C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Clacking noise-pass.side-intermittent

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Old Sep 1, 2001 | 12:19 AM
  #1  
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Default Clacking noise-pass.side-intermittent

Just recently i started to hear this noise from the
pass. side of the engine.When i start it in the garage the
sound is much more noticible.It sounds like a lifter but as you rev the
motor it will seem to go away.The oil pressure is at about 50psi when
cold,about 42psi when at cruising speed warm. I tried changing the oil and
filter,but still sounds the same.After i drive around a little bit i do not seem to hear it at all. Could this be a collasped lifter?? Never heard one before,so i do not know what i should hear.Kinda sounds like someone who plays spoons as an instrument.Best description i can think of!! The car has about 65k on the odometer.Any ideas as to how i can test the lifters without teardown??
Should i keep driving it?? I can do the work myself,so that will not be a prob.
Suggestions for a fix appreciated,
Matt
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Old Sep 1, 2001 | 12:56 AM
  #2  
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Default Re: Clacking noise-pass.side-intermittent (6spd.89)

Sounds like the Pre-Cat in the front Y-pipe has worn out. Fairly common problem. Try to get as close as you can to it. Should be self evident if that's where the noise is.
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Old Sep 1, 2001 | 02:05 AM
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Default Re: Clacking noise-pass.side-intermittent (6spd.89)

Someone else told me about the fuel line doing this...and that there was a fix for it...I have the same problem.....a clacking or clicking noise...like something is hitting something on the passenger side...I cant hear it well when I get out of the car though...and it dissapears while dirving.
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Old Sep 1, 2001 | 09:03 AM
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Default Re: Clacking noise-pass.side-intermittent (6spd.89)

6spd.89...I saw you replied to my same post. I have the same thing going on. When I am driving, I don't really hear it but sometimes when I am in park (usually after driving for awhile) it will kick up and start ticking a little. It's kind of embarrassing when people are checking out your car and it starts ticking. :(

I am going to take mine to let a couple mechanics look at it this weekend and I will post it if they have anything smart to add. :D There doesn't seem to be many guys around my area that know much about Vettes.

I did have a mechanic from my local Chevy dealer listen to it and he said if it is a lifter sticking you can still drive it but you shouldn't let it go too long.
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Old Sep 1, 2001 | 10:30 AM
  #5  
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Default Re: Clacking noise-pass.side-intermittent (Gixxer)

Let us know what the mechanic says,this is really embarrassing at times
not to mention that we might be hurting our engines!!!!!
Matt
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Old Sep 2, 2001 | 12:17 AM
  #6  
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Default Re: Clacking noise-pass.side-intermittent (6spd.89)

I had the same problem with my 92 Coupe. There is a Chevey retrofit kit to correct the problem with the fuel line hitting the inter fender on the passangers side.

I can get the part # for it on Tuesday from the people who maintaine my 92 if you would like it.

I had it installed about two years ago and no more noise.
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Old Sep 2, 2001 | 12:41 AM
  #7  
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Default Re: Clacking noise-pass.side-intermittent (6spd.89)

Hey Matt
Try checking the hood, i had the same noise about a month ago, my pass side of the car, i only could hear it when i was in the car, Fix it the other day,
it was a hood gulde pin lose.
hope that help
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Old Sep 2, 2001 | 10:29 AM
  #8  
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Default Re: Clacking noise-pass.side-intermittent (1988L98)

Thanks i will check my guide pins as well!!I think i found it!!
Slid under the car and beat on the pre-cat with my hand and
the noise got worse!!! I can make it sound like whatever i want.
But ,now how to fix my pre-cats from this NOISE???
I also am gong to check the fuel lines as well that another member
had posted. Anyone fill me in on how to eliminate my noise situation,if its just the pre-cats???
Matt
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Old Sep 2, 2001 | 02:06 PM
  #9  
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Default Re: Clacking noise-pass.side-intermittent (6spd.89)

The saga continues!!!! Jacked up car and the clamp on the exhaust was
loose! This was just past the pre-cat,it is holding a 1/2" tube that runs
to the main converter. On top of that, the heat sheild in the same area
was missing a screw and moving around as well. I do believe that between
these two that the noise will be gone!!
Matt
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