Tune-Up - 5.0l v8 VIN [s] Chevrolet Camaro II

VEHICLE IDENTIFICATION NUMBER CODE

Engine can be identified by the eighth digit of Vehicle Identification Number (VIN). The VIN is located on top left corner of instrument panel and is visible through windshield.

VIN ENGINE CODES

TUNE-UP NOTES

Note. When performing tune-up procedures described in this article, the following notes and precautions must be followed

With the exception of initial ignition timing, normal tune-up adjustments are not required. Perform specific adjustments only when indicated by the Computer Command Control (CCC) System Performance Check, CCC diagnostic charts and/or fuel system related poor engine performance. See appropriate article in Computerized Engine Controls section for diagnostic information.

Due to late changes and corrections, always refer to Engine Tune-Up Decal in engine compartment before attempting tune-up. If manual and decal specifications are different, always use specifications on Engine Tune-Up Decal.

Before making a compression test or cranking engine with a remote starting switch, disconnect ignition switch connector (pink wire) from High Energy Ignition (HEI) system distributor.

DO NOT remove spark plug wires with engine running. HEI ignition system secondary voltage is higher than standard ignition systems and may inflict harmful electrical shock.

Damage to HEI electronic module and/or ignition coil may result if "TACH" terminal in distributor cap connector is grounded.

ENGINE COMPRESSION

Test compression with engine warm, all spark plugs removed and throttle and choke valves wide open. Crank engine through at least four compression strokes.

COMPRESSION SPECIFICATIONS

VALVE CLEARANCE

VALVE CLEARANCE ADJUSTMENT

VALVE ARRANGEMENT

I-E-I-E-E-I-E-I (Front-to-Rear, both banks)

SPARK PLUGS

SPARK PLUG TYPE

SPARK PLUG INSTALLATION

HIGH TENSION WIRE RESISTANCE

Carefully remove ends of wire from spark plug and distributor. Using an ohmmeter, check resistance while gently twisting wire. If resistance is not to specification, or fluctuates, replace wire.

WIRE RESISTANCE

DISTRIBUTOR

All models are equipped with High Energy Ignition (HEI) systems with Electronic Spark Timing (EST) and no adjustments are required.

5.0L Firing Order & Timing Marks. Scheme 44

IGNITION TIMING

Note. Some engines are equipped with a receptacle for a magnetic probe timing meter, located 9.5° ATDC. DO NOT use this location for timing with a conventional timing light.

1. Place transmission in Neutral (man. trans.) or "P" (auto. trans.).
2. Place EST into by-pass mode by disconnecting single Tan/Black wire near right valve cover.
3. Connect timing light to No. 1 spark plug wire. Start engine and warm to normal operating temperature. Turn air conditioner off.
4. Adjust ignition timing by turning distributor housing. Recheck timing after tightening. Remove timing light and connect all wiring and vacuum hoses.

IGNITION TIMING SPECIFICATIONS

HOT (SLOW) IDLE RPM

Note. Idle speed is controlled by ECM. Idle adjustment is necessary only when the IAC or throttle body has been replaced. The procedure involves removal and disassembly of the throttle body. For throttle body removal and disassembly, refer to the GENERAL MOTORS ELECTRONIC FUEL INJECTION or the DIGITAL FUEL INJECTION article in FUEL SYSTEMS section.

Idle Speed Adjustment

1. Remove air cleaner and gaskets. Plug thermal vacuum port on rear of throttle body. Remove plug covering minimum air adjustment screw by making 2 hacksaw cuts as shown in Fig. (Scheme 45). Using a small punch, knock out portion of casting cut by hacksaw. Hit in direction indicated by arrow 1. Knock out steel plug with small punch by hitting plug from direction indicated by arrow 2.
2. Block drive wheels and apply parking brake. Connect a tachometer. Disconnect idle air control (IAC) electrical connectors. Plug idle air passages of each throttle body with Plugs (J-33047 or equivalent) making certain that plugs are fully seated and no air leaks exist. CAUTION: To prevent engine from running at high RPM, be sure ignition is off and transmission is in "N" before connecting IAC, or removing and installing idle air passage plugs. Failure to do this may result in vehicle movement.
3. Start engine and warm up to normal operating temperature. Place transmission in neutral (man. trans) or "D" (auto. trans.). Check that engine RPM decreases below curb idle speed. If RPM does not decrease, check for vacuum leak. Remove cap from ported tube on rear throttle body and connect water manometer (vacuum gauge). Adjust minimum air adjustment screw to obtain about 6" water on manometer. Remove manometer and install cap on ported tube.
4. Remove cap from ported tube on front throttle body and connect manometer. Reading should be again about 6" water. If adjustment is required, locate idle balance screw on throttle linkage. (Scheme 46) If screw is welded, break weld and install new screw with thread sealing compound. Adjust screw to obtain about 6" water on manometer. Remove manometer and install cap on ported tube.
5. Adjust minimum air adjustment screw on rear unit to obtain 4.75 RPM. Turn ignition off and place transmission in "N". Remove idle air passage plugs and reconnect idle aid control (IAC) assemblies. Start engine. Engine may run at high RPM but RPM will decrease when IAC assemblies close air passages. Stop engine when RPM decreases.
6. Check throttle position sensor (TPS) voltage. If adjustment is necessary, remove EGR valve and heat shield from engine. Using three 6" jumper wires, connect TPS harness to TPS. With ignition on and engine stopped, use a digital voltmeter to measure the voltage present between the terminals marked "B" and "C" on TPS.
7. Loosen 2 TPS attaching screws and rotate throttle position sensor to obtain a voltage reading of.45-.60 volts. Tighten screws. Turn ignition off, remove jumpers and reconnect TPS harness To TPS. Install EGR valve and heat shield to engine, using new gasket if necessary.
8. Install air cleaner gasket, connect vacuum line to throttle body and install air cleaner. Reset IAC motors by driving vehicle at 30 MPH.

Plug Removal for Minimum Air Adjustment Screw. Scheme 45

Component Locations for 5.0L Fuel Injection System. Scheme 46

IDLE MIXTURE ADJUSTMENT

Note. Idle mixture adjustment is not required on fuel injected models.

Cold (Fast) Idle RPM

Fast idle on the engine is controlled by the Electronic Control Module through the Idle Air Control (IAC) assembly. Adjustment of the fast idle is not possible.

FUEL PRESSURE TESTING

Make all tests at idle RPM. Connect pressure gauge to fuel line at throttle body.

FUEL PUMP PERFORMANCE

EMISSION CONTROL

See EMISSIONS section.

All models use a Delco-Remy High Energy Ignition with Electronic Spark Timing (HEI-EST).

IGNITION COIL RESISTANCE

PICK-UP COIL RESISTANCE

FUEL SYSTEM

GASOLINE FUEL INJECTION

ALTERNATOR

All models use a Delco-Remy SI alternator with integral regulator.

ALTERNATOR SPECIFICATIONS

ALTERNATOR REGULATOR

All models except 27SI use a Delco-Remy non-adjustable regulator, integral with alternator.

REGULATOR OPERATING VOLTAGE

BATTERY

BATTERY SPECIFICATIONS

STARTER

All models are equipped with a Delco-Remy solenoid actuated starter with overrunning clutch.

STARTER SPECIFICATIONS

SERVICING INTERVALS

REPLACEMENT INTERVALS

ADJUSTMENTS

BELT ADJUSTMENT (2)

CAPACITIES

COOLING SYSTEM CAPACITIES

ENGINE OIL & FUEL CAPACITIES

TRANSMISSION & DIFFERENTIAL CAPACITIES