�D - ADJUSTMENTS - 4-CYL EFI

�1989 Toyota 4Runner

1989 ENGINE PERFORMANCE Toyota 4-Cyl On-Vehicle Adjustments - Fuel Injection

Camry, Celica, Corolla, MR2, Pickup, Van & 4Runner

ENGINE COMPRESSION

Check compression pressure with engine at normal operatingtemperature. Unplug distributor and ignition coil. If equipped, unplugcold start injector connector, solenoid resistor, and fuel injectorconnectors. Remove all spark plugs, hold throttle valve wide open, andoperate engine at cranking speed.

COMPRESSION SPECIFICATIONS TABLE�������������������������������������������������������������������������������������������������������

SpecificationApplication psi (kg/cm

�

)

Corolla 4A-FE ................................ 191 (13.4) 4A-GE ................................ 178 (12.5)Pickup & 4Runner 22R-E ................................ 171 (12.0)All Others ............................ 178 (12.5)Minimum Compression Pressure Celica (3S-GTE) & Van ................. 128 (9.0) All Others ........................... 142 (10.0)Maximum Variation Between Cylinders ..... 14 (1.0)�������������������������������������������������������������������������������������������������������

VALVE CLEARANCE

NOTE: Van models are equipped with hydraulic lifters. No adjustment is necessary.

CAMRY, CELICA, COROLLA & MR2

1) With engine cold, remove valve cover. On Celica 3S-GTEmodels, throttle body must be removed prior to valve cover removal.See THROTTLE BODY article in N - REMOVE/INSTALL/OHAUL. 2) Rotate crankshaft pulley and align pulley groove with "0"mark on timing belt cover to set No. 1 cylinder at TDC of compressionstroke. Ensure rocker arms on cylinder No. 1 are loose and those oncylinder No. 4 are tight. If not, rotate crankshaft 360 degrees andrealign timing marks. 3) Measure and record intake valve clearance of cylinders No.1 and 2, and exhaust valve clearance on cylinders No. 1 and 3. SeeFig. 1. 4) Rotate crankshaft clockwise 360 degrees and align grooveon crankshaft pulley with the "0" mark or pointer on timing beltcover. With cylinder No. 4 at TDC, measure and record intake valveclearance on cylinders No. 3 and 4, and exhaust valve clearance oncylinders No. 2 and 4. See Fig. 1. Note if valve clearance is withinspecification. See VALVE CLEARANCE SPECIFICATIONS table in thisarticle. 5) To adjust valves, rotate crankshaft pulley to positionlobe upward on the valve to be adjusted. Use Valve Clearance Adjuster(SST 09248-55010) to press valve lifter downward.

CAUTION: Prior to pressing lifter downward, ensure adjustment shim notch area is toward the spark plug. See Fig. 2.

6) Press valve lifter downward using SST (A) and install SST(B) between camshaft and valve lifter and remove SST (A) See Fig. 2.Using a small screwdriver, remove adjustment shim. 7) Using a micrometer, measure thickness of shim justremoved. Select a new shim that will give correct valve clearance. SeeVALVE CLEARANCE SPECIFICATIONS table in this article. Shims areavailable in thickness from .0787" (2.000 mm) to .1299" (3.300 mm) forCelica 3S-GE and 3S-GTE models or .0984" (2.500 mm) to .1299" (3.300mm) for all other models in .002" (.05 mm) increments. 8) Install proper thickness shim. Using SST (A), pressdownward on valve lifter and remove SST (B). Recheck valve clearance.Install remaining components.

Fig. 1: Valve ArrangementCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 2: Removing Adjustment ShimCourtesy of Toyota Motor Sales, U.S.A., Inc.

PICKUP & 4RUNNER

1) Check and adjust valve clearance with engine at normaloperating temperature. Remove valve cover. Rotate crankshaft pulleyand align pulley groove with "0" mark on timing belt cover to set No.1 cylinder at TDC of compression stroke. 2) Ensure rocker arms on cylinder No. 1 are loose and thoseon cylinder No. 4 are tight. If not, rotate crankshaft 360 degrees andrealign timing marks. 3) Check and adjust intake valve clearance on cylinders No. 1and 2, and exhaust valve clearance on cylinders No. 1 and 3 tospecification. See VALVE CLEARANCE SPECIFICATIONS table in thisarticle. 4) Rotate crankshaft 360 degrees and realign timing marks.Adjust intake valve clearance on cylinders No. 3 and 4, and exhaustvalve clearance on cylinders No. 2 and 4.

VALVE CLEARANCE SPECIFICATIONS TABLE�������������������������������������������������������������������������������������������������������������������������������������������

Application (1) In. (mm)

Camry & Celica (W/3S-FE) Exhaust ...................................... .011-.015 (.28-.38) Intake ....................................... .007-.011 (.19-.29)Celica (W/3S-GE & 3S-GTE) & MR2 Exhaust ...................................... .008-.012 (.20-.30) Intake ....................................... .006-.010 (.15-.25)Corolla & MR2 Exhaust ...................................... .008-.012 (.20-.30) Intake ....................................... .006-.010 (.15-.25)Pickup & 4Runner Exhaust ............................................... .012 (.30) Intake ................................................ .008 (.20)

(1) - On Pickup and 4Runner models, adjust valves with engine at normal operating temperature. On all other models, adjust valves with engine cold.�������������������������������������������������������������������������������������������������������������������������������������������

IGNITION TIMING

CAUTION: Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tachometer to system. DO NOT allow tachometer terminal to become grounded or damage to ignitor and/or coil may exist.

1) Ensure engine is at normal operating temperature. Connecttiming light to engine. Connect tachometer to proper location. SeeFigs. 3-9. 2) Install jumper wire between proper terminals of enginecheck connector. See Figs. 10-16. Ensure idle speed is withinspecification. See IDLE SPEED SPECIFICATIONS table in this article.Note that base timing is within specification. See IGNITION TIMINGtable (Degrees BTDC @ RPM) in this article. Adjust timing by turningdistributor. 3) On Corolla 4A-FE models, disconnect the Air Control Valve(ACV) connector located near the cold start injector. See Fig. 17. 4) On all models, remove jumper wire from engine checkconnector and check that advance timing is within specification. SeeIGNITION TIMING table (Degrees BTDC @ RPM) in this article.

IGNITION TIMING TABLE (Degrees BTDC @ RPM)

�������������������������������������������������������������������������������������������������������������������������������������������

Application Base Timing Advance Timing

Camry & Celica 3S-FE .................... 10 @ 650 ................ 13-22 @ Idle 3S-GE & 3S-GTE ........... 10 @ 750 ................ 14-19 @ IdleCorolla 4A-FE .................... 10 @ 800 ......... More than 10 @ Idle 4A-GE .................... 10 @ 800 ......... More than 16 @ IdleMR2 ....................... 10 @ 800 ..... (1) More than 12 @ IdlePickup & 4Runner Pickup W/4WD & A/T ................... 5 @ 850 ................ 10-14 @ Idle All Others ................ 5 @ 750 ................ 10-14 @ IdleVan Auto. Trans. ............. 12 @ 750 ................... 20 @ Idle Man. Trans. .............. 12 @ 700 ................... 20 @ Idle

(1) - More than 16 degrees BTDC at idle on manual transaxle models.�������������������������������������������������������������������������������������������������������������������������������������������

Fig. 3: Tachometer Installation - Camry & Celica (3S-FE)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 4: Tachometer Installation - CorollaCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 5: Tachometer Installation - Celica (3S-GE & 3S GTE)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 6: Tachometer Installation - MR2Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 7: Tachometer Installation - 4RunnerCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 8: Tachometer Installation - VanCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 9: Tachometer Installation - Pick-UpCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 10: Engine Check Connector Jumper Wire Installation - CamryCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 11: Engine Check Connector Jumper Wire Installation - MR2Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 12: Engine Check Connector Jumper Wire Installation - CelicaCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 13: Engine Check Connector Jumper Wire Installation - Pick-UpCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 14: Engine Check Connector Jumper Wire Installation - CorollaCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 15: Engine Check Connector Jumper Wire Installation - VanCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 16: Engine Check Connector Jumper Wire Installation - 4RunnerCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 17: Disconnecting Corolla (4A-FE) Air Control ValveCourtesy of Toyota Motor Sales, U.S.A., Inc.

IDLE SPEED & MIXTURE ADJUSTMENT

NOTE: Mixture adjustment is NOT a part of normal tune-up procedure and should not be performed unless mixture control unit is

replaced or vehicle fails emissions testing.

NOTE: Adjust idle speed with air cleaner installed, all air intake system hoses and vacuum lines connected, EFI system wiring connectors tight, transmission/transaxle in Neutral, all accessories and cooling fan off (if equipped) and engine at normal operating temperature.

CAUTION: Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tachometer to system. DO NOT allow tachometer terminal to become grounded or ignitor and/or coil may be damaged.

CAMRY & CELICA (3S-FE)

1) Install tachometer to proper terminals. See Fig. 3.Install jumper wire between proper terminals of engine checkconnector. See Fig. 10 or 12. Operate engine at 1000-1300 RPM for 5seconds and return to idle speed. Note if idle speed is withinspecification. See IDLE SPEED SPECIFICATIONS table. 2) If idle speed requires adjustment, remove rubber boot fromtop of throttle body. See Fig. 18. Adjust idle speed adjusting screwto obtain correct idle speed. 3) Remove jumper wire and note idle speed. Idle speed shouldbe within specification. See IDLE SPEED SPECIFICATIONS table in thisarticle. If idle speed is not within specification, start engine andallow to idle for 30 seconds and then shut off. 4) Repeat procedure until idle data will be stored in theidle speed control and idle speed will be maintained. Removetachometer.

Fig. 18: Typical Idle Speed Adjusting LocationsCourtesy of Toyota Motor Sales, U.S.A., Inc.

CELICA (3S-GE)

1) Install tachometer to proper terminals. See Fig. 5. Startand operate engine at 2500 RPM for approximately 2 minutes. Allowengine to idle and pinch the No. 1 vacuum hose of air intake chamber

closed. See Fig. 19. Note if idle speed is within specification. SeeIDLE SPEED SPECIFICATIONS table in this article. 2) If idle speed requires adjustment, remove rubber boot fromtop of throttle body. See Fig. 18. Adjust idle speed adjusting screwto obtain correct idle speed. Remove tachometer.

Fig. 19: Celica (3S-GE) Air Intake Chamber Vacuum HoseCourtesy of Toyota Motor Sales, U.S.A., Inc.

CELICA (3S-GTE)

1) Install tachometer to proper terminals. See Fig. 5.Disconnect Idle Speed Control (ISC) valve connector at throttle body.See Fig. 20. 2) Start and operate engine. Idle speed should exceed 1000RPM. Reinstall ISC valve connector. Note if idle speed is withinspecification. See IDLE SPEED SPECIFICATIONS table. If idle speed isnot within specification, check the ISC valve, wiring and ECU. SeeIDLE SPEED CONTROL (ISC) SYSTEM under I - SYS/COMP TESTS in thissection. Remove tachometer.

Fig. 20: Disconnecting Celica (3S-GTE) ISC ValveCourtesy of Toyota Motor Sales, U.S.A., Inc.

VAN

1) Install tachometer to proper terminals. See Fig. 8.Disconnect Vacuum Switching Valve (VSV) connector for the idle speedcontrol valve. See Fig. 21. 2) Start and operate engine at 2500 RPM for approximately 2minutes. Note if idle speed is within specification. See IDLE SPEEDSPECIFICATIONS table. 3) If not within specification, rotate idle speed adjustingscrew to obtain an correct idle speed. Remove tachometer.

Fig. 21: VSV Connector For ISC Valve (Van)Courtesy of Toyota Motor Sales, U.S.A., Inc.

ALL OTHERS

1) Install tachometer to proper terminals. See Figs. 3 - 9.Start and operate engine at 2500 RPM for approximately 2 minutes. Noteif idle speed is within specification. See IDLE SPEED SPECIFICATIONStable in this article. 2) If idle speed requires adjustment, adjust idle speedadjusting screw to obtain an correct idle speed. Remove tachometer.

IDLE SPEED SPECIFICATIONS TABLE�������������������������������������������������������������������������������������������������������������������������������������������

Application Idle RPM

Camry ...................................................... (1) 650Celica 3S-FE ................................................ (1) 600-700 3S-GE ........................................................ 750 3S-GTE ................................................... 700-800Corolla 4A-FE & 4A-GE ................................................ 800MR2 ............................................................ 800Pickup & 4Runner 22R-E Pickup W/4WD & A/T .......................................... 850 All Others .................................................. 750Van Auto. Trans. ................................................. 750 Man. Trans. .................................................. 700

(1) - Idle speed with jumper wire removed is 650-750 RPM.�������������������������������������������������������������������������������������������������������������������������������������������

IDLE MIXTURE

NOTE: Idle mixture must be checked with air cleaner installed, all air intake system hoses and vacuum lines connected, EFI system wiring connectors tight, transmission/transaxle in Neutral, all accessories and cooling fan off (if equipped) and engine at normal operating temperature.

1) Ensure idle speed is within specification. Install jumperwire between proper terminals of check engine connector. See Figs. 10- 16. Connect positive (+) probe of voltmeter to terminal "VF" or"VF1" and negative (-) probe to terminal "E1". See Fig. 22. 2) Start engine and maintain engine RPM at 2500 RPM forapproximately 2 seconds. With engine RPM at 2500, count the amount oftimes that voltmeter fluctuates between the specified voltage. SeeIDLE MIXTURE TEST SPECIFICATIONS table in this article. 3) If the amount of fluctuations is less than the minimumamount, check for air leaks at the air induction system, defectiveairflow meter or throttle body. 4) If fluctuations were within specification, accelerate andhold engine at 2500 RPM for approximately 2 minutes. Install exhaustgas analyzer probe in tailpipe approximately 1.3 ft. at least. Waitone minute and check idle mixture readings. If readings are not withinspecification, see IDLE MIXTURE TROUBLE SHOOTING table in thisarticle.

Fig. 22: Voltmeter Installation For Checking Idle MixtureCourtesy of Toyota Motor Sales, U.S.A., Inc.

IDLE MIXTURE TEST SPECIFICATIONS TABLE�������������������������������������������������������������������������������������������������������������������������������������������

Model Voltage Minimum Fluctuations

Pickup & 4Runner 22R-E ....................... 0-7 ............. 6 Per 10 Seconds 3VZ-E ....................... 0-5 ............. 8 Per 10 SecondsVan ........................... 0-5 ............. 6 Per 10 SecondsAll Others .................... 0-5 ............. 8 Per 10 Seconds�������������������������������������������������������������������������������������������������������������������������������������������

IDLE MIXTURE TROUBLE SHOOTING TABLE�������������������������������������������������������������������������������������������������������������������������������������������

HC CO Problem Probable Cause

High . Normal .. Rough Idle ......... Incorrect Ignition Timing, Faulty Ign. Components, Incorrect Valve Clearance, Defective EGR Valve,

Leaking Intake/Exhaust Valves, Defective CylinderHigh .. Low .. Rough Idle (1) .................... Vacuum Leaks, Lean Mixture Causing MisfireHigh . High .. Rough Idle (2) ........... Restricted Air Filter, Plugged PCV, Faulty Pressure Regulator, Clogged Fuel Return Line, Defective Coolant Temp. or Air Temp. Sensor, ECU, Fuel Injector, Cold Start Injector, TPS, Airflow Meter

(1) - Fluctuating HC reading.(2) - Black smoke from exhaust.�������������������������������������������������������������������������������������������������������������������������������������������

THROTTLE POSITION SENSOR

CAMRY & CELICA

1) Loosen mounting screws. Unplug TPS connector. On Camrywith Electronically Controlled Transaxle (ECT) and Celica (3S-GE and3S-GTE), connect ohmmeter between terminals "IDL" and "E2". SeeFigs. 23 - 25. Insert .024" (.60 mm) feeler gauge between throttlestop screw and lever. 2) On Camry w/o ECT and Celica (3S-FE), connect ohmmeterbetween terminals "IDL" and "E1". Insert .028" (.70 mm) feeler gaugebetween throttle stop screw and lever. 3) On all models, with no continuity existing, rotate TPSclockwise until continuity exists. Tighten mounting screws. Usingspecified feeler gauge, recheck adjustment. See THROTTLE POSITIONSENSOR ADJUSTMENT table.

COROLLA, MR2, PICKUP, VAN & 4RUNNER

1) Loosen mounting screws. Unplug TPS connector. Connectohmmeter between terminals "IDL" and "E2" ("E1" on Van). 2) Install proper thickness feeler gauge between throttlestop screw and lever. On Corolla (4A-GE) and MR2, use .019" (.47 mm)feeler gauge. On Van, use .022" (.57 mm) feeler gauge. On all othermodels, use .028" (.71 mm) feeler gauge. See Figs. 24-26. 3) On all models, with no continuity existing, rotate TPSclockwise until continuity exists. Tighten mounting screws. Usingspecified feeler gauge, recheck adjustment. See THROTTLE POSITIONSENSOR ADJUSTMENT table.

THROTTLE POSITION SENSOR ADJUSTMENT TABLE�������������������������������������������������������������������������������������������������������������������������������������������

Clearance Between Lever Ohmmeter Reading& Stop Screw At Terminals "IDL" & (3) "E1" (Or "E2")

Camry & Celica With ECT (1) .020" (.50 mm) ....................................... Continuity .028" (.70 mm) .................................... No Continuity Without ECT (2) .020" (.50 mm) ....................................... Continuity .035" (.90 mm) .................................... No ContinuityCorolla (4A-FE) .020" (.60 mm) ........................................ Continuity

.032" (.80 mm) ..................................... No ContinuityCorolla (4A-GE) & MR2 .014" (.35 mm) ........................................ Continuity .023" (.59 mm) ..................................... No ContinuityPickup, Van & 4Runner .022" (.57 mm) ........................................ Continuity .033" (.85 mm) ..................................... No Continuity

(1) - Use these values on Celica 3S-GE and 3S-GTE engine.(2) - Use these values on Celica with 3S-FE engine.(3) - See D - ADJUSTMENTS for exact terminal identification.�������������������������������������������������������������������������������������������������������������������������������������������

Fig. 23: Adjusting TPS - Celica (3S-GE & 3S-GTE)Courtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 24: Adjusting TPS - Camry (3S-FE W/O ECT), Celica (3S-FE),Corolla (4A-FE) & VanCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 25: Adjusting TPS - Camry (3S-FE W/ECT), Pickup, & 4RunnerCourtesy of Toyota Motor Sales, U.S.A., Inc.

Fig. 26: Adjusting TPS - Corolla (4A-GE) & MR2Courtesy of Toyota Motor Sales, U.S.A., Inc.