I recently bought a 1995 Bonneville SE..We had to repair a broken flywheel...Ok got that done...Now when the engine is running...it sounds like metal clanking together or something...When you give it gas...It quitens down...We cannot pinpoint the problem...My hubby has test drove it and says it runs smooth...We were just wondering what the sound could be? And how can we fix this...Any advice appreciated.......Thanks

The sound could be anywhere. You're going to have to narrow it down. We need more information, and can't even begin to guess. Right now, I'd put it somewhere under the hood

Does it do it hot? cold? In gear, or just park or neutral? Get a mechanic'* stethescope from the auto parts store and start trying to narrow down the location.

It does it when it is cold...When you first start it in park....To me..the sound sounds like it is located around where the belts are near the harmonic balancer...But it is to pinpoint exactly where it is...

Ok I just asked my husband where exactly the sound is coming from (he knows more about this that I do) He said it sounds like it is coming from the intake...Disreguard my "opinion" on it..LOL Shows what I can hear..LOL

Cold....near the intake? I'll go with lifter clatter.

sounds like lifter clatter to me too....my car does this for about 5 mins after startup.
sounds like tick tick tick tick (really fast)

Yea, mine does that too. However, the series 2 in that 95' is typically a lot quieter than the series 1. It seems that all series 1 have clatter.

I would check for the harmonic balancer. Turn the car off and see if you can rotate the pulleys back and forth a few inches with your hand.

Sometimes sounds are devious when trying to pin them down. A metal clanking sound is not usually associated with lifters. I have seen similar to this before. The flywheel was just replaced. Are the bolts tightened down properly. I have seen quite often that they come loose if not properly torques in (they can be tricky sometimes) This will make a metallic clatter at idle that is difficult to pinpoint and goes away when engine speed is increased. This is just another avenue to explore but I would definetely not overlook it.

Thanks to all that answered but we have found the problem...We think the block has cracked :( ...My hubby noticed a leak yesterday but couldn't figure where it was coming from...Got to looking at it again today...Still couldn't pinpoint it until he checked the oil...It was milky....So now, we will have to put another motor in it..Thank goodness we have a junkyard with quite a few of these motors in it....Wish us luck on getting this thing fix cause MOMMA NEEDS A NEW CAR!! LOL