Some engines may experience a brief knocking or rattle on cold start up. Our technicians tell us replacing the camshaft timing gear assembly with upgraded parts will generally correct this concern.Google+
Car Problem Reports
Scion xD Brief Knocking or Rattle on Cold Start Up
Scion xD Problem
Average Mileage: 48,750 mi (40,000 mi - 60,000 mi)
Visitor, 2008 Scion xD, 50,000 mi
Same problem. Brief rattle/grinding sound on cold start. Has been going on intermittently for last 2 years. Started at about 20K miles but live in Florida so issues is almost non existant 5 months out of the year but progressivly getting worse. At the dealer today. Could not find anything when my daughter mentioned it on a routine service a couple years back but I have a little more information this time.
I bought this car used with 32000 on it. The first problen was a vibration at about 3K rpm during shifting from 2nd to 3rd gear. This was corrected by the dealer by repacing the water pump under warrenty. My next problem is a dry start that is more pronouced when car is parked in nose down position. In fact if car is in nose up position codition is fixed. This dry start is the same knocking that you hear after an oil change. Is it possible that the fix is covered on my remaining powertrain warrenty. This is a follow on report to this problem, I started using 93 octane gas and wouldn,t you know the knocking has stopped. my mechanic told me this can only be caused my preingition causing what is called piston rattle. this is the only way the higher octane gas can make a differance.
Visitor, 2008 Scion xD, 45,000 mi
Brief knocking sound on cold startup.