1. GENERAL INFORMATION MYROAD 700i ENGINE LACKS POWER Inspection/Adjustment Symptom Probable Cause Connect the diagnostic tool, then check EMS and correct problems. Start engine and Clogged air cleaner accelerate lightly for Clogged exhaust muffler observation Faulty spark plug Faulty throttle Engine speed Engine speed does Faulty fuel pump increases not increase Faulty fuel injector sufficiently Improper valve timing Check ignition timing Low or no compression Correct timing Incorrect timing Faulty ECU Faulty CPS Check valve clearance Improper valve clearance Correct Incorrect adjustment Worn valve seat (valve stem too protruding Test cylinder compression Improper valve and seat contact Normal Abnormal Worn cylinder and piston rings compression compression Blown cylinder head gasket Flaws in cylinder head Check fuel injector for Improper valve timing clogging Not Clogged Clogged Fouled fuel injector Remove spark plug and inspect Plug not fouled or Plug fouled or Fouled spark plug discolored discolored Incorrect heat range plug Remove oil dipstick and check oil level and condition Oil level too high Correct and not Incorrect or Oil level too low contaminated contaminated Oil not changed Remove cylinder head bolts and inspect Valve train lubricated Valve train not Faulty oil pump properly lubricated properly Insufficient coolant Check if engine overheats Faulty thermostat Worn cylinder and piston rings Mixture too lean Engine does not Engine overheats Poor quality fuel overheats Excessive carbon buildup in combustion chamber Ignition timing too early Air in cooling system 1-24