Can the ignition coil make noise?

[StockMan]

I posted a problem way back with a strange 'Churping' or 'Squealing' noise that seemed to come from the engine compartment.  I ruled out all of the obvious things, like ps pump, alternator, water pump.  The sound never really went away, but did seem to become less prominent as time passed.  And, over time I moved to a new transmission and then to another motor.  After that I figured I would be done with the annoying sound but lately I've been hearing it again.  The only engine/trans components that are the same on the car are the coil, plug wires.  The 'Sound' I'm hearing actually changes slightly with changes in timing, and seems to be more prominent in the more advances timing positions.

This brings me to my question, are ignition coils capable of making noise?

Thanks 

[Ghoste]

No.

[StockMan]

I'm baffled then.  What could possibly generate this type of noise?  I've ruled out many things like, like all the belt driven components, and the engine/trans are both new since the problem first began.
And it does change slightly with adjustments to timing, which lead me to believe its something close to the ignition system.
Its not as prominent at cold engine temps.  Any ideas would be greatly appreciated. Thanks

[green69rt]

Are you 100% sure it's not belts?  Easy way to check is to get a spray bottle of water and spray on the belts while engine running, if noise changes or stops you found the problem.  

[StockMan]

The sound still occurs with all belts off. Thanks.

[ottawamerc]

Possible grounding in the coil? easy test is drop a different one in there and see if its gone?

[green69rt]

The sound still occurs with all belts off. Thanks.

Oh, then

[StockMan]

Thanks for your replies, its not easy diagnosing an odd noise when you can't listen to it. 
Ghoste is probably right about coils not making noise, but for the peice of mind I may just try a different one, not much to swapping it over.

[Ghoste]

Ghoste is seldom right, just opinionated.

[StockMan]

Ha, I'm sure if you were here you'd have this thing figured out...

It wouldn't be so bad but I've been after this %$@$% noise for a while now, new 440, new trans, new everything, and the noise comes back???
Frustrating...

Well, I'll have to keep an eye on it, the source will reveal itself sooner or later...

Thanks

[ws23rt]

These cars are not rock solid. Lots of flexing going on. I would try  a soapy spray on things like hood hinges, rubber isolators, etc.

[green69rt]

Another idea...look at the shock tower nuts.   They shouldn't squeak but who knows?    Just give them a turn tighter.

[StockMan]

Thanks for the ideas, I'm ready to try anything.

[469 runner]

Is your coil aftermarket or stock?  I had a Mallory coil that was very noisy, buzzed all the time.  I don't mean buzzing through the radio speaker, actually buzzing loud enough to hear inside the car. I had it mounted to the firewall and even tried rubber isolators.  No help.  It was a coil not in oil but epoxy. Had to be a manufacturing  defect.  Tossed it and got another, it was quiet.  I think the epoxy was loose in the first one.

[Ghoste]

Buzzing wouldn't surprise me, like a transformer.  Who am I to say they shouldn't squeal or chirp?

[A383Wing]

dry dist shaft?

[StockMan]

I had the distributor apart and lubed it before assembly.  I used a stock coil as well, it would be quite old to.
I'm going to try another coil, wouldn't that be something else if thats all this was.

And like I mentioned, certain timing positions seem to trigger it.  Adjustments to timing would also affect dwell, which could leave the coil charging differently.
The odd thing though is that when I shut it down, just as it comes to the point where engine stops, it lets out a short 'Churp' or squeak.

I look forward to trying another coil, I'll report back after I do this.
Thanks

[A383Wing]

exhaust rubbing frame or something? heat riser? motor mounts?

[tan top]

dry dist shaft?

was just thinking something going on in the distributor    
springs come off & jamming up somewhere   but if you had it all appart & you say the timing ok anyway  ,

this is a far out  idea / thought now !
what about the distributor shaft bushing in the block ,  different metals expand at different rates , when the block heats up the bushing is looser  , maybe the oil pump gear it tight too in the bushing  
 , & in reality you prolly would not hear it turning anyway , like i say was just a far out guess , cause all what the other guys have mentioned , i think  just about covers all the things that could make a noise ,
just had another thought , did you  try running the motor with out the power steering belt ,? what about problem with fan clutch arrr but you said you took all belts off , forget that then , & you have replaced most parts & noise is still there  

got me racking my brains now  , what pulley set up , has your car got AC ,  , or what about the parts you have not replaced ?
any chance you could post some pictures of engine bay , or a video of the motor running with the noise ,

[thegeneral266]

Hi There,
I had the same noise on my 68 charger, it came and went and drove me bananas I eventually tracked it to the PCV Valve on the engine.
I replaced it and never heard the noise again
Phil

[A383Wing]

just remembered last night one of my cars had squeaking noise at times...turned out to be a galled rocker arm & rocker shaft

[chargd72]

I would get a mechanic's stethoscope and put it on every piece under the hood until you find the culprit.

[469 runner]

I would get a mechanic's stethoscope and put it on every piece under the hood until you find the culprit.

That's the best idea yet.

[PlainfieldCharger]

dry dist shaft?

Start here....

[ws23rt]

Maybe something inside timing cover. cam bolt, chain, oil slinger ?
OOps you said you changed engine.  Body parts come back to my thinking if it's not a talking coil.