Engine Controls - Adjustments: Other Suzuki X-90 I

ENGINE MECHANICAL

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

VALVE CLEARANCE

1. Remove valve cover. Align crankshaft pulley timing mark with TDC mark. (Scheme 4) Remove distributor cap. Ensure rotor is pointing to No. 1 terminal of distributor cap.
2. Check intake valve clearance of cylinders No. 1 and 2, and exhaust valve clearance of cylinders No. 1 and 3. See «VALVE CLEARANCE SPECIFICATIONS»(ref-26178-S13504505652001010500000) table. Turn crankshaft one complete revolution (360 degrees). Check intake valve clearance of cylinders No. 3 and 4, and exhaust valve clearance of cylinders No. 2 and 4.
3. Measure valve clearance between cam lobe and rocker using feeler gauge. Adjust valves by loosening lock nut and turning adjusting screw until clearance is as specified. Hold adjusting screw while tightening lock nut to 96-108 INCH lbs. (10-13 N.m). Recheck clearance.

Scheme 4

VALVE CLEARANCE SPECIFICATIONS

Scheme 5

IGNITION TIMING

Note. Verify that increasing engine speed advances ignition timing.

1. Ensure transmission is in Neutral or Park. Set parking brake. Inspect crankshaft pulley timing mark and timing mark indicator on timing belt cover. Clean marks as required. Start engine and allow it to reach normal operating temperature. Turn all accessories off. Attach timing light to No. 1 spark plug wire. Ensure idle speed is correct. See «IDLE SPEED SPECIFICATIONS»(ref-26178-S00368698842001010500000) table under IDLE SPEED & MIXTURE. CAUTION: Driving with jumper wire installed in test connector will damage catalytic converter.
2. Using a fused jumper wire, connect terminals "D" (ground) and "E" (test switch) of test connector. (Scheme 6) Aim timing light at timing cover timing marks. If ignition timing is not within specification, loosen distributor hold-down bolt and rotate distributor to obtain correct ignition timing. See «IGNITION TIMING»(ref-26178-S27076895572001010500000) table. Tighten distributor hold-down bolt and recheck ignition timing.

IGNITION TIMING (Degrees BTDC @ RPM) (1)

Scheme 6

PICK-UP COIL AIR GAP

Note. Vehicles use a Hall Effect ignition trigger. No gap adjustment is possible.

PICK-UP COIL AIR GAP (1)

IDLE SPEED & MIXTURE

Note. Mixture is not adjustable. Mixture is controlled by PCM based on various sensor inputs.

COLD (FAST) IDLE

Note. Fast Idle Air (FIA) valve is not adjustable. Air valve operation supplies by-pass air for cold idle.

IDLE SPEED

Note. DO NOT adjust idle speed in areas above 8200 ft. elevation.

IDLE SPEED SPECIFICATIONS (1)

IAC DUTY AT SPECIFIED IDLE SPEED (1)

1. Idle speed is controlled by IAC valve and should not require adjustment. If idle speed needs to be changed, start engine and allow it to reach normal operating temperature. Turn all accessories off. Ensure all fuel and emission control system wire connectors and hoses are properly connected. Ensure accelerator cable has free play. Ensure air cleaner and ducts are properly installed and air filter element is in good condition.
2. Ensure ignition timing is correct. See «IGNITION TIMING»(ref-26178-S27076895572001010500000) table under IGNITION TIMING. Using a fused jumper wire, connect terminal "B" (diagnosis switch) to terminal "D" (ground) at test connector. (Scheme 6) Attach a duty meter to duty output terminal "F" and ground terminal "D". Remove idle speed adjusting screw protective cap from top of throttle body. (Scheme 7) Turn idle speed adjusting screw to obtain correct idle RPM. See «IDLE SPEED SPECIFICATIONS»(ref-26178-S00368698842001010500000) and «IAC DUTY AT SPECIFIED IDLE SPEED»(ref-26178-S33220521592001010500000) tables.
3. On vehicles equipped with A/C, turn A/C switch to ON position. With A/C operating correctly, verify idle is 950-1050 RPM. If idle speed is not within specification, check A/C ON signal circuit. After adjustments, remove service wire and reinstall protective cap on throttle body. Recheck idle speed.

Scheme 7

THROTTLE POSITION (TP) SENSOR