To everyone that's been following along on this grizzly problem, I just got back from speaking to Jupiter Chevrolet, where I've taken my car in for work before. They were great!!! :party: Malcolm, the service manager, was really nice, and he agreed to go ahead and take care of the engine under warranty. He said he'd omit the 6800 rpm part from the write-up, so there wouldn't be any suspicion from General Motors when they do their inventory. I also got a chance to speak to Ken, the GM of the dealership, and he informed me that he wouldn't be able to do this if anyone found out about it, so I guess this is a one time offer. All in all, very great people, who don't give a damn about the GM reps :chevy



[Modified by MaluZ06, 7:32 PM 3/10/2003]

 

Grinding sound ?? Hmmmm....Anytime you hear a grinding sound it can't be good.

But I doubt that you blew your motor..Did you hear a loud bang ?? Any backfiring ? Smoke ?

:cheers:

Jeff

 

Jason , are you running N2O on your car ?? It's very rare that a stock Z06 would blow a motor if it was a stock set up.

I'm sure that once the dealer runs a quick Diagnostics on the car they will know exactly what happened..The good news is if it's stock , your warranty should cover any and all of the work .

Keep us posted !

:cheers:

Jeff

 

newbie with three posts, shifts at 300 rpm above limiter= :bs

 

Sorry to hear this. You're probably in for a major battle with your dealer and also GM. Although warranty is there, mods, if they can prove you were racing, etc., they will try to avoid replacement, whatever it is.

Good luck! 3rd to 4th at 6800 :nono: :confused: :chevy :flag :chevy :flag

 

7000 RPM is awefully High..I'm pushing the limit with my Rev Limiter set at 6700 RPM.

Maybe you broke a valve spring ?? If the dealer knows that you upgraded your cam and heads you can kiss the warranty good bye..Unless of coarse you have a buddy that works at your dealer :D

Good Luck !

Jeff

 

If, after hearing this "grinding sound," the car won't even crank, let alone start, I would guess it is more than a valve spring. I can't see how a valve spring would lock up the engine. If the starter engages but cannot turn the engine, something "big" is locking it up. Could be a rod or crank. Have you check the sides of the block for possible damage?

 

hmm, not sure why everyone is calling BS? Is there something about this user I should know?

its not unusual to see Z06 owners bump the limiter up. 6800 might be a bit much, but its not like I haven't seen it before. In regards to the motor cratering, my buds bonestock 02 EB Z06 grenaded with 500 miles on the clock. Ended up being a GM buyback and he repurchased another EB Z.

No big deal fellas, its just a car and poopie happens :smash:

and sorry to hear about that Malu. I'm sure there must be a mod friendly dealer in the area that might help you out.

 

Highway racing off GB tollway? :D

Maybe a valve spring let go and caused a chain reaction. With a high lift cam like the F-1, if a spring broke at those rpms "boom bitch"! Good luck getting it fixed.

Whats with all the BS icons people? :rolleyes:

 

First of all Malu,
Welcome to the forum.
Don't worry about the BS flags.

The 02 Z06 has light Valves that don't really even float until 7200 rpms. Are the Fastech Valve Springs a dual spring..what is the seat pressure. In the event that you are describing I have to assume that maybe you broke a valve spring..or at worst cracked a piston. I have not seen one happen yet..but you may have broken your timing chain too..If the cars cranks and will not start. I had 3 cracked pistons and my car would start and run..in fact I drove it to the dealership..with 3 cracked pistons..repaired under warranty.
Good Luck :thumbs:


[Modified by Shinobi'sZ, 4:53 PM 3/9/2003]

 

Malu, We need more info to try to help you figure out what happened. Obviously your dealer or mechanic will soon know, but presumedly you would like to know now.
The fact that the engine won't start or turn over could be caused by many things not in the engine itself. For example the transmission could be broken with the clutch locking it up also.
Sorry this happened to you, tell us how it comes out, about what happened.
Your first post just struck me as odd also, because the 6800 rpm business doesn't compute with a 6600 rev limiter, until I read your later post with your many mods listed, then it makes perfect sense. Maybe that is why it might have rang a bell for someone else.
Sorry you have to be welcomed to this forum under these circumstances, but welcome!

 

F-1 cam and long tubes are gonna void the factory warrenty.

 

Was this before or after the big turbo Supra went flying off GB Tollway @ 60+ MPH?? :eek: :eek: :eek: :eek: :eek: It was a crazy night last night for sure. ;)

Sorry to hear this and I would give Shawn @ MMS a call asap to see what your options are as he can guide you best in this sort of senario... :yesnod:

I hope it all works out for you,

BP

 

I had a blower with a blown motor and it did not void my warranty..it really depends on the dealership. I used to have a 97 with H&C, LT's..it did not void it either..you gotta know your service rider and what their expectations and limits are.

Who is Shawn at MMS?
I have not heard of him yet? Maybe Al, Joe, Karen, Bubba, or Mike..


[Modified by Shinobi'sZ, 4:58 PM 3/9/2003]

 

let's see, come on guys it shut off and locked up...........timing chain broke and wraped up around crank........which would have broken the front cover and caused an oil leak. Let me know if my guess is right.

 

I mentioned timing chain in my first post..I went in hopefully best to worst case...unless somehow he threw a rod after the timing chain came off..I have done that before too...actually the harmonic balance fell off, the Crank Broke, and all hell broke lose, as I rode ontop of the balancer as it got stuck between the pavement and the tranny..on a bridge doing 90 mph... :eek: :crazy:

 

One more thing that might help. There was a CEL on and found that it was a PCM code P0342 as per the vehicles dash computer. Thanks for all the help.

 

i've had a nasty view of a balancer trying to exit the engine compartment via the hood myself.......from behind the windshield. Not too good

 

:iagree: Looks like time to go into the motor. Hope you can get a big bore and port those heads.

Sounds like it was interesting weekend out in Texas. We had a 96 RT/10 go off 575 in Atlanta looked ugly. :eek: First weekend with good weather in what seems like months it was fun ;)

 

DTC P0342

Circuit Description

The camshaft position (CMP) sensor works in conjunction with a 1X reluctor wheel on the camshaft. The powertrain control module (PCM) provides a 12-volt reference, a low reference, and a signal circuit to the CMP sensor.

The CMP sensor determines whether a cylinder is on a firing stroke or on an exhaust stroke. A magnet within the sensor produces a magnetic field. The reluctor wheel of the rotating camshaft interrupts this magnetic field. The sensor's internal circuitry detects this field and produces a signal which the PCM reads. The PCM uses this 1X signal in combination with the 24X signal of the crankshaft position (CKP) sensor. The PCM uses this information in order to determine the crankshaft position and the stroke. The PCM monitors for a loss of the CMP sensor signal.

As long as the PCM receives the CKP sensor 24X signal, the engine will start. The PCM can determine the top dead center for all of the cylinders just by using the CKP sensor 24X signal. The PCM uses the CMP sensor 1X signal in order to determine which stroke the cylinder at the top dead center is on. The PCM determines if the cylinder is on the firing stroke or on the exhaust stroke. The system attempts synchronization, and looks for an increase in the engine speed indicating that the engine started. If the PCM does not detect an increase in engine speed, the PCM assumes that the PCM is incorrectly synchronized to the exhaust stroke. The PCM synchronizes to the opposite cam position. A slightly longer cranking time may be a symptom of this condition.