Change engine oil and substitute one of the quarts of oil with one quart of automatic
Transmission Fluid. Run engine for 1000 miles. Change engine oil again with all oil.
If a lifter is stuck in the lifter bore and won't move, it has probably ruined the cam. The procedure would be to install a new cam and lifters.
Stuck hydraulic lifter.
im stuck and I need help
If it is stuck closed, the engine will overheat. If it is stuck open, the engine will take a long time to reach operating temp.
A clicking noise in the engine of a 91 Ranger could indicate a problem with the valves. A valve lifter in the engine may be worn or stuck.
It is on the left side of engine, but stuck in the intake manifold. That is you standing in the front of engine.
A stuck lifter is one that is gummed up with sludge. It is hydraulic and pumps oil. If it is sludged up, then it can't do what it is designed to do. Thus causing a tapping noise. Loud knock are either a rod, rod bearing, knock sensor, rocker arm, valvel spring, timing belt, or possibly just the belt tensioner. If it is a stuck lifter, the cheapest fix would be to run some engine flush in the engine, drain the oil and refill with good oil. If that works it was a stuck lifter. If not, Check with the most accessible first, pull the valve covers and check the rockers and valves. You may need to remove the intake first to access them. If it broke you will see it usually. If nothing is broke then go to the timing belt. Hope this helps.
the cheapest quick fix that works often is a can of engine flush before changing your oil and filter,pour in engine flush let car run 5 to 10 minutes with engine at idle then shut off engine and change oil you should hear lifter getting better during this process.
Check the engine thermostat. Its probably stuck open.
Oxygen sensor stuck lean.
Should still crank, but depending how it's stuck, it will run with a misfire/rough or could cause damage if the engine is an interference fit motor( I.E. the valves would hit the piston) or damage the camshaft.
A stuck lifter or loose connecting rod.