bad oil pump spun a bearing low on oil
drop your oil pan and clean or change the oil pump screen and it should work...I had to do that and cleaned it with parts cleaner and now it works fine..they tend to clog after awhile.
transfer case
There are several things that can cause your 1993 Jeep Grand Cherokee driver information Center not to work. The most common cause is a blown fuse.
A cracked head could be the cause of the problem. This, along with a cracked head gasket would allow engine coolant to enter the oil supply. Coolant and oil do not mix well and over time, the oil looses its capability to lubricate. Check your oil for white spots and check your coolant reservoir for oil residue.
Most likely this is a problem with the blend doors. This is a very common failure on the GC Limited. You can get diagnostic information and a fix on the HeaterTreater web site. These guys are the experts. Follow my user name to my Bio Page for a link, or just search heatertreater on any search engine and you will get there eventually.
Cause low pressure oil pump
your oil pump is bad
The most common cause of lifters knocking is low oil pressure.
My 2000 Grand Prix would have a low-speed knocking noise coming from the drivers side as the CV axle was failing. The loss of lubrication in the CV Boots allows the joint to make a knocking/tapping sound at a low speed. If the knocking is coming from the engine compartment, then it could be an entirely different problem.
Loose converter bolts or a cracked pressure plate.
If it is the clutch and not the transmission. The face of the clutch disc may have come off. Dumping the clutch too often can cause this, or can "just happen". It may be packed against the bell housing and hitting the pressure plate. Pressure plate may have lost a spring when the clutch went and it is hitting. You will know when it is taken apart.
A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
Low oil or low oil pressure, bad oil pump, clogged or gummed up lifters or even thin oil can cause low oil pressure. All the possibilities mentioned can cause the engine to be starved of lubrication. Which in turn creates friction that heats the metal engine part so that their tolerances change. Change in tolerances between two parts can cause knocking with increased heat from this friction.
I would say you either have a rod knocking or lifter knocking. I know in the 3.8 litre motors they are known to knock alittle when you cold start them. Most Grand Ams, Grand Prixs are like this. My sister has a 2002 Grand Am that does this and the noise goes away once it's warmed up. I would also double check and make sure your oil is full. get your car to a garage for a def solution.
It may have lost oil pressure. Is the oil full? Insufficient oil is the most common but not the only cause of low oil pressure.
A fuel pressure problem.
bad fuel filter