I'm not sure but try this, turn the key with one hand (gently) while with the other hand try (hard) to turn the steering wheel one way then the other.
If they are collapsing after the engine is off, the rad cap is bad. The cap needs to allow pressure back in as the engine cools off.
Loose or worn out serpentine belt.
Bad sending unit in tank.
Pinched or blocked transmission cooling lines
No a Cherokee is a uni-body(frame is a part of the structure) and relies on all its components for structure in a situation such as an accident. You can make half doors / Tube doors that would allow for structural integrity.
The back of the ignition key cylinder is probably broken.
Battery, starter, fuel pump, ignition, computer,................
It could.
I would think not. The timimg belt correctly times the ignition to allow the engine to run. No spark would have to be a problem in the primary or secondary ignition system componets. However a broken timing belt would not allow the input of ignition componets due to lack of rotation.
Ignition is required for an engine to work. Failure of ignition would prevent the engine working.
You may have a short in the ignition system.
If they are collapsing after the engine is off, the rad cap is bad. The cap needs to allow pressure back in as the engine cools off.
the steering wheel..
Transmission trouble
The radio time would stay on if you had the keys in the ignition but the ignition was only turned halfway.
ignition module
ignition of food or cooking materials