* Air in fuel system:
* Coolant leak into combustion chamber:
* Block heater malfunction in cold weather:
* Clogged or defective fuel filter:
* Poor fuel quality:
* Fuel injector malfunctioning or loose:
* Restricted or blocked fuel injection or supply lines:
* Intake/exhaust valves not adjusted properly (tight):
* Intake heaters malfunctioning:
* Internal engine damage.
BLUE EXHAUST SMOKE
* Air filter dirty or plugged:
* Air intake system restricted:
* Air leak in intake between turbocharger and intake
manifold:
* Restricted exhaust:
* Restricted turbocharger drain tube:
* Crankcase ventilation plugged:
* Valve stems, guides or seals worn or defective:
* Piston rings improperly gapped, worn or broken:
* Internal engine wear:
* Turbocharger failure.
INTERMITTENTS
INTERMITTENT PROBLEM DIAGNOSIS
Intermittent fault testing requires duplicating circuit or
component failure to identify problem. These procedures may lead to
PCM setting a Diagnostic Trouble Code (FTC) which may help in
diagnosis.
If problem vehicle does not produce DTCs, monitor voltage or
resistance values using a Digital Volt-Ohmmeter (DVOM) while
attempting to reproduce conditions causing intermittent fault. A
status change on DVOM indicates a fault has been located.
Use a DVOM to pinpoint faults. When monitoring voltage,
ensure ignition switch is in ON position or engine is running. Ensure
ignition switch is in OFF position or negative battery cable is
disconnected when monitoring circuit resistance. Status changes on
DVOM during test procedures indicate area of fault.
TEST PROCEDURES
Intermittent Simulation
To reproduce conditions creating an intermittent fault, use
following methods:
* Lightly vibrate component
* Heat component
* Wiggle or bend wiring harness
* Spray component with water
* Remove/apply vacuum source
Monitor circuit/component voltage or resistance while
simulating intermittent. If engine is running, monitor for diagnostic
trouble codes. Use test results to identify a faulty component or
circuit.
H - T E STS W /O C O DES - G ASO LIN E
1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - Trouble Shooting - No Codes - Gasoline
Avenger, Breeze, Caravan, Cirrus, Concorde, Dakota, Durango,
Intrepid, LHS, Neon, Ram Pickup, Ram Van, Ram Wagon,
Stratus, Town & Country, Sebring Convertible, Sebring
Coupe, Voyager, 300M
INTRODUCTION
Before diagnosing symptoms or intermittent faults, perform
basic diagnostic procedures in the appropriate BASIC DIAGNOSTIC
PROCEDURES article and applicable self-diagnostic tests in the
appropriate SELF-DIAGNOSTICS article. 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 direct the technician to malfunctioning
component(s) for further diagnosis. A symptom should lead to a
specific component, system test or adjustment.
Use intermittent test procedures to locate driveability
problems that do not occur when the vehicle is being tested. These
problems may cause a noticeable driveability problem or cause the
Malfunction Indicator Light (MIL) to illuminate on some vehicles.
These test procedures should also be used if a soft (intermittent)
trouble code is present, but no problem is found during self-
diagnostic testing.
NOTE: For specific testing procedures, see appropriate SELF
-DIAGNOSTICS article. For specifications, see appropriate ON
-VEHICLE ADJUSTMENTS and SERVICE & ADJUSTMENT SPECIFICATIONS
articles.
SYMPTOMS
SYMPTOM DIAGNOSIS
Symptom checks cannot be used properly unless the problem
occurs while the vehicle is being tested. To reduce diagnostic time,
ensure basic diagnostic procedures and self-diagnostic were performed
before diagnosing a symptom. Symptoms available for diagnosis are as
follows:
* Hard Start
* Starts But Stalls
* Hesitation Or Stumble
* Surging
* Lack Of Power
* Knocking
* Engine Misfire
* Backfire
* Rough Or Erratic Idle
* Poor Fuel Economy
HARD START
* Lightly vibrate component
* Heat component
* Wiggle or bend wiring harness
* Spray component with water
* Remove/apply vacuum source.
Monitor circuit/component voltage or resistance while
simulating intermittent. If engine is running, monitor for DTCs. Use
test results to identify a faulty component or circuit.
