Engine Controls - Adjustments: Other Mazda Protege BH

ENGINE MECHANICAL

Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.

VALVE CLEARANCE

Note. 1.8L vehicles are equipped with hydraulic lash adjusters. Valve clearance is not adjustable.

1.5L

1. Ensure engine is cold. Position No. 1 piston at TDC of compression stroke. Measure valve clearance between camshaft lobe and valve tappets at "A". (Scheme 3) If clearance is not within specification, replace adjustment shim. See «VALVE CLEARANCE SPECIFICATIONS TABLE»(ref-18557-S34143181102000123000000).
2. Turn crankshaft about 360° clockwise positioning No. 4 piston at TDC of compression stroke. Measure valve clearance between camshaft lobe and valve tappets at "B". (Scheme 3) If clearance is not within specification, replace adjustment shim. See «VALVE CLEARANCE SPECIFICATIONS TABLE»(ref-18557-S34143181102000123000000).

VALVE CLEARANCE SPECIFICATIONS

Scheme 3

IGNITION TIMING

Note. Before adjusting ignition timing, warm engine to normal operating temperature. Turn off all accessories. Place transmission in Neutral (M/T) or Park (A/T). Wait for cooling fan to stop. Ensure idle speed is correct. See IDLE SPEED under IDLE SPEED & MIXTURE.

1. Connect New Generation Star (NGS) Tool (49 T088 0A0) to data link connector 2 located under left side of dash. (Scheme 4) Using NSG tool, select PID/DATA MONITOR AND RECORD and monitor RPM. Connect Diagnostic Tool (49 B019 9A0) to data link connector. Set SYSTEM SELECT to position 1 and TEST SWITCH to SELF-TEST.
2. Connect timing light to high-tension lead No. 1. Set timing to specification. See «IGNITION TIMING SPECIFICATIONS TABLE»(ref-18557-S38396180672000123000000). (Scheme 5)
3. If ignition timing is not within specification, loosen distributor or camshaft position sensor lock bolt. Rotate distributor or camshaft position sensor until timing marks are aligned. Tighten lock bolt. On all models, disconnect NGS tool from data link connector 2 and diagnostic tool from data link connector.

Scheme 4

Scheme 5

IGNITION TIMING SPECIFICATIONS

IDLE SPEED & MIXTURE

Note. Idle mixture is not adjustable. If idle mixture is incorrect, see appropriate TESTS W/CODES article.

COLD (FAST) IDLE SPEED

Note. Fast idle speed is computer controlled. Adjustment is not necessary.

IDLE SPEED

Note. Before adjusting idle speed, warm engine to normal operating temperature. Turn off all accessories. Place transmission in Neutral (M/T) or Park (A/T). Wait for cooling fan to stop. DO NOT adjust idle using throttle adjusting screw. Throttle adjusting screw is preset and if adjusted, will adversely affect engine performance.

1. Connect New Generation Star (NGS) Tool (49 T088 0A0) to data link connector 2 located under left side of dash. (Scheme 4) Using NSG tool, select PID/DATA MONITOR AND RECORD and monitor RPM. Connect Diagnostic Tool (49 B019 9A0) to data link connector. Set SYSTEM SELECT to position 1 and TEST SWITCH to SELF-TEST.
2. If idle speed is not within specification, rotate air adjusting screw on throttle body. (Scheme 6) See «IDLE SPEED SPECIFICATIONS TABLE»(ref-18557-S27982428572000123000000). Disconnect NGS tool from data link connector 2 and diagnostic tool from data link connector.

Scheme 6

IDLE SPEED SPECIFICATIONS

THROTTLE POSITION (TP) SENSOR

Note. DO NOT adjust throttle adjusting screw. Throttle adjusting screw is preset and if adjusted, will adversely affect engine performance.

THROTTLE POSITION SWITCH

Note. Throttle position switch is part of TP sensor, which is adjusted automatically when TP sensor is adjusted. See THROTTLE POSITION (TP) SENSOR .