CarTalk.com Blogs Car Info Our Show Deals Mechanics Files Vehicle Donation

2004 Jeep Wrangler Unlimited intermittent knock

engine makes knocking sound intermittently
sometimes it continues to a point where a screaming occurs
then it disappears
has not affected idle or acceleration

Did you have a question?
What engine? How many miles on it? How long has it been doing this? Are there any dash lights on? Has a mechanic looked at it yet?