[Z06] Do Z06’s have loud injectors ?
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,077
Likes: 1
From: Greenville SC
Do Z06’s have loud injectors ?
Picked up my Z06 last Sunday at the dealer. On the way home I noticed a clatter coming from the engine as I accelerated, that sounded almost exactly like engine knock when you put low octane fuel in a high compression engine. I assumed the dealer had put a full tank of cheap gas in the car and went about riding around to burn it and get some 93 octane in there. Well, I put a full tank of the good stuff in a completely empty tank and the noise is exactly the same. I remember when I had my Z28 there was some talk on the LT1 forum that injectors made a noise that sounded like pinging from bad gas. Is that what it is?
Thanks.
MD
Thanks.
MD
Burning Brakes
Joined: Jul 2001
Posts: 776
Likes: 0
From: Dunnellon Florida
Re: Do Z06’s have loud injectors ? (Z06-Nomad)
Yes,you can hear the injectors and yes they sound just like you described.
Both of my Z06's have the same noise.My '02 is quieter than the '01 was.
Both of my Z06's have the same noise.My '02 is quieter than the '01 was.
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,077
Likes: 1
From: Greenville SC
Re: Do Z06’s have loud injectors ? (av8or3)
av8or3,
Thank you a thousand times for your response. Even though I suspected that is what it was, I was starting to get that sick feeling that something might be wrong with it.
MD
:cheers:
Thank you a thousand times for your response. Even though I suspected that is what it was, I was starting to get that sick feeling that something might be wrong with it.
MD
:cheers:
Burning Brakes
Joined: Feb 2001
Posts: 892
Likes: 1
From: Houston Texas
Re: Do Z06’s have loud injectors ? (Z06-Nomad)
Sent you an email with a little more information. I cant believe this website always changes the links around back to this forum.
[Modified by Av8ter, 7:45 AM 9/7/2002]
[Modified by Av8ter, 7:45 AM 9/7/2002]
Drifting
Joined: Oct 2001
Posts: 1,366
Likes: 0
From: America
Re: Do Z06’s have loud injectors ? (av8or3)
av8, funny........my '02 is louder than my '01 Z.........injector wise, & lifters......( cam profile change I assumed).......more lift & duration..... :eek: :rolleyes: :D
Instructor
Joined: Jun 2002
Posts: 100
Likes: 0
From: San Diego CA
Re: Do Z06’s have loud injectors ? (ZO6LS6)
My Vette mechanic believes the noise can be eliminated by changing the valvetrain geometry (pushrods / rockers). I've also read posts where aftermarket head/cam setups don't have the unusually loud valvetrain noise the stock ZO6's have. Perhaps an experieced LSx engine builder can chime in here?
While I was at the dealer asking about the noise, I noticed a 2001 ZO6 on another lift, and noticed the engine was torn apart. I asked what happened and I was told there was "some kind of engine problem". I walked over to the bench and picked up a roller lifter and looked at the cam. Roller lifter failer: it was hammered badly, pitted, and deformed and the cam was heavily scored. The car had around 10,000 miles on it (I could not see any evidence of mods (stock airbox, exhaust, etc.)). I am aware of at least one other failure of this kind on a 2002 ZO6 (a forum member). Sorry I did not note which lifter had failed (I believe the scored lobe was near the end of the camshaft). Intuition tells me that all the hammering (resulting in noise) could fatigue the metal on the roller and cam. My car has one lifter that is significantly louder than the others (a buddy pointed this out). The noise comes and goes, though. Putting 2+2 together = :confused:
SportsCars
While I was at the dealer asking about the noise, I noticed a 2001 ZO6 on another lift, and noticed the engine was torn apart. I asked what happened and I was told there was "some kind of engine problem". I walked over to the bench and picked up a roller lifter and looked at the cam. Roller lifter failer: it was hammered badly, pitted, and deformed and the cam was heavily scored. The car had around 10,000 miles on it (I could not see any evidence of mods (stock airbox, exhaust, etc.)). I am aware of at least one other failure of this kind on a 2002 ZO6 (a forum member). Sorry I did not note which lifter had failed (I believe the scored lobe was near the end of the camshaft). Intuition tells me that all the hammering (resulting in noise) could fatigue the metal on the roller and cam. My car has one lifter that is significantly louder than the others (a buddy pointed this out). The noise comes and goes, though. Putting 2+2 together = :confused:
SportsCars
Burning Brakes
Joined: Jul 2001
Posts: 776
Likes: 0
From: Dunnellon Florida
Re: Do Z06’s have loud injectors ? (Z06-Nomad)
I wish to clarify the info I laid down earlier.The ticking noise that you
hear is the fuel injectors,it sounds like valve train noise up to the point
where the other engine noises drown them out (about 2700 rpm).
There is another noise that began with the '02 (and may be with the
'03) that can be described as a "jingling" noise that originates in the
exhaust system at the crossover pipe.It is heard some on acceleration
and lots on deceleration.This noise sounds very much like "pinging"
that is caused by low octane fuel.
I don't doubt the fella's story about the broken engine,but I wouldn't
worry that it's about to happen with your car.I drove my '01 for 20k
(flogged it everywhere I went too) with it making that ticking noise &
I have no doubt it still runs like a scalded dog and most certainly is
still ticking.My '02 ticks but not as loudly as my '01 did and I'm not the
least bit worried about it.Break that car in gentle for 500 miles and then
drive it like you stole it.At WOT the exhaust makes ALL undesirable
noises disappear. :yesnod:
hear is the fuel injectors,it sounds like valve train noise up to the point
where the other engine noises drown them out (about 2700 rpm).
There is another noise that began with the '02 (and may be with the
'03) that can be described as a "jingling" noise that originates in the
exhaust system at the crossover pipe.It is heard some on acceleration
and lots on deceleration.This noise sounds very much like "pinging"
that is caused by low octane fuel.
I don't doubt the fella's story about the broken engine,but I wouldn't
worry that it's about to happen with your car.I drove my '01 for 20k
(flogged it everywhere I went too) with it making that ticking noise &
I have no doubt it still runs like a scalded dog and most certainly is
still ticking.My '02 ticks but not as loudly as my '01 did and I'm not the
least bit worried about it.Break that car in gentle for 500 miles and then
drive it like you stole it.At WOT the exhaust makes ALL undesirable
noises disappear. :yesnod:
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Le Mans Master
Joined: Dec 1999
Posts: 5,169
Likes: 6
From: Greenville SC
Re: Do Z06’s have loud injectors ? (av8or3)
Yes,you can hear the injectors and yes they sound just like you described.
Instructor
Joined: Jun 2002
Posts: 100
Likes: 0
From: San Diego CA
Re: Do Z06’s have loud injectors ? (av8or3)
I wish to clarify the info I laid down earlier.The ticking noise that you
hear is the fuel injectors,it sounds like valve train noise up to the point
where the other engine noises drown them out (about 2700 rpm).
There is another noise that began with the '02 (and may be with the
'03) that can be described as a "jingling" noise that originates in the
exhaust system at the crossover pipe.It is heard some on acceleration
and lots on deceleration.This noise sounds very much like "pinging"
that is caused by low octane fuel.
I don't doubt the fella's story about the broken engine,but I wouldn't
worry that it's about to happen with your car.I drove my '01 for 20k
(flogged it everywhere I went too) with it making that ticking noise &
I have no doubt it still runs like a scalded dog and most certainly is
still ticking.My '02 ticks but not as loudly as my '01 did and I'm not the
least bit worried about it.Break that car in gentle for 500 miles and then
drive it like you stole it.At WOT the exhaust makes ALL undesirable
noises disappear. :yesnod:
hear is the fuel injectors,it sounds like valve train noise up to the point
where the other engine noises drown them out (about 2700 rpm).
There is another noise that began with the '02 (and may be with the
'03) that can be described as a "jingling" noise that originates in the
exhaust system at the crossover pipe.It is heard some on acceleration
and lots on deceleration.This noise sounds very much like "pinging"
that is caused by low octane fuel.
I don't doubt the fella's story about the broken engine,but I wouldn't
worry that it's about to happen with your car.I drove my '01 for 20k
(flogged it everywhere I went too) with it making that ticking noise &
I have no doubt it still runs like a scalded dog and most certainly is
still ticking.My '02 ticks but not as loudly as my '01 did and I'm not the
least bit worried about it.Break that car in gentle for 500 miles and then
drive it like you stole it.At WOT the exhaust makes ALL undesirable
noises disappear. :yesnod:
Since there are many posts about the noise and only two examples of failures, it sounds like there is no durability problem. My mechanic is confident the sound we are hearing is from the lifters and steep cam slope/ramp combined with what he calls "incorrect geometry". He's been building race engines for many years. Other muscle car buddies tend to agree. It sure sounds like a pump-up issue with the hydraulic roller lifters: rev your engine and let it settle. On my car, I can hear the lifter noise/clatter at a higher sound level before settling down. However, the frequency of the clicking does *not* change (the engine is at a fixed idle RPM). If it were the injectors, the frequency would change. All I hear is the amplitude (volume) change. This points to the hydraulic roller lifters.
SportsCars
Intermediate
Joined: Jun 2002
Posts: 32
Likes: 0
From: GOOCHLAND VA
Re: Do Z06’s have loud injectors ? (SportsCars)
I can hear what appears to be a loud valve tap coming from one cylinder. Its only noticeable around 1700 to 2000 RPM then. I don't hear it at lower or higher engine speeds. I can also hear the injectors. I am wondering if oil pressure is a factor. When hot (200F), I am only getting about 40PSI at those engine revs. When cold, the pressure is about 50PSI at the same revs. When I get the time, I bringing it in to the dealer. Can't stand the exhaust jingle either. Sounds like Santa is coming to town.
:cheers:
:cheers:
Instructor
Joined: Jun 2002
Posts: 100
Likes: 0
From: San Diego CA
Re: Do Z06’s have loud injectors ? (vetthead)
I can hear what appears to be a loud valve tap coming from one cylinder. Its only noticeable around 1700 to 2000 RPM then. I don't hear it at lower or higher engine speeds. I can also hear the injectors. I am wondering if oil pressure is a factor. When hot (200F), I am only getting about 40PSI at those engine revs. When cold, the pressure is about 50PSI at the same revs. When I get the time, I bringing it in to the dealer. Can't stand the exhaust jingle either. Sounds like Santa is coming to town.
:cheers:
:cheers:
1. Lifter noise.
We fired my car up first thing in the morning, and no noise. :confused: There was another 2002 Z06 in the bay next to mine, they fired it up. It made the lifter noise :crazy: . The dealer called the noise normal. Temperature, RPM, and oil type appears to affect the noise.
2. Exhaust jingle.
Dealer repro'd the noise. They said wait for a fix from GM. Based on the posts on this forum, this problem has been around for a very long time. If you want it fixed, you'll probably have to do it yourself (X-pipe). I'm having mine fixed tomorrow (by a private mechanic).
SportsCars
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,077
Likes: 1
From: Greenville SC
Re: Do Z06’s have loud injectors ? (av8or3)
I wish to clarify the info I laid down earlier.The ticking noise that you
hear is the fuel injectors,it sounds like valve train noise up to the point
where the other engine noises drown them out (about 2700 rpm).
There is another noise that began with the '02 (and may be with the
'03) that can be described as a "jingling" noise that originates in the
exhaust system at the crossover pipe.It is heard some on acceleration
and lots on deceleration.This noise sounds very much like "pinging"
that is caused by low octane fuel.
I don't doubt the fella's story about the broken engine,but I wouldn't
worry that it's about to happen with your car.I drove my '01 for 20k
(flogged it everywhere I went too) with it making that ticking noise &
I have no doubt it still runs like a scalded dog and most certainly is
still ticking.My '02 ticks but not as loudly as my '01 did and I'm not the
least bit worried about it.Break that car in gentle for 500 miles and then
drive it like you stole it.At WOT the exhaust makes ALL undesirable
noises disappear. :yesnod:
hear is the fuel injectors,it sounds like valve train noise up to the point
where the other engine noises drown them out (about 2700 rpm).
There is another noise that began with the '02 (and may be with the
'03) that can be described as a "jingling" noise that originates in the
exhaust system at the crossover pipe.It is heard some on acceleration
and lots on deceleration.This noise sounds very much like "pinging"
that is caused by low octane fuel.
I don't doubt the fella's story about the broken engine,but I wouldn't
worry that it's about to happen with your car.I drove my '01 for 20k
(flogged it everywhere I went too) with it making that ticking noise &
I have no doubt it still runs like a scalded dog and most certainly is
still ticking.My '02 ticks but not as loudly as my '01 did and I'm not the
least bit worried about it.Break that car in gentle for 500 miles and then
drive it like you stole it.At WOT the exhaust makes ALL undesirable
noises disappear. :yesnod:
Not to say I'm against diagnosing REAL problems, but after it has been established that " these things just do that", Run the **** out of it (within the normal performance envelope of the vehicle), and enjoy every second of it.
MD
Intermediate
Joined: Feb 2002
Posts: 47
Likes: 0
From: Cranston RI
Re: Do Z06’s have loud injectors ? (Z06-Nomad)
Z06-Nomad, I have the same noise. In fact, for some odd reason, when I had my headers installed the noise seemed to grow much louder. Anyway, I'm not letting it bother me. I'm just enjoying the car. If something goes wrong, then the warranty will cover it :yesnod: .
