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Auto Repair Troubleshooting Charts - Engine Performance
Get ideas about what your auto is needing to run it's best

Problem	Possible Cause	Remedy/Repair
Hard starting (Engine cranks normally)	Faulty engine control system component Faulty fuel pump Faulty fuel system component Faulty ignition coil Improper spark plug gap Incorrect ignition timing Incorrect valve timing	Repair or replace as necessary Replace fuel pump Repair or replace as necessary Test and replace as necessary Adjust gap Adjust timing Check valve timing; repair as necessary
Rough idle or stalling	Incorrect curb or fast idle spec Incorrect ignition timing Faulty EGR valve operation Faulty PCV valve air flow Faulty TAC vacuum motor or valve Air leak into manifold vacuum Faulty distributor rotor or cap Improperly seated valves Incorrect ignition wiring Faulty ignition coil Restricted air vent or idle passages Restricted air cleaner	Adjust curb or fast idle speed (if possible) Adjust timing to specification Test EGR system and replace as necessary Test PCV valve and replace as necessary Repair as necessary Inspect manifold vacuum connections and repair as necessary Replace rotor or cap (Distributor systems only) Test cylinder compression, repair as necessary Inspect wiring and correct as necessary Test coil and replace as necessary Clean passages Clean or replace air cleaner filter element
Faulty low speed operation	Restricted idle air vents and passages Restricted air cleaner Faulty spark plugs Dirty, corroded, or loose igniter secondary circuit wire connections Faulty ignition coil high voltage wire Faulty distributor cap	Clean air vents and passages Clean or replace air cleaner filter element Clean or replace spark plugs Clean or tighten secondary circuit wire connections Replace ignition coil high voltage wire (Distributor systems only) Replace cap (Distributor systems only)
Faulty acceleration	Incorrect ignition timing Faulty fuel system component Faulty spark plug(s) Improperly seated valves Faulty ignition coil	Adjust timing Repair or replace as necessary Clean or replace spark plug(s) Test cylinder compression, repair as necessary Test coil and replace as necessary
Faulty high speed operation	Incorrect ignition timing Faulty advance mechanism Low fuel pump volume Wrong spark plug air gap or wrong plug Partially restricted exhaust manifold, exhaust pipe, catalytic converter, muffler, or tailpipe Restricted vacuum passages Restricted air cleaner Faulty distributor rotor or cap Faulty ignition coil Improperly seated valve(s) Faulty valve spring(s) Incorrect valve timing Intake manifold restricted Worn distributor shaft	Adjust timing (if possible) Check advance mechanism and repair as necessary (Distributor systems only) Replace fuel pump Adjust air gap or install correct plug Eliminate restriction Clean passages Cleaner or replace filter element as necessary Replace rotor or cap (Distributor systems only) Test coil and replace as necessary Test cylinder compression, repair as necessary Inspect and test valve spring tension, replace as necessary Check valve timing and repair as necessary Remove restriction or replace manifold Replace shaft (Distributor systems only)
Misfire at all speeds	Faulty spark plug(s) Faulty spark plug wire(s) Faulty distributor cap or rotor Faulty ignition coil Primary ignition circuit shorted or open intermittently Improperly seated valve(s) Faulty hydraulic tappet(s) Faulty valve spring(s) Worn camshaft lobes Air leak into manifold Fuel pump volume or pressure low Blown cylinder head gasket Intake or exhaust manifold passage(s) restricted	Clean or replace spark plug(s) Replace as necessary Replace cap or rotor (Distributor systems only) Test coil and replace as necessary Troubleshoot primary circuit and repair as necessary Test cylinder compression, repair as necessary Clean or replace tappet(s) Inspect and test valve spring tension, repair as necessary Replace camshaft Check manifold vacuum and repair as necessary Replace fuel pump Replace gasket Pass chain through passage(s) and repair as necessary
Power not up to normal	Incorrect ignition timing Faulty distributor rotor Incorrect spark plug gap Faulty fuel pump Incorrect valve timing Faulty ignition coil Faulty ignition wires Improperly seated valves Blown cylinder head gasket Leaking piston rings	Adjust timing Replace rotor (Distributor systems only) Adjust gap Replace fuel pump Check valve timing and repair as necessary Test coil and replace as necessary Test wires and replace as necessary Test cylinder compression and repair as necessary Replace gasket Test compression and repair as necessary
Intake backfire	Improper ignition timing Defective EGR component Defective TAC vacuum motor or valve	Adjust timing Repair as necessary Repair as necessary
Exhaust backfire	Air leak into manifold vacuum Faulty air injection diverter valve Exhaust leak	Check manifold vacuum and repair as necessary Test diverter valve and replace as necessary Locate and eliminate leak
Ping or spark knock	Incorrect ignition timing Distributor advance malfunction Excessive combustion chamber deposits Air leak into manifold vacuum Excessively high compression Fuel octane rating excessively low Sharp edges in combustion chamber EGR valve not functioning properly	Adjust timing Inspect advance mechanism and repair as necessary (Distributor systems only) Remove with combustion chamber cleaner Check manifold vacuum and repair as necessary Test compression and repair as necessary Try alternate fuel source Grind smooth Test EGR system and replace as necessary
Surging (at cruising to top speeds)	Low fuel pump pressure or volume Improper PCV valve air flow Air leak into manifold vacuum Incorrect spark advance Restricted fuel filter Restricted air cleaner EGR valve not functioning properly	Replace fuel pump Test PCV valve and replace as necessary Check manifold vacuum and repair as necessary Test and replace as necessary Replace fuel filter Clean or replace air cleaner filter element Test EGR system and replace as necessary

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