So what did you decide? You've got plenty of ideas thrown your way.

 

im getting a 2nd opinion next wednesday. Id like to try and throw new o2 sensors on there before then but they are like 110 bucks for two not including tax.

 

Spartan- why are you so set on replacing the 02 sensors? It seems like you get an idea in your head then you try and convince yourself it is causing all of your problems. I wouldnt go throwing parts at it in order to solve the problems you are having. Even if an 02 sensor was bad (and still not throwing a code) it might cause some of your driveability issues but wouldnt explain your knock\tick- which is pretty loud. You should be able to find a shop that will look at it immediatly, but whatever works for ya....

 

^ Don't even bother with him, the guy is a total lost cause.

 

jd... seriously with all due respectscrew off bro... Would o2 sensors not cause rough idle or acceleration hesitation and poor gas mileage?.. both of which i have? Of course im getting it checked out for a 2nd opinion... but my computer has already stored codes from the SES light it threw for the o2 sensors.. Ive scanned the codes myself and so did chevy, we both came up with the same thing.

Dont be pissy just because we dont agree on things in another thread...

 

JD my man, give the kid a break, you were stupid and knew it all at one time too. Maybe not as hard headed but c'mon. I'm done with that part.

Now, from what I heard of the "knocking ticking" sounds was a bad seal between the manifold and the "y" pipe and or to the heads. I have the same sound coming from both sides of my engine and it's the headers needing to be tightened again but I'm a lazy fawker. Now, get underneth the thing while it's running but make sure it's sat for a long time so it's not to hot yet. Put your hand close to the pipes where the manifold meets the "y" and see if you can feel air. Or, if you can see it good make sure the engine is cold and spray soapy water on the area and look for bubbles. After the exhaust heats up it'll go away obviously but before then.... you get the point. Another thing and some people may think I'm dumb for this and only do it if you want to. Go get some 20w-50 oil and do an oil change. If it goes away for the most part then it's enternal and if it stays the same then it's external but don't keep that oil in there for long, your engine won't like it and don't run that stuff on a cold day.

 

hmm... i could try that 20w-30trick and what not pretty easily.. that sounds like a good idea in helping me determine the true problem thanks for the advice bro.

 

that doesnt sound like a valve tick to me. mine sounded, more high pitched. like someone was saying "tick tick tick tick" fast. but could be a exhaust leak like bidi said

 

yeah. Which would **** me off because that means i paid chevy 54 bucks to bs me 100% and not just the 80% i thought they had. Cant wait for that 2nd opinion on wednesday... hopefullyit will yield better news/the truth.

 

Does the sound increase with RPM? I sounds a lot like an exhaust leak to me. Think about checking the EGR feed, it sits on the back of that manifold.