Mazda 1975 Rotary Pickup Workshop Manual page 50

1 A
lA.C.
TROUBLE SHOOTING
1A-C-1.
Symptoms, Causes and Remedies
The possible faults and their remedies are listed in the following table. When the symptoms of troubles are de-
tected, proper care must be taken immediately.
(It would be better to check the ignition timing, spark plug and
idle setting at first)
Symptoms and probable causes Remedies
B.
c.
Poor accdsration and poor engine power.
*
The engine does not fully respond to the depression of the acceler-
ator Pedal.
*
The accelerative force is poor.
*
The climbing capacity is insufficient
*
The max. speed can not be obtained.
D.
E.
F.
G.
Defect of air intake system
1) Clogging of air cleaner
2) Defect of intake air temperature control valve
Defect of fuel system
L) Improper injection of carburetor accelerator pump
2) Clogging of carburetor jets
3) Improper opening of throtfle valve and choke valve
4) Lack of fuel supply at high speed nrnning
Defect of ignition system
L) Improper ignition timing and ignition advance
2) Defect of ignition control system (control unit, retard switch etc.)
3) Burned or improperly adjusted distributor contact point
4) Fouling and excessive gap of spark plugs
Air leak from each hose and each valve
Low compression pressure
Collapse of exhaust system
Defect of kick-down control system .... only in case of automatic trans-
missio.n
Rough en1f,ne idling and hard Starting
*
The idling speed cannot be lowered.
*
Too much engine vibration at idling.
*
The engine starting is too hard.
*
The engine stalls immediately even if it starts.
A. Defect of air intake system
1) Clogging of air cleaner
2) Defect of intake air temperature control valve
B. Defect of fuel system
1) Improper idle setting
2) Clogging of carburetor jets
3) Clogging of fuel return passage
4) Improper seating of carburetor secondary throtfle valve
5) Defect of choke system
C. Defect of ignition system
1) Improper ignition timing and ignition advance
2) Defect of ignition control system (control unit etc.)
3) Burned or improperly adjusted distributor contact point
4) Fouling and excessive gap of spark plugs
5) Internal disconnection of ignition coils
6) Electric leak from hightension cords, distributor, ignition coils etc.
D. Defect of deceleration control valve or improper signal from control unit
(Deceleration control valve is continuously o'pened.)
E. Defect of altitude compensator
F. Defect of evapo compensator valve
G. Defect of ventilation valve
z
Clean or replace
See 4-F-2
Repalce if necessarY
See 4-A-5
Adiust or replace
Clean or replace
Repair
See 4-B Replace if necessary
See 5-C-3, 5-C-5 Adjust
See 1A-A-8 Replace if necessary
See 5-C-1, 5-C-2 Adjust or.replace
See 5-E Clean or replace
Repair or reptace
Repair
Repair or replace
See 1A-A-10
Clean or replace
See 4-F-2
Replace if necessary
See 4-A-1. Adjust
Clean or replace
Clean or replace
Repair
See 4-A-4
Adjust
See 5-C-3, 5-C-5 Adjust
See 1A-A-8 Replace if necessary
See 5-C-1, 5-C-2 Adjust or replace
See 5-E Clean or replace
See 5-D Replace
Prepair
See 1A-A-5 Replace if necessary
See LA-A-6 Replace if necessary
See 1A-A-7
Replace if necessary
See 1A-A- 18 Replace if necessary
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