2007 Mazda 3 • 58,000 miles

Hi, I recently changed my oil and decided to clean the intake manifold and throttle body and when I looked inside the manifold there was a thick oily layer. This explains why the oil level was low also. I researched online and found it could be a clogged PCV valve so I changed it which included removing the intake manifold so I cleaned it out while it was removed. I installed everything and went to drive it and now during acceleration it is sluggish until 5000 rpms and then it really pulls. Any ideas on what this could be, could it be that some of the carb cleaner got into the combustion chamber and damaged the plugs. There is also some of the oily film in the combustion chamber on top of the pistons. Thanks for the help!
December 29, 2012.

Oil film is normal in the upper intake. It is from blow by in the pistons.

Make sure you have no vacuum leaks from your repair.


Dec 30, 2012.
Thank you for the quick reply. I also went ahead and changed the spark plugs and when I looked inside there the cylinder there was more black stuff on the pistons. I recentlly drove after changing the oil and the oil level dropped to the bottom of the stick after only 200 miles. There is no oil leak anywhere though and it doesn't smell at all like burning oil out of the exhaust. Here is a picture of the old spark plugs and down into the clyinder. Do you have any idea as to what this could be? Thank you.

Jan 3, 2013.