buddhaz06

iTrader: (8)

Where to start... I have an 01 z06. Its auto swapped, and I had heads, cam, fast 90 and ls7 manifolds. I had to have my transmission looked at so I did s few things while it was down. I replaced the big ported 243 heads with some stock 243's and put headers on and went to a Vic Jr/elbow. My o2's weren't reading last time I tried to have it tuned so I got new ones when I did all this stuff. Now I have a what I would call pinging under a heavy load. 75% throttle or higher. The higher the louder the noise. The coolant temp goes up just a little bit when It makes the noise and I stay in it. The noise sounds like a tinny noise from the header. Sounds like gravel in my fender well kind of. Has to be over 3000rpm. It's done it ever since I got the car running except for one night it didn't do it at all and it ran smoother through the rpm's. I just put in some 110/91 mix fuel and filled it up but haven't got it to mix in and drive it much. Started raining.

Basically what I'm doing is trying to get the noise to go away again by something I can change to get a direction where to go with it. I want to get the car retuned but I don't want to go get it tuned just to find out I have a bad head/gasket problem. If I know it's tune related I'll gladly go get it tuned and be done worrying. Any advice would be awesome!! I have a snap on solus scanner and s couple buddies with hand held stuff that we can read data if I know what to look for. Please help! Thanks in advance!

V-seriesTech

iTrader: (5)

So your adding race fuel,..to try and get rid of knock, on a heads and cam car?

Dude, your doing it wrong.

You need to record data,..be it a tech II, a laptop, or a hand held with the ability to do so. Guessing,...and testing the way you are,..your gonna hurt something. Knock sensors can easily go bad,..plugs can come loose, water can sit inside the knock sensor area and cause issues..... but all of which would usually result in a knock related code...

You say your bussy has the scanner,...pull up the file area where it shows real time data. Look at Knock,.. what do you see? Anything changing during your testing? Any knock at all?

When you did this head and cam swap,..how about the factory plugs....or more commonly, the plug wires? Often people tug on these stock wires, and pull **** loose,.causeing apoor connection... resulting in an occasional miss. Ensure your wires are all on the plugs completely and also the coil packs.

All of your above issues, should be recorded by the ecm, and should trigger a dtc, or recorded passed/failed history code. Do you have any check engine lights? Flashing or solid?

Lots of variables here... go easy on it though until it's a golden goose again. IMO,..unless your running a really hardcore set of milled heads,...I don't see adding 110 to help with knock, is the wisest choice.... sounds like your tune would be a tad on the "hot" side.... but,..I am no tuner.

Happy hunting dude(s).