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17 replies

Buzzing sound - front of engine

push1267push1267Member
I've have had this humming, buzzing, whisling-like sound from the front of my engine for a full season now. It follows the revs and can only be heard from inside the cabin with the firewall engine cover on. With the cover of I just can't hear and locate it. Not very laud but quite annouing.

The sound comes on as the engine heats up, at first very quiet and then grows in noise level. It's there even after the engine has been out this Winter and a lot of parts gone over including a new Waterpump and cam chain. Could be the alternater but thought I should be able to hear it with the cover off.

Also replaced the PCV as I heard they can be quite noisy then they wear. Didn't change a thing. Listening to the PCV from the engine compartment it makes a humming sound but not very loud I think, but still, there's quite a bit of noise back there (engine has quite an aggresive cam).

Would there be different PCVs to try out, and has anyone experienced this before?


Thoughts would be very much appreciated
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V 4vandproudMember
I had a noise similar to what you're describing

I found the distributor gear did not have sufficient free play on the bottom side where it rides on the block ledge

I also found the drive gear on the cam severely worn

simple test would be to place a shim between the distributor housing & the block. if the situation is just barely in bind a .015" shim ~might~ do the trick?
V 4vandproudMember
quote:
Originally posted by Push1267:
Engine was build in 2008 - so the distributor is from that period. I checked with the cap off and the distributor shaft does not seem to bind.


I don't think you can easily check by just popping off the cap, you'd need to also remove the advance mechanism from the top of the assembly. the rotor attaches to a piece that is separate from the shaft that sticks out the bottom

hopefully your noise is just a vibration, but your description of it getting louder with engine temp sounds very much like my experience. as engine temp increases the clearance becomes less, possibly into bind
push1267push1267Member
Thanks for all your input.

I seem to have located the sound now. It comes from the MSD box and the coil. Both sit on the passenger side firewall next to the engine and the buzzing tick is transferred through the wall into the cabin.

That explains why I can hear it with the engine door in place and barely when the door is off.

Apparently very normal for analog MSD boxes to make this quite loud noise.

It could be the time for me to update to the much spoken for Pantera Electronics digital unit
panteradougpanteradougMember
quote:
Originally posted by Push1267:
Thanks for all your input.

I seem to have located the sound now. It comes from the MSD box and the coil. Both sit on the passenger side firewall next to the engine and the buzzing tick is transferred through the wall into the cabin.

That explains why I can hear it with the engine door in place and barely when the door is off.

Apparently very normal for analog MSD boxes to make this quite loud noise.

It could be the time for me to update to the much spoken for Pantera Electronics digital unit



Come into the new century and get rid of the trash.

The only one that will be sorry is MSD. You won't be.

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