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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
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