix for a knocking rod was to add a can of Wynn's Oil Treatment. Heavy enough the to displace the space of a knocking rod, but coated everything else and took several oil changes to remove from the engine. EOS is not like this, better supplement. Used to break-in camshafts & flat tappet lifters and mixes with the oil.

Further thinking about this symptom, engine running quietly, fill the tank, and problem appears.
Could it have been a leaky injector promoting a hydrostatic condition - bent rod slightly?
Is there a noticable exhaust pulse at the tailpipes? Bent rod would show lesser compression pressure.
Was there any difference in starting the engine after fill-up?

Could be the "Dodge" floormat....................

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post #9 of 35 (permalink) Old Oct 25th, 11, 07:25 AM Thread Starter
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Lane
 
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Re: My CTS-V engine problem

Was there any difference in starting the engine after fill-up?

Now that you mention that, the engine def took longer to start as it spun over longer than usual. I didn't think nothing of it at the time. Is this a symptom of a bent pushrod?

Could be the "Dodge" floormat....................[/QUOTE]

*********************************
69' Camaro X44 Base Coupe - 1\4 - 12.79
383 Stroker\700R4\Vigilante\12 Bolt Eaton Posi 3:55
QA1; Hotchkis; Vintage Air; IROC Steering Box
Owned and operated for over 20 years....................

04' CTS-V - Daily Driver -
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post #10 of 35 (permalink) Old Oct 25th, 11, 08:29 AM
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Re: My CTS-V engine problem

Quote:
Originally Posted by sixtynine View Post
Is this a symptom of a bent pushrod?
Bent piston rod.

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post #11 of 35 (permalink) Old Oct 25th, 11, 03:33 PM Thread Starter
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Re: My CTS-V engine problem

More symptoms:

Running rich, black sut out exhuast... Pulled plugs and have one cylinder not hitting as the plug is covered in sut. Lifter?????

I brought it to two different shops this morning and one told me wrist pin the other told me lifter.....

*********************************
69' Camaro X44 Base Coupe - 1\4 - 12.79
383 Stroker\700R4\Vigilante\12 Bolt Eaton Posi 3:55
QA1; Hotchkis; Vintage Air; IROC Steering Box
Owned and operated for over 20 years....................

04' CTS-V - Daily Driver -
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post #12 of 35 (permalink) Old Oct 25th, 11, 05:19 PM
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Re: My CTS-V engine problem

Bad plug and/or coil pak. Might swap plug then coil pak to see whether synptom follows the parts moved or stayed. Compression check of the one cylinder would be next followed by the other seven.

Hook up remote starter button would be the easiest, unless you want to pull f/pump fuse/power and kill ignition.

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post #13 of 35 (permalink) Old Oct 25th, 11, 08:01 PM Thread Starter
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Re: My CTS-V engine problem

Soooo, is it possible that my only problem is a coil pak or plug.......?

I will put in a new plug and check the coil pak tomorrow night when I get home from work.


Thanks again, Joe
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69' Camaro X44 Base Coupe - 1\4 - 12.79
383 Stroker\700R4\Vigilante\12 Bolt Eaton Posi 3:55
QA1; Hotchkis; Vintage Air; IROC Steering Box
Owned and operated for over 20 years....................

04' CTS-V - Daily Driver -
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Last edited by sixtynine; Oct 25th, 11 at 08:21 PM.
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post #14 of 35 (permalink) Old Oct 25th, 11, 08:54 PM
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Re: My CTS-V engine problem

You can check coil resistance fairly easy.
Primary on pins for black and green wires (if like a fourth gen), around 0.5 ohms
Secondary on spark plug end, around 6000 ohms give or take 1k.

Good luck with it.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'02 Z/28 vert-stock-sold and totaled
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post #15 of 35 (permalink) Old Oct 26th, 11, 04:17 PM Thread Starter
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Lane
 
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Re: My CTS-V engine problem

Well changed plugs, verified coil pack is good.... Started up and sounded perfect, once it warmed up the infamous rattle came back.... Doesn't seem to be as bad but it is still there.. Once it cools down I will do a compression test.

I hope this doesn't turn into "My CTS-V engine build"

*********************************
69' Camaro X44 Base Coupe - 1\4 - 12.79
383 Stroker\700R4\Vigilante\12 Bolt Eaton Posi 3:55
QA1; Hotchkis; Vintage Air; IROC Steering Box
Owned and operated for over 20 years....................

04' CTS-V - Daily Driver -
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