Engine Controls Tests W/O Codes - Gasoline: Introduction

Before diagnosing symptoms or intermittent faults, perform BASIC DIAGNOSTIC PROCEDURES in appropriate article:

For 4.2L & 4.6L vehicles,

see BASIC TESTING - 4.2L & 4.6L .

For 5.4L Pickup, see BASIC TESTING - 5.4L .

For 5.4L Van, see BASIC TESTING - 5.4L .

For 6.8L Van, see BASIC TESTING - 6.8L .

Also perform QUICK TEST in appropriate article:

For 4.2L Van, see TESTS W/CODES - 4.2L .

For 4.6L Van, see TESTS W/CODES - 4.6L .

For 5.4L Van, see TESTS W/CODES - 5.4L GASOLINE .

For 6.8L Van, see TESTS W/CODES - 6.8L .

For 4.2L Pickup, see TESTS W/CODES - 4.2L .

For 4.6L Pickup, see TESTS W/CODES - 4.6L .

For 5.4L Pickup, see TESTS W/CODES - 5.4L GASOLINE .

Use this article to diagnose driveability problems existing when a hard fault code is not present.

NOTE: Some driveability problems may have been corrected by manufacturer with a revised Powertrain Control Module (PCM). Check with manufacturer for latest PCM application.

Symptom checks can direct the technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component or system test and/or adjustment.

Use intermittent test procedures to locate driveability problems that DO NOT occur when the vehicle is being tested. These test procedures should also be used if a soft (intermittent) trouble code was present, but no problem was found during self-diagnostic testing.

NOTE: For specifications, see ADJUSTMENTS or appropriate article:

For 4.2L Pickup, see SPECIFICATIONS - 4.2L .

For 4.6L Pickup, see SPECIFICATIONS - 4.6L .

For 5.4L Pickup, see SPECIFICATIONS - 5.4L GASOLINE .

For 4.2L Van, see SPECIFICATIONS - 4.2L .

For 4.6L Van, see SPECIFICATIONS - 4.6L .

For 5.4L Van, see SPECIFICATIONS - 5.4L GASOLINE .

For 6.8L Van, see SPECIFICATIONS - 6.8L .