Single Cylinder Misfire - intake valve spring - Page 3 - Chevy HHR Network


2.2L Performance Tech 16 valve 143 hp EcoTec with 150 lb-ft of torque

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Old 02-12-2018, 01:59 PM   #21  
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Okay, as I read your description, you did NOT remove the spark plugs?

The point was to get the SeaFoam onto the rings in force. I guess I should have been more precise I.E.: remove the plugs, then pour SeaFoam into the spark plug hole attempting to saturate the piston rings.
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Old 02-12-2018, 07:25 PM   #22  
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After one day's driving, the P0303 was still reported when in low speed, especially during idling. Other than swapping and/or rebuilding the engine, is there any cheap way that I could try?
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Old 02-12-2018, 07:29 PM   #23  
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Yes, I did remove all the 4 spark plugs first and added the seafoam into the 4 wells. I could see the seafoam covering the piston top (black). When I checked in the middle night, the seafoam was still covering the tops. After the whole night, all seafoam were soaked.
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Old 02-13-2018, 08:28 AM   #24  
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I put the seafoam to the #3 well again last night. I could feel the engine run smoother than before. But in terms of the misfire P0303, nothing changed.
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Old 02-13-2018, 08:52 AM   #25  
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Do the compression again just for kicks. It was a long shot.

Your terminology is what is confusing me. The depression in the valve cover that the plugs go down is a well; the area that the piston lives is a cylinder; to me anyway.
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Old 02-13-2018, 09:36 AM   #26  
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So are you putting the Seafoam in the spark plug we’ll with the plug installed or down into the combustion chamber with the spark plug removed, just to verify
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Old 02-13-2018, 08:53 PM   #27  
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Sorry for confusing you with the wrong terms. My bad. Here is the process I did:

1) Removed all the spark plugs
2) Compression test
3) Put the Seaform into the spark plug holes, it went all the way down where I could see some carbons at the "bottom" of the hole. I stopped until the Seafoam fluid covered the bottom.
4) Waited for the whole night, rechecked each spark plug hole and didn't see any Seafoam fluid.
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Old 02-13-2018, 08:59 PM   #28  
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I retested the compression again. One or two strokes brought the pressure measurement of #1, 2 and 4 to 180 psi. Four strokes brought it up to 210 psi. For the #3, One or two strokes brought the pressure measurement to 115 psi. Four strokes - 125 psi.

I added engine oil to #3 again. Then four strokes brought it up to 150 psi. No big jump as before. But it is still much lower than other three.
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Old 02-13-2018, 09:14 PM   #29  
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I am wondering if this could be some carbon deposits on the intake valve of #3. I noticed my throttle body and even the intake air pipe connecting to the throttle body had a oil/fuel like black layer. Is it possible the intake valve of #3 couldn't seal the cylinder well due to the deposit on it?
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Old 02-13-2018, 09:21 PM   #30  
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Over 200 PSI, if your tester is accurate, might indicate heavy carbon deposits in the combustion chamber. I mean a lot, it might take many, many seafoam treatments to clean it up.

I would try a different tester, auto parts stores have them in their loaner program.

But, yes there does seem to be a problem with #3 that the seafoam might be able to help with.
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