Diagnostic Procedure 20 — Backfire
EF & EC-122flowchartTROUBLE DIAGNOSES
Diagnostic Procedure 20 — Backfire
1
Check ignition system. • Check for operation. Refer to "Ignition Signal". (See page EF&EC-140).
N.G.
Repair or replace.
O.K.
2
1. Check spark gaps. • Turn ignition switch to "OFF". • Remove spark plugs. • Install new or good spark plugs. • While moving rear end of each spark plug close to grounding point, crank engine. • Check for sparks.
N.G.
Check ignition coil, power transistor and related circuits. Refer to "Ignition Signal". (See page EF&EC-140)
O.K.
3
Check spark plugs. • Remove spark plugs from engine and check for contaminants, damage and proper spark gaps.
N.G.
same as step 1
O.K.
4
Check spark plugs. • Stop engine. • Remove spark plugs and check for contaminants or damage. Also check spark gaps.
N.G.
same as step 1
O.K.
5
4. 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.
6
A (continues to next page)