Rover 820 - Page 251

REF•12 Fault Finding
Engine (continued)
Engine misfires at idle speed
mm Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
mm Faulty spark plug HT leads (Chapter 1).
mm Incorrect ignition timing (Chapter 5).
mm Engine management system fault (Chapters 1 and 4).
mm Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 2 and 4).
mm Faulty hydraulic tappet(s) (Chapter 2, Part A, B or C).
mm Uneven or low cylinder compressions (Chapter 2, Part A, B or C).
mm Disconnected, leaking or perished crankcase ventilation hoses
(Chapters 1 and 4).
Engine misfires throughout the driving speed
range
mm Fuel filter choked (Chapter 1).
mm Fuel pump faulty or delivery pressure low (Chapter 4).
mm Fuel tank vent blocked or fuel pipes restricted (Chapter 4).
mm Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 2 and 4).
mm Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
mm Faulty spark plug HT leads (Chapter 1).
mm Faulty ignition coil (Chapter 5).
mm Engine management system fault (Chapters 1 and 4).
mm Uneven or low cylinder compressions (Chapter 2, Part A, B or C).
Engine hesitates on acceleration
mm Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
mm Engine management system fault (Chapters 1 and 4).
mm Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 2 and 4).
Engine stalls
mm Engine management system fault (Chapters 1 and 4).
mm Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 2 and 4).
mm Fuel filter choked (Chapter 1).
mm Fuel pump faulty or delivery pressure low (Chapter 4).
mm Fuel tank vent blocked or fuel pipes restricted (Chapter 4).
Engine lacks power
mm Incorrect ignition timing (Chapter 5).
mm Engine management system fault (Chapters 1 and 4).
mm Timing belt incorrectly fitted or incorrectly tensioned (Chapter 2,
Part A or B).
mm Fuel filter choked (Chapter 1).
mm Fuel pump faulty or delivery pressure low (Chapter 4).
mm Uneven or low cylinder compressions (Chapter 2, Part A, B or C).
mm Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
mm Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 2 and 4).
mm Brakes binding (Chapters 1 and 9).
mm Clutch slipping (Chapter 6).
mm Automatic transmission fluid level incorrect (Chapter 1).
Engine backfires
mm Ignition timing incorrect (Chapter 5).
mm Engine management system fault (Chapters 1 and 4).
mm Timing belt incorrectly fitted or incorrectly tensioned (Chap-
ter 2, Part A or B).
mm Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 2 and 4).
Oil pressure warning light illuminated with engine
running
mm Low oil level or incorrect oil grade (Chapter 1).
mm Faulty oil pressure warning light switch (Chapter 2, Part A, B or C).
mm Worn engine bearings and/or oil pump (Chapter 2, Part A, B or C).
mm High engine operating temperature (Chapter 3).
mm Oil pressure relief valve defective (Chapter 2, Part A, B or C).
mm Oil pick-up strainer clogged (Chapter 2, Part A, B or C).
Engine runs-on after switching off
mm Idle speed excessively high (Chapter 4).
mm Engine management system fault (Chapters 1 and 4).
mm Excessive carbon build-up in engine (Chapter 2, Part A, B or C).
mm High engine operating temperature (Chapter 3).
Engine noises
Pre-ignition (pinking) or knocking during acceleration or
under load
mm Ignition timing incorrect (Chapter 5).
mm Incorrect grade of fuel (Chapter 4).
mm Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 2 and 4).
mm Excessive carbon build-up in engine (Chapter 2, Part A, B or C).
Whistling or wheezing noises
mm Leaking inlet manifold gasket (Chapter 2, Part A, B or C).
mm Leaking exhaust manifold gasket or downpipe-to-manifold joint
(Chapters 1, 2 Part A, B or C, and 4).
mm Leaking vacuum hose (Chapters 1, 2, 4, and 9).
mm Blowing cylinder head gasket (Chapter 2, Part A, B or C).
Tapping or rattling noises
mm Faulty hydraulic tappet(s) (Chapter 2, Part A, B or C).
mm Worn valve gear or camshaft (Chapter 2, Part A, B or C).
mm Worn timing belt or tensioner (Chapter 2, Part A, B or C).
mm Ancillary component fault (water pump, alternator, etc) (Chapters 3
and 5).
Knocking or thumping noises
mm Worn big-end bearings (regular heavy knocking, perhaps less under
load) (Chapter 2, Part C).
mm Worn main bearings (rumbling and knocking, perhaps worsening
under load) (Chapter 2, Part C).
mm Piston slap (most noticeable when cold) (Chapter 2, Part C).
mm Ancillary component fault (water pump, alternator, etc) (Chapters 3
and 5).