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Engine Controls - Adjustments Chevrolet Caprice Impala SS

Adjustments ~271 words

ENGINE MECHANICAL

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

VALVE CLEARANCE

Note. All models use hydraulic lifters. Adjustments are not required.

IGNITION TIMING

Note. Procedures for timing adjustment are for engines equipped with HEI-EST distributors only. Other engines are equipped with C(3)I, DIS, IDI or Opti-Spark ignition system. Timing on these systems is not adjustable.

IDLE SPEED & MIXTURE

Note. Idle mixture is controlled by Powertrain Control Module (PCM). Adjustment is not possible.

CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

IDLE SPEED

Note. On 4.3L and 5.7L, idle speed is controlled by PCM. Slight fluctuations in idle speed are considered normal. Adjustment is not required. Refer to IAC VALVE RESET procedure below.

IAC Valve Reset

Idle speed is PCM-controlled. Resetting of IAC valve pintle is the only adjustment that can be performed. To reset IAC valve pintle position, depress accelerator pedal slightly. Start engine, and release accelerator pedal. Run engine for 5 seconds. Turn engine off for 10 seconds. Restart engine, and check for proper idle operation.

IDLE MIXTURE

Note. Idle mixture is controlled by Powertrain Control Module (PCM). Adjustment is not required or possible.

THROTTLE POSITION SENSOR

Note. V8 engine TP sensor is not adjustable. For further testing procedures, refer to TESTS W/CODES or SYSTEM/COMPONENT TESTING article in this section.

  1. «TESTS W/CODES - 4.3L»(/chevrolet/caprice-impala-ss/1995-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-43l) (Caprice Only)
  2. «TESTS W/CODES - 5.7L»(/chevrolet/caprice-impala-ss/1995-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-57l) (All Models)
  3. «SYSTEM/COMPONENT TESTS - 4.3L»(/chevrolet/caprice-impala-ss/1995-1996/remont/testing-diagnostics/#engine-controls-systemcomponent-tests-43l) (Caprice Only)
  4. «SYSTEM/COMPONENT TESTS - 5.7L»(/chevrolet/caprice-impala-ss/1995-1996/remont/testing-diagnostics/#engine-controls-systemcomponent-tests-57l) (All Models)
Application(1) Volts
4.3L & 5.7L(2) .60-5.00
(1) Voltage range is from idle position to wide open throttle position. (2) TP sensor is not adjustable.
(1)Voltage range is from idle position to wide open throttle position.
(2)TP sensor is not adjustable.

TP SENSOR ADJUSTMENT VOLTAGE

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