High pitched squeal in engine

you could have a vacum leak some where in the system that can cause high rpm,also if you have a bad tps(throttle position sensor) it can cause this type of problem.you don`t say if you have check to see what is turning on the check engine light and what code is in the computer.this should have been done and may have help to find the problem in the begining.

It could be a vacuum leak on the inlet manifold or pipes Start engine and allow it to idle, spray some wd 40 or similar around the inlet manifold & vacuum pipes, if you notice a change in engine speed when you spray you will have found the area of the leak

Need to check the ground path on the squealing relay. A poor ground will cause this condition.

The high pitch squeal ia most likely the serpentine belt on the front of the engine you can buy some belt dressing from the part store and put it on there and fix that or some soap will work also, the belt may also need to be tightened. As for the egg smell if it smells like eggs it's the catylitic converter doing it's job and is normal, although you should not be able to smell it inside the car when driving you may have an exhaust leak and could be very dangerous carbon monoxide exposure.

Brake pads are worn out. The ABS light would not come on because there is nothing wrong with the ABS. The grinding you are hearing are the brake pad backing plates rubbing against the rotor. You should have heard a high pitched squeal long before this happened. More than likely the rotors are now destroyed and will need replacing or at the very least turned in a machine shop. Fix this yesterday.

maybe its time to change the belts

My gas petal used to stick on the jeep so i spray up in there on the petal to stop it from sticking ore the brake light woud stay on becuse petal got stuck try some WD40 just dont sray on your petal ok might work

have Your alternator belt checked for the propper tension:]

what is wrong is that is the warning signal that it is time for a change of brake pads and an inspection of brake shoes

Have your egr valvle checked, if not operating properly it can cause engine 'pinging' which sounds like what u are describing. Let me know how it goes. countrycurt0