Diagnostic Procedure 18 — Detonation
EF & EC-556flowchartSR20DET engine (per page header tab).
TROUBLE DIAGNOSES
Diagnostic Procedure 18 — Detonation
1
CHECK FOR INTAKE AIR LEAK. When pinching blow-by hose (lowering the blow-by air supply), does the engine rpm rise?
Yes
Discover air leak location and repair.
No
2
CHECK FOR OIL LEAK TO COMBUSTION CHAMBER. Remove spark plugs and check for fouling with oil.
No
INSPECTION END
Yes
3
Check pistons, piston rings, valves, valve seats, valve oil seal, engine oil level, etc.