EMISSIDN GIJIITIIIILS EXIIAUST SYSTEMS 4A 5 S rvIc Dlaqnusls cnnllnundl Condition Possible Cause Correction MISFIRE AT ALL 1 Faulty spark plug s 1 Clean or replace spark plug s SPEEDS 2 Faulty spark plug cable s 2 Replace as necessary 3 Faulty distributor cap or rotor 3 Replace cap or rotor 4 Faulty coil 4 Test coil and replace as necessary 5 Primary circuit shorted or open 5 Trace primary circuit and repair intermittently as necessary 6 Leaking engine valve s 6 Check cylinder leakdown rate or compression and repair as necessary 7 Faulty hydraulic tappet s 7 Clean or replace tappet s 8 Faulty valve spring s 8 Inspect ancl test valve spring tension repair as necessary 9 Worn lobes on camshaft 9 Replace camshaft 10 Vacuum leak 10 Check manifold vacuum and repair as necessary 11 Improper carburetor settings 11 Adjust carburetor 12 Fuel pump volume or pressure 12 Replace fuel pump low 13 Blown cylinder head gasket 13 Replace gasket 14 Intake or exhaust manifold 14 Pass chain through passages passage s restricted POWER NOT UP 1 Incorrect ignition timing 1 Adjust timing TO NORMAL 2 Faulty distributor rotor 2 Replace rotor 3 Wom distributor shaft 3 Replace shaft 4 Incorrect spark plug gap 4 Adjust gap 5 Faulty fuel pump 5 Replace fuel pump 6 incorrect valve iimins 6 cheek valve timing and repair as necessary 7 Faulty Coil 7 Test coil and replace as necessary 8 Faulty is i i S Test cables and replace as necessary 9 Leaking engine valves 9 Check cylinder leakdown rate or compression and repair as necessary 10 Blown cylinder head gasket 10 Replace gasket 11 Leaking piston rings 11 Check compression and repair as necessary