white man

iTrader: (1)

i'm hearing a unconsistant tink or clatter when i hit 50-60 mph then it goes away. no lag or any signs of lost power or transmission slip, just this sound that i don't like.

2001 Z-28 with an A4. no mods to the car

is this common or am i in for some trouble

MOBE

Coming from the engine?

Could be getting some detonation.

white man

iTrader: (1)

sounds like the back maybe where the tranny and block meet. 27,000 miles on it

RED2000Z28T56

Mine does the same thing but more at take off. It's a quick snapping sound. I am thinking it's possibly the U-Joints. I haven't had time to check them yet though.

white man

iTrader: (1)

i'm gunna check that cause it only does it when the pedal is on the floor. The car drives great and run's smooth as the day i got it.

z28hokie

I'll bet $5 it's the following:

Your PCV system is allowing a mist of oil into the intake. This has built up carbon inside of the engine. In turn, the engine runs lean, has hot spots, and pings slightly (my A4 does the same thing)

To check if this is the problem you have 2 options.
1) read your spark plugs (the hard way)
2) take off your intake lid, maf, and bellow. Push the throttle open (car off) and feel behind the throttle body plate. If it's oily, liquid or even just grimy (not just perfectly dry carbon). Then your pcv is misting oil. Mine was- but the oil level never dropped it was that slow. But after 40k miles- engine started to ping

Now, to fix it:
1) replace PCV valve ($4 or less)
2) engineer some way to seperate out the oil from the air (some people use filters...I used a home-made catch can to preserve system vacuum) $24
3) use GM top engine cleaner to clean out the intake, valves, and chambers (be sure to change oil after you are done with this process) $10

Oh, also not a bad idea to change your plugs after doing the top end cleaner. NGK TR55's are great, and it's not like platinums last as long as they are supposed to anyway.

4thGENRETARD

Pardon my ignorance but where is the PCV valve? Any pics? I think I have the same problem but no pinging yet.

soundengineer

iTrader: (16)

goes into the bottom of your throttle body...little hose coming out of the left side....connects to a bulky piece...inside is a little metal canister...thats the pcv valve.

white man

iTrader: (1)

cool i'll check that. my car is going in for a cut out and other crap next week and i told them to look in to the problem, i'll pass this info to them.

thanks

pimpmaro

Does anyone have a link to the PCV catch can mod? I've REALLY been meaning to do this, just haven't had the time or interest until of late.

4thGENRETARD

Thanks sounengeneer,
I'll replace valve and flush motor with oil change. Bt the way I use DENSO iridium plugs and they read "perfect".