Question: A Loud "Clanking" noise in the dashboard on the passanger side

[Nick90vetteguy]

Hey guys I was hoping anybody could help me, The past few days Ive been driving my C4 around, and noticed this LOUD clanking noise from the passenger side dash. You can hear it when your out of the car standing next to the engine but inside its louddddd, possibly something loose?

Doesnt sound like slappage but ive been told stories this may be the problem :ugh

 

[boomdriver]

Hey guys I was hoping anybody could help me, The past few days Ive been driving my C4 around, and noticed this LOUD clanking noise from the passenger side dash. You can hear it when your out of the car standing next to the engine but inside its louddddd, possibly something loose?

Doesnt sound like slappage but ive been told stories this may be the problem :ugh

Do you mean an engine noise that gets faster with the RPM, or just a rattle that RPM has little to do with?

I guess I'm asking if the sound moves with the engine speed...? Passenger side dash? meaning the right side of the engine?

Also, see this other recent thread regarding loose rods, spun crank bearings, broken rockers, bad lifters and loose flywheel bolts...:ugh:ugh:ugh and the sounds they might make.

http://www.corvetteactioncenter.com/forums/c4-technical-performance/126034-engine-noise.html

or,

it might just be a dirty fuel injector if it clicks instead of raps, bangs, clatters, rattles, knocks or clanks.



If its more of a shrieking noise, that would be an ex wife looking for her half of the tax refund......

 

[Nick90vetteguy]

Yea!! only when its in drive, its a clicking noise, it rides perfect, when i put it in park it goes away honestly it sounds like theres something in the glove box but there isnt,

 

[Nick90vetteguy]

I read your link it sounds like what im expierenceing but when i open the hood i dont hear anything, when it idles at 1,000 its loud, like annoying

 

[Nick90vetteguy]

Thanks agian BOOMDRIVER!!

lol @ the joke lol

Ok so Imma give this Marvel Mystery oil a shot is this it?


Advance Auto Parts: Oil and Gas Additive by Marvel Mystery Oil - Part MM13R

 

[Nick90vetteguy]

You can hear it when your out of the car standing next to the engine but inside its louddddd, possibly something loose?

Sorry I meant you CANT hear it when you stand next to the engine

 

[boomdriver]

Sorry I meant you CANT hear it when you stand next to the engine

An auto trans is supposed to have some issues with loose torque converter/flywheel bolts....I have read something about this somewhere.

This might be a broken cat....
hearing it more in the cabin tells me that its under the car, not under the hood so much.

see if you can jack it up or get it on a lift and have someone listen underneath....a broken cat might stop the rattle when the RPM goes up, then begin again as the rpm drops.. The flow of the exhaust pushes the pieces against the cat insides when rpm is up, but idle is not enough exhaust pressure to hold the chunks so they flop around in the cat housing and rattle like crazy... See about this asap because the cat will eventually clog and/or the chunks get blown into the mufflers and clog them.

That is, if you agree this is an irregular rattling type noise...fairly loud like a nickle in a beer can....tin.

If it rattles exactly in time with the engine, its not a cat.

if this is the click or ticking thats very rythmic, but mild, try the MM. Just be sure to read Hibs post about other possibilities and mechanical issues that MM won;t cure.

This is ALL about the definition of the sound..rythmic clicks are injectors, (everything gets progressively worse in this list) ticks or taps more likely to be lifters, raps are small end rod bearings, banging, big end rod...bumping/thumping/clunking ...spun main, when originating from the motor.

Then again,. I'm just guessing !:ugh

.....and yes, thats the correct MM engine repair in a bottle. Mystery oil for mystery noises.... (some folks hate hearing that ! ! )
Just ad a few oz to the motor oil, and a dose in the gas. You will notice it seeming to run better right away. Change the oil after a few days. Put easy miles on it with the MM in the oil. Freeway and normal driving is fine...just no street racing or high speed runs.
Give it 100+ miles or run that tank of gas out then change the oil.
MM thins the motor oil so there is less high-load protection. About the opposite of what STP does...

Hope this helps !
... in case it don't, find a mechanic in a shop when the mechanic in the bottle don;t fix it !

 

[Nick90vetteguy]

if this is the click or ticking thats very rythmic, but mild, try the MM. Just be sure to read Hibs post about other possibilities and mechanical issues that MM won;t cure.

Its not really a ryhtmic sound, lets say your sitting in the passanger seat, i roll up to a light(its red) its in OverDrive and we come to a complete stop, couple of seconds go by and then you hear this loud clinkin sound only when I stop, when its in park it doesnt make that sound, when i accelerate its gone

 

[boomdriver]

Its not really a ryhtmic sound, lets say your sitting in the passanger seat, i roll up to a light(its red) its in OverDrive and we come to a complete stop, couple of seconds go by and then you hear this loud clinkin sound only when I stop, when its in park it doesnt make that sound, when i accelerate its gone

yeah, I say broken cat...but as always get it confirmed asap before further damage results from running it like this.

 

[Nick90vetteguy]

Gettin it checked out! Thanks agian Boomdriver

 

[G Winter]

It could be the flex plate is cracked.


Glenn

 

[Nick90vetteguy]

Turned out to be a poor job on my end welding the cat to the exhaust pipe created a whistling sound that casued the cat to rattle more and more as i drove eventually the weld wore off from heat and started bangin under the car