| Engine Lopes At Idle |
| Intake manifold-to-head leaks |
Replace manifold gasket, See ENGINES |
| Blown head gasket |
Replace head gasket, See ENGINES |
| Worn timing gears, chain or sprocket |
Replace gears, chain or sprocket |
| Worn camshaft lobes |
Replace camshaft, See ENGINES |
| Overheated engine |
Check cooling system, See COOLING |
| Blocked crankcase vent valve |
Remove restriction |
| Leaking EGR valve |
Repair leak and/or replace valve |
| Faulty fuel pump |
Replace fuel pump |
| Engine Has Low Power |
| Leaking fuel pump |
Repair leak and/or replace fuel pump |
| Excessive piston-to-bore clearance |
Install larger pistons, See ENGINES |
| Sticking valves or weak valve springs |
Check valve train components, See ENGINES |
| Incorrect valve timing |
Reset valve timing, See ENGINES |
| Worn camshaft lobes |
Replace camshaft, See ENGINES |
| Blown head gasket |
Replace head gasket. See ENGINES. |
| Clutch slipping |
Adjust pedal and/or replace components, See ENGINES |
| Engine overheating |
Check cooling system, See COOLING |
| Auto. Trans. pressure regulator valve faulty |
Replace pressure regulator valve |
| Auto. Trans. fluid level too low |
Add fluid as necessary |
| Improper vacuum diverter valve operation |
Replace vacuum diverter valve |
| Vacuum leaks |
Inspect vacuum system and repair as required |
| Leaking piston rings |
Replace piston rings, See ENGINES |
| Faulty High Speed Operation |
| Low fuel pump volume |
Replace fuel pump |
| Leaking valves or worn |
Replace valves and/or springs, See ENGINES |
| Incorrect valve timing |
Reset valve timing,See ENGINES |
| Intake manifold restricted |
Remove restriction |
| Worn distributor shaft |
Replace distributor |
| Faulty Acceleration |
| Improper fuel pump stroke |
Remove pump and reset pump stroke |
| Incorrect ignition timing |
Reset ignition timing, See TUNE-UP |
| Leaking valves |
Replace valves, See ENGINES |
| Worn fuel pump diaphragm or piston |
Replace diaphragm or piston |
| Intake Backfire |
| Improper ignition timing |
Reset ignition timing, See TUNE-UP |
| Faulty accelerator pump discharge |
Replace accelerator pump |
| Improper choke operation |
Check choke and adjust as required |
| Defective EGR valve |
Replace EGR valve |
| Fuel mixture too lean |
Reset air/fuel mixture, See TUNE-UP |
| Choke valve initial clearance too large |
Reset choke valve initial clearance |
| Exhaust Backfire |
| Vacuum leak |
Inspect and repair vacuum system |
| Faulty vacuum diverter valve |
Replace vacuum diverter valve |
| Faulty choke operation |
Check choke and adjust as required |
| Exhaust system leak |
repair exhaust system leak |
| Engine Detonation |
| Ignition timing too far advanced |
Reset ignition timing, See TUNE-UP |
| Faulty ignition system |
Check ignition timing, See TUNE-UP |
| Spark plugs loose or faulty |
Retighten or replace plugs |
| Fuel delivery system clogged |
Inspect lines, pump and filter for clog |
| EGR valve inoperative |
Replace EGR valve |
| PCV system inoperative |
Inspect and/or replace hoses or valve |
| Vacuum leaks |
Check vacuum system and repair leaks |
| Excessive combustion chamber deposits |
Remove built-up deposits |
| Leaking, sticking or broken valves |
Inspect and/or replace valves |
| External Oil Leakage |
| Fuel pump improperly seated or worn gasket |
Remove pump, replace gasket and seat properly |
| Oil pan gasket broken or pan bent |
Straighten pan and replace gasket |
| Timing chain cover gasket broken |
Replace timing chain cover gasket |
| Rear main oil seal worn |
Replace rear main oil seal |
| Oil pan drain plug not seated properly |
Remove and reinstall drain plug |
| Camshaft bearing drain hole blocked |
Remove restriction |
| Oil pressure sending switch leaking |
Remove and reinstall sending switch |
| Excessive Oil Consumption |
| Worn valve stems or guides |
Replace stems or guides, See ENGINES |
| Valve "O" ring seals damaged |
Replace "O" ring seals, See ENGINES |
| Plugged oil drain back holes |
Remove restrictions |
| Improper PCV valve operation |
Replace PCV valve |
| Engine oil level too high |
Remove excess oil |
| Engine oil too thin |
Replace thicker oil |
| Valve stem oil deflectors damaged |
Replace oil deflectors |
| Incorrect piston rings |
Replace piston rings, See ENGINES |
| Piston ring gaps not staggered |
Reinstall piston rings, See ENGINES |
| Insufficient piston ring tension |
Replace rings, See ENGINES |
| Piston ring grooves or oil return |
slots clogged Replace piston rings, See ENGINES |
| Piston rings sticking in grooves |
Replace piston rings, See ENGINES |
| Piston ring grooves excessively worn |
Replace piston and rings, See ENGINES |
| Compression rings installed upside down |
Replace compression rings correctly, See ENGINES |
| Worn or scored cylinder walls |
Rebore cylinders or replace block |
| Mismatched oil ring expander and rail |
Replace oil ring expander and rail, See ENGINES |
| Intake gasket dowels too long |
Replace intake gasket dowels |
| Excessive main or connecting rod bearing clearance |
Replace main or connecting rod bearings, See ENGINES |
| No Oil Pressure |
| Low oil level |
Add oil to proper level |
| Oil pressure sender or gauge broken |
Replace sender or gauge |
| Oil pump malfunction |
Remove and overhaul oil pump, See ENGINES |
| Oil pressure relief valve sticking |
Remove and reinstall valve |
| Oil pump passages blocked |
Overhaul oil pump, See ENGINES |
| Oil pickup screen or tube blocked |
Remove restriction |
| Loose oil inlet tube |
Tighten oil inlet tube |
| Loose camshaft bearings |
Replace camshaft bearings, See ENGINES |
| Internal leakage at oil passages |
Replace block or cylinder head |
| Low Oil Pressure |
| Low engine oil level |
Add oil to proper level |
| Engine oil too thin |
Remove and replace with thicker oil |
| Excessive oil pump clearance |
Reduce oil pump clearance, See ENGINES |
| Oil pickup tube or screen blocked |
Remove restrictions |
| Main, rod or cam bearing clearance excessive |
Replace bearing to reduce clearance, See ENGINES |
| High Oil Pressure |
| Improper grade of oil |
Replace with proper oil |
| Oil pressure relief valve stuck closed |
Eliminate binding |
| Oil pressure sender or gauge faulty |
Replace sender or gauge |
| Noisy Main Bearings |
| Inadequate oil supply |
Check oil delivery to main bearings |
| Excessive main bearing clearance |
Replace main bearings, See ENGINES |
| Excessive crankshaft end play |
Replace crankshaft, See ENGINES |
| Loose flywheel or torque converter |
Tighten attaching bolts |
| Loose or damaged vibration damper |
Tighten or replace vibration damper |
| Crankshaft journals out-of-round |
Re-grind crankshaft journals |
| Excessive belt tension |
Loosen belt tension |
| Noisy Connecting Rods |
| Excessive bearing clearance or missing bearing |
Replace bearing, See ENGINES |
| Crankshaft rod journal out-of-round |
Re-grind crankshaft journal |
| Misaligned connecting rod or cap |
Remove rod or cap and realign |
| Incorrectly tightened rod bolts |
Remove and re-tighten rod bolts |
| Noisy Pistons and Rings |
| Excessive piston-to-bore clearance |
Install larger pistons, See ENGINES |
| Bore tapered or out-of-round |
Rebore block |
| Piston ring broken |
Replace piston rings, See ENGINES |
| Piston pin loose or seized |
Replace piston pin, See ENGINES |
| Connecting rods misaligned |
Realign connecting rods |
| Ring side clearance too loose or tight |
Replace with larger or smaller rings |
| Carbon build-up on piston |
Remove carbon |
| Noisy Valve Train |
| Worn or bent push rods |
Replace push rods, See ENGINES |
| Worn rocker arms or bridged pivots |
Replace push rods, See ENGINES |
| Dirt or chips in valve lifters |
Remove lifters and remove dirt/chips |
| Excessive valve lifter leak-down |
Replace valve lifters, See ENGINES |
| Valve lifter face worn |
Replace valve lifters, See ENGINES |
| Broken or cocked valve springs |
Replace or reposition springs |
| Too much valve stem-to-guide clearance |
Replace valve guides, See ENGINES |
| Valve bent |
Replace valve, See ENGINES |
| Loose rocker arms |
Retighten rocker arms, See ENGINES |
| Excessive valve seat run-out |
Reface valve seats, See ENGINES |
| Missing valve lock |
Install new valve lock |
| Excessively worn camshaft lobes |
Replace camshaft, See ENGINES |
| Plugged valve lifter oil holes |
Eliminate restriction or replace lifter |
| Faulty valve lifter check ball |
Replace lifter check ball, See ENGINES |
| Rocker arm nut installed upside down |
Remove and reinstall correctly |
| Valve lifter incorrect for engine |
Remove and replace valve lifters |
| Faulty push rod seat or lifter plunger |
Replace plunger or push rod |
| Noisy Valves |
| Improper valve lash |
Re-adjust valve lash, See ENGINES |
| Worn or dirty valve lifters |
Clean and/or replace lifters |
| Worn valve guides |
Replace valve guides, See ENGINES |
| Excessive valve seat or face run-out |
Reface seats or valve face |
| Worn camshaft lobes |
Replace camshaft, See ENGINES |
| Loose rocker arm studs |
Re-tighten rocker arm studs, See ENGINES |
| Bent push rods |
Replace push rods, See ENGINES |
| Broken valve springs |
Replace valve springs, See ENGINES |
| Burned,Sticking or Broken Valves |
| Weak valve springs or warped valves |
Replace valves and/or springs, See ENGINES |
| Improper lifter clearance |
Re-adjust clearance or replace lifters |
| Worn guides or improper guide clearance |
Replace valve guides, See ENGINES |
| Out-of-round valve seats or improper seat width |
Re-grind valve seats |
| Gum deposits on valve stems, seats or guide |
Remove deposits |
| Improper spark timing |
Re-adjust spark timing |
| Broken Pistons/Rings |
| Undersize pistons |
Replace with larger pistons, See ENGINES |
| Wrong piston rings |
Replace with correct rings, See ENGINES |
| Out-of-round cylinder bore |
Re-bore cylinder bore |
| Improper connecting rod alignment |
Remove and realign connecting rods |
| Excessively worn ring grooves |
Replace pistons, See ENGINES |
| Improperly assembled piston pins |
Re-assemble pin-to-piston, See ENGINES |
| Insufficient ring gap clearance |
Install new rings, See ENGINES |
| Engine overheating |
Check cooling system |
| Incorrect ignition timing |
Re-adjust ignition timing, See TUNE-UP |
| Excessive Exhaust Noise |
| Leaks at manifold to head, or to pipe |
Replace manifold or pipe gasket |
| Exhaust manifold cracked or broken |
Replace exhaust manifold, See ENGINES |
