Strange noise

[kwikgn1]

I was doing some tinkering on my 87 GN with 100,000 miles. It runs very well with some easy mods. With the car running, I noticed a bad-bearing type noise from the front of the engine. I replaced the belt tensioner bearing but that did not help. Is it possible that the cam sensor is making this noise? Any help would be appreciated.

 

[Phoneguy]

Remove the belt and start the car , this will eliminate accessories.

Bryan

 

[buickruss]

my original cam sensor would make a tapping sound especially when cold. started at about 70K miles. Use some vacuum line as a stethascope to rule out everything else in that area

 

[MaxVO2]

Assuming the accessories all check out ok from doing the belt removal trick - check your intercooler shroud and intercooler and see if it has shifted or gotten a bit loose and is banging a bit against the swaybar... I had this happen to me on my CAS stock mount and F-body front bar and it scared me half to death thinking I had a rod knock, bad timing chain, bad crank position sensor, etc.. The bracket had come loose and normal engine vibration caused a horrid sound that almost got me pulling the motor..

Hope it's something simple like this...

Billy

 

[KEVINS]

Water pump bearings will make a slight rattle noise when they start going out.

ks