Check your fan blade to be sure it is not hitting the radiator. Also your belts. Starting to think it may be something related to the belts or a wheel the belts go around. Maybe being able to pop the hood while hitting the gas may be helpful.
Did you try joining a blazer forum. There are two good ones. I have the address bookmarked at work but am off for two weeks. I found some good help there. People are really nice and there is a whole section for sounds.
Here's what we think may be wrong with your car and what may be causing it. The list goes from the most likely problem to the least likely. Check out our Product and How To pages or the Vehicle Repair Guide for your vehicle (if available) for more information about particular parts.
Keep in mind, this is a general diagnosis. Your car may not have the parts we list as potential problems. If you're not sure if your car has a particular part, check your owner's manual.
Also on autozone. Com there is free repair info. You have to register a screen name and at the bottom of the screen you will see a repair info link. Then there is a problem solving section where a selection is sounds like. Check a bunch. Howling to one person may be screeching to another.
I will keep brainstorming but may be something I have not
Sounds Like Change
Symptom: Grinding Change
When: Starting Engine Change
Where: Engine Compartment Change
Priority Action Part Type Cause
1 Inspect Starter Drive Faulty Starter Drive.
2 Inspect Starter Starter Motor Faulty.
3 Inspect Starter Shim Improper Flywheel/ Ring Gear Clearance.
4 Inspect Ring Gear (Manual Transmission) Worn, Damaged, or Faulty Ring Gear.
5 Inspect Flywheel (Automatic Transmission) Loose or Improperly TORQUED Flywheel.
6 Inspect Starter Broken or Faulty Wire Connection.
Sunday, September 13th, 2009 AT 8:32 PM