Tapping @ Idle?

[MorePower7701]

I have a Jasper 1990 4.0 engine with about 3000 miles on it. The engine makes a tapping sound at idle, but does not seem to get worse when the RPMs increase. Does these engines tap even when they have low miles, or is it something that I should worry about?

Thanks

 

[Stranger ranger]

its probably your injectors

 

[Nhaz]

My injectors are loud enough at idle that they can be heard clearly. They sound like a tapping valve. I isolated it by using the good old screwdriver in the ear trick and it was the injectors.

 

[canyoncritter]

injectors, or the rocker arms being worn are the two most common "ticking" sounds from the 4.0l.