Rattling Upon Acceleration

[bear]

Posted this in the UK site....now here:

Vehicle has a rattling noise upon acceleration (sounds like a loose heat shield)...could this be it? any other causes? Rattle is a deep rattle and happens for about 2 seconds while accelerating normally from dead stop or under load. Thanks in advance

[bear]

BTW....90 LS 400 w/112K dealer maintained including recent w/pump/t-belt.

[MistaG]

I am experiencing the exact same situation in my 1990 ls400. Can anybody tell me where the heat shield is located and secondly if it is a job that can be undertaken by a Newbie Do It Your Selfer such as myself....

Any advice is greatly appreciated

[SW03ES]

Do you JUST hear it upon acceleration, never under any other circumstances? Its possible that its a slight engine ping, sometimes this can be mistaken for something like a rattling heat shield. Try changing gas brands...

[MistaG]

I hear it especially for example, I am in the military and when I stop at the gate to check in my car is enclosed on both sides by walls and when initially take off under and minor to moderate acceleration I hear this rattling coming from underneath the car. I cannot hear it during Idling and I can only hear it at slow speeds... What so you think?

[SW03ES]

Well if thats the case then it probably is some sort of loose exhaust shield. If you can locate the loose shield then you should be able to secure it with a clamp by yourself.