compression ratio MAZDA MX-5 1994 User Guide

TROUBLESHOOTING GUIDE INSPECTION :heck for correct ignition timing at idle page F-76 gnition timing: 10" .t lo BTDC ;heck if spark plugs are OK RBON BUILDUP PLUG GAP 1 .O-l.lmrn b.040--0.043 in} DAMAGE AND DETERIORATION DAMAGE :heck if resistance of high-tension leads are OK lesistance: 16 k!2 per 1 m (3.28 ft) :heck if resistance of ignition coil is OK Section G lesistance (at 20°C (66°F)): Secondary coil ... 8.7-12.9 'heck for correct engine compression Section B ngine compression: 1,255483 kPa (12.8-9.0 kgf/cm2, 182-128 psiE.300 rpm Yes No Yes No - Yes Yes No - Yes - No ACTION Check if ignition timing advances when accelerating s, If advances, go to next step +, If no advance, replace PCME terminal voltages page F-143 Adjust page F-76 Go to next step Repair, clean, or replace us Section G Go to next step Replace w Section G Go to next step Replace Section G 30 to next step Zheck engine condition w Section B D Worn piston, piston rings or cylinder wall D Defective cylinder head gasket Distorted cylinder head Improper valve seating B Valve sticking in guide Gartner Banana

TROUBLESHOOTING GUIDE TROUBLESHOOTING HINTS] D Factors other than engine malfunction Clutch slipping Brake dragging Low tire pressure Unrecommended tire size 25 O AirIFuel mixture too lean or too rich Fuel line pressure low or high Insufficient fuel injection @ Poor ignition 6 Low engine compression POOR ACCELERATION Overloaded D Low intake air amount Throttle valve not open fully Clogged intake air system )ESCRIPTION I Performance poor while accelerating INSPECTION :heck factors other than engine Clutch slipping Section H D Brake dragging Section P t Low tire pressure Section Q D Unrecommended tire size Section Q :heck if throttle valve wide open throttles when jepressing accelerator fully Check if "00" is displayed on Self-Diagnosis Check- er with ignition switch ON page F-79 Check switches for correct operation with Self- Diagnosis Checker Monitor Lamp and ignition switch ON page F-95 SELECT SW A SYSTEM SELECT 1 - Yes - No Yes - No - Yes - No Yes - No ACTION Go to next step Repair Go to next step Check if accelerator cable is correctly installed * page 0 If OK, check throttle body ce Page 0 If not OK, install accelerator cable correctly page Go to next step -- Diagnostic Trouble Code No. displayed Check for cause (Refer to specified check sequenc US page "88" flashes Check PCME terminal 1 E voltage Us Page Specification: Battery positive voltage (Ignition switch ON) 0 If OK, replace PCME * Page 9 If not OK, check wiring between PCME and Self- sis Checker * Page Go to next step Lamp not ONlOFF with specified switch Check for cause (Refer to specified check sequenc * Paw Lamp always ON Check wiring between PCME terminal 1 D and Self nosis Checker * Page ! F-103 ! F-101 I F-103 :e) r F-81 ! F-145 I F-143 Diagno- ! F-7 :e) ! F-96 -Diag- ! F-7 Gartner Banana

TROUBLESHOOTING GUIDE INSPECTION Check for correct ignition timing at idle t@= page F-76 Ignition timing: 10" +. lo BTDC Check if spark plugs are OK WEAR AND CARBON BUILDUP BURNS PLUG GAP 1 .+I .I mm (0.04C-O.043 in) DAMAGE AND DETERIORATION DAMAGE Check if resistance of high-tension leads are OK Resistance: 16 kR per lm {3.28 ft} Check if resistance of ignition coil is OK Section G Resistance (at 20°C {68"F)): Secondary coil ... 8.7-12.9 kC2 Check for correct engine compression Section 8 Engine compression: 1,255-883 kPa (12.8-9.0 kgf/cm2, 182-128 psi)-300 rpm :heck for correct intake manifold vacuum at idle Vacuum: More than 450 mmHg (17.7 inHg) - Yes - No Yes - No - Yes - No - Yes - No - Yes - No - Yes ACTION Check if ignition timing advances when accelerating o If advances, go to next step o If no advance, replace PCME page F-143 Adjust page F-76 Go to next step Repair, clean, or replace Ojp Section G Go to next step ~eplace as? Section G Go to next step Replace Section G - -- Go to next step :heck engine condition I@= Section B B Worn piston, piston rings or cylinder wall B Defective cylinder head gasket B Distorted cylinder head B Improper valve seating B Valve sticking in guide Check for air leakage of intake air system components as? page F-1 00 Gartner Banana

TD TECHNICAL DATA A. MEASUREMENTS I Item I Measurements I B. ENGINE Overall length mm {in) Overall width mm (in) Overall height mm {in) Wheelbase mm {in) 3,948 (1 55.4) 1,676 i65.9) 1,224 I48.2) 2,266 I89.2) 1,410 (55.5) 1,428 (56.2) Tread - ltem Tvoe u Front mm (in) Rear mm {in) BP DOHC Gasoline. 4-cvcle . In-line, 4-cylinders Pentroof DOHC, belt-driven 16 valves 83.0 x 85.0 {3.27 x 3.35) 1,840 (1,840, 11 2) 9.0 1,255 {I 2.8, 1823-300 883 (9.0, 1281-300 196 {2.0, 28) s. Cylinder arrangement and number Combustion chamber Valve system Bore x Stroke mm {in] Total piston displacement ml {cc, cu in) Compression ratio Valve timing Compression pressure kPa (kgflcm2. psil-r~m I Valve and valve auide I Standard Minimum Maximum difference between each cvlinder - - IN openz (BTDCO) Close (ABDCO) Open (BBDCO) EX close (ATDC") Valve clearance mm {in) Cylinder head 5 48 56 14 IN 133.8-1 34.0 i5.268-5.275) 0.1 0 {0.004) max. 0.10 {0.004) max. 0.02G0.066 {0.0010-0,0025) 0.18 {0.0071) Height mm (in) Distortion mm {in) Grinding mm {in) - 0: Maintenance-free Cylinder head-to-HLA clearance mm (in} Valve head diameter mm Iin) Valve head margin thickness mm {in} Valve face angle I Valve seat 1 u Standard Maximum Valve length mm {in) EX IN EX IN EX IN EX Standard Minimum Standard Minimum IN EX IN EX 5.99--6.03 iO.2359--0.2374) 0.005--0.060 (0.0002-0.0023) 0.01 b0.065 (0.0004-0,0025) 0.20 {0.008} 18.3-1 8.9 {0.7214.744) 18.3-1 8.9 (0.721-0.744) Guide inner diameter mm (in) 0: Maintenance-free 32.9-33.1 {I .296--1.303) 27.85-28.15 {I .097-1 .I 08) 0.9 {0.035) 1 .O (0.039) 45" 45" 101.89 {4.0114} 100.39 {3.9524) 101.99 (4.0153) 100.49 (3,9563) 5.970-5.985 {0.2351-0.2356) 5.96G5.980 l0.2349-0.2354) Valve stem diameter mm {in) Valve stem-to-guide clearance mm (in) Guide projection (Height "A) mm {in) Seat angle IN EX Maximum IN EX IN 45" EX 45" Gartner Banana