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Hi all, wanted to see if any of y'all might have some prior experience in vacuum leaks with your C5 Z06s. Was getting some pretty bad misfiring and code P0300. I believe I have a faulty MAF regardless due to readings I was pulling from scanner, but figured I need to address what appear to be three vacuum leaks. The first two seem to be pretty apparent to me, but the one in the rear of the engine I’m not too sure about. Tried to poke around some but did not see any noticeable vacuum lines back there unless I’m completely missing them. Any help or advice is appreciated!
What readings from your scan tool makes you think you have a bad MAF sensor ??…if your fuel trims are elevated but decrease as you raise the RPM that is how you know you have a vacuum leak…there is a vacuum line at the back of the intake manifold if you didn’t know that.
As you can see the engine should hold the air kind of like a balloon. Any significant leak will be pretty obvious and if you do this in a quiet place it will be easy to hear.
You should consider a wideband O2 for performance applications.
If this is simply a driver mostly original consider spending time at least cleaning, washing, and maintenance for the engine. I recommend a few compression testers and testing to identify balance and engine health checkpoints.
Pinpointing Vacuum Leaks?
