Not sure where to start, but boils down to loud ticking noise, like a blown out spark plug, but it is not, and a knocking noise.
I have checked rockers, pushrods are not bent and no broken springs, and i beleive i do not have a collapsed lifter.
#3 cyl is the suspect one, all cyl are 210 compression cept for 3 which is 230. all the plugs are a nice cream color, except for
3, which is black. the only things i have not checked is the coil and injector, am thinking the carbon build up has
increased the compression. I m thinking is a bad injector from the sounds and some you tube. Does this sound
possible to make these noises, has big cam, trickflow heads, fast 92 and a few other things. Oil pressure and coolant temps are good. Put it back together today and it started perfect and idle as usual. soon as i get the revs to 2500 it starts into the knocking and loud ticking like a leaky exhaust.
any thoughts would be appreciated. 2002 Z06 am the 3rd owner and previous owner had for 10 yrs and never modded it.

 

1st if you can check your front 02 voltage averages between left and right--see if there is a huge mismatch if so you may have a bad front 02
2nd Check your LTFT's between left and right--again if there is a huge mismatch it could be several things -Could be a bad 02 on one side ( ideally your front 02's should have an average voltage between .400 and ,550 millivolts or a FOULED injector The larger the average the richer that side is during P/T
Finally It sound as you think you may have a fouled injector especially if that one plug is black
With tuning software such as HP or EFILIVE you can turn OFF each injector one at a time--When you do that you should hear a deffinate reduction in RPM's and hear the engine labor--- That means that injector when turned OFF makes a difference which indicates it is working However if you turn off an injector and you hear NO noticeable reduction in RPM's or laboring that means that injector is not working or fouled---Go thru all 8 and see if you can hear changes one at a time--If you hear changes on the cylinder that means it is OK If you hear No changes--that means that injector is not working properly

 

Thank you very much..
Will check 02s today, i did unplug suspect cylinder and noticed no change. I will unplug one of the others to see the difference. Never thought about 02s. I was under it and didn t think about it. Maybe blew the left one out of the pipe, doubt it tho, would have seen it hanging. Also there are no codes.. should i not see some kind of codes for this ?
thanks for the suggestions sir.

 

The good ol lifter tick you’ll be taking off the heads for sure at least one side anyways at the least

 

took to the shop today, and soon as they start it to get off the flatbed, he calls me, says the bottom end is trash.
i thought he was joking wasn t to be.
the ticking wasn t tickng, it sounded like when one blows a spark plug out..
and hammering..
so i guess i m looking for a crank or a short block.
he has been in the business for many years runs his own shop. was at the highest level tech with GM.
i forgett what they call them..
so we will see what he finds in the next cpl days

 

How many miles you got on it ?


You were kinda on the right track with a fuel issue though I bet the why it misfired or pre ignition what kind of fuel do you run in it ?

 

50k miles
91

 

Shouldn’t be more then a lifter unless your getting down on it constantly abusing the car .

 

Nooooooooooo
might hit the red line once or twice in 8 hr drive.
tech seems to think crank bearing. don t know till he gets the pan off.
i had it off. there where no extra parts in there.

may hit 6k for cp of shifts. but what is the 10sec max.. thats not gonna hurt it.

 

Sounds like the increased horsepower you got out of the motor shortened its life. Odd, considering how well built these things are.

 

Was it stock or turbo / supercharger?

 

Yes yes it is kind of strange I thought, I didn't build it it was built by a lot California more than 10 years ago so I don't know a friend of mine important it had it for 10 years didn't beat on the thing too much and I don't know that's the way it goes I guess I'm surprised at 50,000 miles.

 

n / a

 

Well rip down the engine and see what going on get it on a stand


Mines pushing like 2.5 x the power and has nearly 3 x the mileage somethings up with proper practices of maintenance or driving styles engines just don’t go but lifters can surly and cause damage but we won’t know what it what it is until you or someone starts getting into that engine .

Its very possible a crank bearing took a dump on ya but I would place my odds on a lifter 1st as your tearing it down anyways lifters are right there before even pulling the motor it’s worth a look and a piston and bore inspection some light weight cleaning ...you might find it and only be 100 bucks deep in lifters and 25.00 on a head gasket some new bolts like 20 bucks and your golden...maybe at it’s a possibility lifters make hammering noises ....rod bearing can also crank so either way it’s pretty spent right now ...due to that every day 6k -7k redline just got the best of it it’s not a Lamborghini man lol ....just a little 346 ....live and learn right next time you suspect a injector not functioning right hook up the scan tool ...something’s still wrong throw some octane booster in it ...never hurts ...last but not least I run e-85 full 88% from my spot ...uses more but hey one less worry ...50k bummer hopes it gets better for ya ...keep us posted .


If the pistons ain't cracked and your crank area doesn’t have any damage rebuild it with a 383 or something fun...

 

Hahah thanks speedy, I sent it into the shop yesterday so he's a busy guy I'm sure he'll look at it straight away and see what's going on in there, he is always reliable and trustworthy tech, when I was texting him he said it could possibly probably be a lifter collapse I don't think so but I don't know, then when he listened to it he says for sure it's something in the bottom end, I can accept that. Like I said I don't beat the thing if I mowed on a cruise for two or three hours or an evening with the guys I might hit six grand once maybe twice but that's about it most of the time it's like I don't know three four thousand twenty five hundred shift points. I had a Donald last year and it was 492 to the wheels, I put techron in and every once in awhile it's not a big deal it's not going to do anything for something like this. I was reading yesterday that the stock bottom ends are good for 900 horse, so I shouldn't have a problem there LOL.
Thanks for your input man.
I'm I'm already on the hunt for a crank, short block for a bear block bearings. I was thinking about a stroker but I don't know if my top end stuff is compatible with a 383. But that would be flipping awesome

 

Did you check for a bad plug wire?

 

Where’s the car at ?

 

It will be fine 383 that little sucker ...u could always stick a 376 ls3 block and all your top end will fit ...it’s what some of boosted folks do for a monster Frankenstein build ...cathedral ports will fit ....just beef up the valve train a little .


I wasn’t taking Techron I was talking like octane booster Sunoco stuff at the least the 116 octane .... fuel ⛽️ f u can find 93 I would suggest that ...nothing less then 91 with Techron v-power ...Even stock the car ran like **** with 89- most stations 91 ...I found the v-power actually improved it not advertising for them just the truth ..now I use only the top e85 ..& well I don’t even run the knock sensors ...no need to even have um hooked up drawing power lol.

 

yes.. i know you were saying octane boost. i just threw the techron in.. i have access to 94, i usually do 91 with the techron v power.. sometimes Costco 91, they adv top tier gas.
lol @ drawing power..

 

That Costco water is prob what left the car in the shape it’s in just saying ...that stuffs nasty ...I really drained my tank right filling it one day on it ...oh it was horrible ....just horrid ...shouldn’t even be listed as 91 more 85..stick to your 94 ultra and you’ll be most happy and those fuel demons in your mind won’t come up !!! Lol