Wait a minute! Slow down.
First of all where is the ticking noise coming from? Meaning, the top of the engine or the bottom or the front? When the engine is idleing does it make the same noise? Is the oil low?
Sometimes a ticking sound is just a worn out serpentine belt tention pulley or idler pulley. Or it may be a loose or damaged rocker arm, a bad valve spring, a bad oil pump. What is your oil pressure? If your pistons are blown then smoke will billow out the exaust pipes. Is this happening? If your exaust manifold is broken the noise will be unmistakably loud as if there was no muffler on the exaust pipe and your engine will miss fire realy bad. Is this happening?
Is the check engine light on? When you drive it is there a noticable loss of power? Did you do a compression test on the engine? If so what were the results?
P.S. Do not panic when you hear a loud ticking or rattling sound. Certainly do not change the engine because of this noise until you determine what the noise is, unless, of course, you have a lot of money to throw around. And in that case then why don't ya just buy a new Tahoe. Anyway--I'll be glad to help you with this problem so answer the above questions the best you can and I'll get back to you.
Saturday, December 22nd, 2007 AT 11:34 PM