98 chev blazer wont start or make any noises...

It came be a broking fly wheel do you hear any noise under truck then just may be a piston connect rod but not be care able to hear it all or this just a guess .

Check condition of tyres.
Also jack the vehicle up and spin each wheel, listening for a wheel bearing noise.
Another possibility might be either the differential or any drive shaft couplings.

I switched to Lucas oil with adding Lucas oil stabilizer and it increased my low oil pressure problem

it sound like a wheel bareing going on the blazer

check your fuel pressure it should be 55-61 psi with key on engine off.It should have a fitting on the fuel rail to hook a gauge up to.If below specs replace pump.

98 chev pickup s10 put gas in the gas tank drove it about 2days and the check engen light came on had it check mech said it was the gas cap replace the gas cap the light back on now what help

Brake Pads in bad condition, check it and replace.

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if the noise only happens when the vehicle is in motion...check the front suspension. place the jack under lower control arm ,then get a bar and lift up on the tire..ball joint issues are well known in blazers and cause this condition. if it does the rattle noise when its idling and to op temp--could be the cat converter causing the noise on pass side directly under passenger seat. when cold, smack the cat with rubber mallet and if any rattle is present, cat should be replaced so it dont cause further damage .hope that was helpful !!

Your air temp control blend door actuator is failing, that is the part u call a heater door, it is a gear driven miniature drive, the gears are jumping teeth making the noise, it will stop working very soon.

I was told by a mechanic in the family that it was the turn signal switch in the steering column. Part is around $400 if I put it in myself - I decided to live with it for now since the blinkers actually work - I am so used to the noise now, I hardly notice it anymore.