is this a normal sound pattern after vette is driven for awhile?

[bradvette]

I just had the main fan motor, temp sensor relay and fusible link replaced after running hot past 230 degrees, as the fan motor had recently shorted out (no wonder I sensed a faint smell of melting wires from under the hood :Roll ) Now the cooling system works as intended, right about 228F the main fan now kicks on and temp reduces to about 210F at idle, after the car has been run around awhile.

But I noticed that there's a very mild sort of "clacking sound" (probably not the greatest description) at this point, when the temp is up a full range. This occurs only as the engine is idling on its own. When I step on the throttle (sitting in the driveway), the sound disappears completely, then returns when back at idle.

This seems heat-related, ie, once the temp rises to where the main fan starts kicking in. Is this a normal sound? I don't really have this sound in my other vette. It should be noted I currently have quiet mufflers, so all engine sounds are easily heard.

Thanks!

 

[Mad-Mic]

could it be the injection?

 

[muddywaters]

sound/noise at idle

Hello and Welcome, I definetly hear my injectors after my 88' is warmed up, one in particular .

 

[Mad-Mic]

yeah i hear mine in my 87 and in my 82 Z/28 CFI car

tsht tsht tsht when you rev it i don't hear it just at idle

 

[bradvette]

Fuel injector(s) sounds reasonable to me, at what point do I know the 8 must be replaced? Or is the noise just something that can be ignored? Car has 62k miles on it.