Diagnostic Procedure 17 — Engine lacks power or stumbles
EF & EC-109flowchartDiagnostic Procedure 17 — Engine lacks power or stumbles
1
Check air intake for leaks. Start engine. Check to ensure engine speed increases when blow-by hose is pinched with fingers.
N.G.
Repair areas where air leaks.
O.K.
2
Check injectors. Stop engine. Remove distributor. (Do not remove crank angle sensor harness connector.) Remove power transistor connector. Turn ignition switch to 'ON'. Check to ensure each injector emits hissing sound when crankshaft is hand-rotated. Display shows an erratic indication during self-diagnosis and does not show abnormalities.
N.G.
Check injectors and circuits. Refer to 'Injector'. (See page EF&EC-153)
O.K.
3
Conduct power balance test. [CONSULT] Start engine. Conduct 'POWER BALANCE' test with 'ACTIVE TEST' showing on display. Test must be finished as quickly as possible. Do not conduct test while vehicle is being driven. Check to ensure idle speed momentarily decreases while testing each cylinder. [No CONSULT] Start engine. Check to ensure idle speed momentarily decreases when each injector connector is removed from cylinder.
N.G.
Go to 7
O.K.
4
A (continues to next page)