About 3-4 days ago my car started making a very loud noise, when i turn the ignition. and it's been going on since. it mainly happens when the engin is cold and gradually the noise fades away.at first i thought it might be oil. changed that but still there? some one mentioned glow plugs could that be it??
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if noise is only when starting, consider replacing the starter. the mounting bolts could have some loose, or the clutch which disengages the starter gear is not retracting the gear. either situation could cause a loud noise of the starter gear clattering with the ring gear.
my 2003 grand caravan 3.3l run for 30 then daying and fuel pump making noise you can restart again it run for 2 to 3 min dies again pep boys change crank sensor fuel pump no help when eng shutdown middle of high way or trafic no fuel to eng does have elect power no eng check light any help
Sounds like the alternator bearings have gone away, but, you need to physically check the source of the noise. (I can't do that from here). It also seems that you may have more than one problem going on there, possibly a bad ignition switch and also a blown fuse or bad body control module. As far as why the noise seems to be only when the engine is "freewheeling" may have a lot to do with rpm change and loading when in gear. I would go after the obvious alternator problem first, then sort out the remainder later.
The high pitch sound may come from the brake pads as metal parts hit the disc to signal the owner that it needs change. The metal parts gets exposed when the pads have worn out. The brake also has a hub to cover the disc. See if the metal plate is hitting it but this issue would appear when the wheels are in motion. Check if it is the belts, have the tension checked out. Other than that the bearings are the other items on your wheel that could cause a high pitched sound when you car is in motion.
It's not uncommon for a new belt to require re-tightening soon after it's been replaced. Check the belt for any excessive slack (shouldn't have more than 1/2 -3/4" ). A loose belt would be one possible cause for the loud noise you describe.
If you are hearing loud clicking, this is usually the starter silinoid. This part makes a loud clicking sound if the battery cannot supply enough amperage to operate the starter to turn over the engine. The battery must supply at least 80 to 100 Amps on a normal day to start the engine.
The battery can only be tested for amperage output with a load tester. The battery may be defective from age and use, or from the alternator going defective and damaging the battery.