Cylinder 4 misfire check engine light

SOURCE: MISFIRE CYLINDER #3 CHECK ENGINE LIGHT COMES ON VEHICLE

Check spark plug wires for corrosion

SOURCE: 2002 jeep cheroke misfires on cylinder #4

Check intake gasket and vecuum hoses near intake runner #4. To do this spray carb cleaner at parting line between manifold and block while engine is running. If leaking rpm will dramatically change. A leak will lean out that cyl and cause misfire

SOURCE: 1996 Jeep GC - Diagnostic tool identified cylinder misfire

P0300 Code - Random Misfire

Symptoms Symptoms may include:

• the engine may be harder to start
• the engine may stumble / stumble, and/or hesitate
• other symptoms may also be present

• Faulty spark plugs or wires
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector(s)
• Burned exhaust valve
• Faulty catalytic converter(s)
• Stuck/blocked EGR valve / passages
• Faulty camshaft position sensor
• Defective computer

SOURCE: I took my jeep in to the mechanic and he ran a

"(the #1 cylinder had only 0 pounds of pressure, they said they put oil on it (or in it) and the pressure increased to 25 psi, however it is supposed to run on 125 psi?) " is a test for bad rings,do get a 2nd opinion. sounds like a rebuild will be necessary.

SOURCE: check engine flashing engine misfire jeep

1st, replace your spark plugs(for gasoline engine) or heater plugs (for diesel engines)

if this does not work, have a mechanic check the timing of your engine. Engine timing is checked in the distributor, camshaft, and crankshaft.