My engine makes a loud metallic noise when it is cold and it diminishes as the the engines warms up. I changed my upstream 02 senor about two weeks ago and I added some stop leak to my radiator because it had a small leak. Could this be causing the problem? I didn't have any problem prior to changes.
have the same problem?
Tuesday, November 18th, 2008 AT 9:43 AM
Sounds like noisy valve lifters which bleed down a little bit while the car sits and pump back up as the engine warms. You could try an oil polymer additive to the oil and see if that helps quiet them down. The changes you have made would not have caused this. Also, radiator stop leak is just a "temporary" fix for a leak and is prone to plugging heater cores. Hope this helps.