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post #1 of (permalink) Old 12-26-2017 Thread Starter
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07 Chevy impala ss

So I've been having oil consumption and now I have multiple misfires as well as afm or DoD won't activate so stuck in 8 cylinder mode...any experiences or idea?

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8 cylinder mode

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Originally Posted by domination2580 View Post
So I've been having oil consumption and now I have multiple misfires as well as afm or DoD won't activate so stuck in 8 cylinder mode...any experiences or idea?

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Have you checked for any OBD codes? Many will stop the DoD to function. Also, check the oil pressure switch, if it is faulty, only 8 cylinder mode
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Have you checked for any OBD codes? Many will stop the DoD to function. Also, check the oil pressure switch, if it is faulty, only 8 cylinder mode
Yes, p0300. Had mass air flow code, changed that. Cleared them and now just the one p0300

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Yes, p0300. Had mass air flow code, changed that. Cleared them and now just the one p0300

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That is a random misfire code. With burning oil and that code, would suspect head gasket or rings may be the problem. I am however not a mechanic, just do the vast majority of my own repairs. Would lean towards compression check to pinpoint which specific cylinders you are having the issues with.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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That is a random misfire code. With burning oil and that code, would suspect head gasket or rings may be the problem. I am however not a mechanic, just do the vast majority of my own repairs. Would lean towards compression check to pinpoint which specific cylinders you are having the issues with.
Well the plugs are pretty fouled up. Plan is to change plugs and wires and do compression checks while I'm doing that.

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Ok so, an update.....once again more misfire codes, I replaced the valve covers, and plugs, still burns oil. Is there a new oil pan gasket? What would cause my oil to be still dropping?

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post #7 of (permalink) Old 04-18-2019
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Originally Posted by domination2580 View Post
Ok so, an update.....once again more misfire codes, I replaced the valve covers, and plugs, still burns oil. Is there a new oil pan gasket? What would cause my oil to be still dropping?
The LS4 motors have four cylinders which get shut down by the active fuel management system (AFM). I don't understand all the details, but the bottom sides of those four cylinders get sprayed with oil to keep them lubricated while shut down. Apparently, this oiling can result in some of the rings sticking which results in additional oil consumption.

The new gasket controls/reduces the amount of oil sprayed on the cylinders, to prevent the rings from sticking. But it does not unstick the rings. For that, there is a procedure that dealers can run which involves putting solvent in the cylinders to unstick the rings. I think they pour it down the spark plug holes and let it soak the rings for a while. Once the rings are freed, the oil consumption should go down.

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Originally Posted by plano-doug View Post
The LS4 motors have four cylinders which get shut down by the active fuel management system (AFM). I don't understand all the details, but the bottom sides of those four cylinders get sprayed with oil to keep them lubricated while shut down. Apparently, this oiling can result in some of the rings sticking which results in additional oil consumption.



The new gasket controls/reduces the amount of oil sprayed on the cylinders, to prevent the rings from sticking. But it does not unstick the rings. For that, there is a procedure that dealers can run which involves putting solvent in the cylinders to unstick the rings. I think they pour it down the spark plug holes and let it soak the rings for a while. Once the rings are freed, the oil consumption should go down.



HTH.



Doug



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I wonder if I absolutely need to do that procedure for cleaning the rings.... or if I can just do the oil pan gasket?

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And also, would u happen to have that part number for the new oil pan gasket?

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I wonder if I absolutely need to do that procedure for cleaning the rings.... or if I can just do the oil pan gasket?
Like I said, the gasket won't unstick the rings. The oil consumption problem will still be there.

That said, the soaking procedure is easier than the gasket swap. Removing the oil pan is a pain. Removing plugs and pouring solvent isn't very hard. The key to that is knowing all the steps in the procedure. Does the piston need to be at TDC? What kind of solvent? How much? How long to soak? How to drain and re-fill/re-lube the engine to prevent damage? If you can figure out how to do all that, then go for it. For me, it was worth a few hundred dollars to let a pro do it.

HTH.

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And also, would u happen to have that part number for the new oil pan gasket?
Here's the GM p/n I found: 12643081 .

There's a bulletin regarding this, 11-06-01-007, but I can't find a pdf of it. It gives more details of the procedure.

If I find any more info, I'll post back later.

HTH.

Doug

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Re: TSB 11-06-01-007

See post #3 in this thread: https://www.impalaforums.com/chevy-i...ion-08-ss.html

Doug

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If your socket set is all the same brand, you might be a city slicker.

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Last edited by plano-doug; 04-18-2019 at 06:50 AM.
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