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Exhaust System Concerns

EXHAUST SYSTEM CONCERNS DESCRIPTION

PINPOINT TEST 16 EXHAUST SYSTEM CONCERNS
DESCRIPTION 
  • Smoke
EXHAUST SYSTEM CONCERNS - PINPOINT TEST REFERENCE

PINPOINT TEST 16 EXHAUST SYSTEM CONCERNS
STEP INSPECTION ACTION
1 IDENTIFY EXHAUST SMOKE COLOR
  • Identify the color of the exhaust smoke.
  • Is the exhaust smoke either black, blue or white? 
 Yes For black smoke:
Rich fuel mixture indicated.
Go to next step.
For blue smoke:
Burning oil indicated.
Go to step 8.
White smoke:
Water in combustion indicated.
Go to step 7.
No Attempt to verify symptom and exhaust smoke color.
2 BLACK SMOKE: PRELIMINARY CHECKS
  • Perform the following preliminary checks:
    • Air cleaner (restricted airflow)
    • Air tube (collapsed, restricted)
    • Fuel return lines (restricted)
  • Are all checks OK? 
 Yes Go to next step.
No Service as required.
Verify symptom no longer exists.
3 PERFORM PCM QUICK TEST
  • Perform PCM quick test. See PCM QUICK TEST .
  • Are any DTCs displayed during Continuous Memory or Key ON, Engine OFF (KOEO) Self Tests? 
 Yes Check for cause.
See DIAGNOSTIC TROUBLE CODE (DTC) INDEX - POWERTRAIN CONTROL MODULE (PCM) .
No Go to next step.
4 CHECK FUEL DELIVERY SYSTEM Yes Go to next step.
No If pressure is greater than 488 kPa (71 psi) for 3.0L/4.0L or 380 kPa (55 psi) for 2.3L:
Replace fuel pump.
See FUEL PUMP REMOVAL / INSTALLATION . If pressure is less than 207 kPa (30 psi) for 3.0L/4.0L or 240 kPa (35 psi) for 2.3L:
Check fuel supply line for restriction.
5 CHECK FUEL DELIVERY SYSTEM Yes Check injector for leakage.
See GENERAL PINPOINT TEST 11: FUEL INJECTOR INSPECTION .
If injector leaks, service as necessary.
If injector OK, go to next step.
No Check fuel supply line for restriction.
6 CHECK SECONDARY IGNITION SYSTEM
  • Is strong blue spark visible at each disconnected high-tension lead while cranking engine? 
 Yes Check spark plugs:
If OK, Goto next step.
If not OK, clean or replace spark plugs.
See SPARK PLUG REMOVAL / INSTALLATION .
No Check following:
See CAMSHAFT POSITION (CMP) SENSOR MALFUNCTION .
7 WHITE SMOKE: CHECK BASE ENGINE/COOLING SYSTEM Yes Service as required.
No Go to next step.
8 BLUE SMOKE: CHECK POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
  • Remove PCV valve and shake it.
  • Does PCV valve rattle? 
 Yes Install PCV valve.
Go to next step.
No Replace PCV valve.
See PCV VALVE REMOVAL / INSTALLATION - 2.3L for 2.3L engine.
See PVC VALVE REEMOVAL / INSTALLATION - 3.0L for 3.0L engine.
See PCV VALVE REMOVAL / INSTALLATION - 4.0L for 4.0L engine.
9 CHECK BASE ENGINE
  • Start engine and bring to normal operating temperature.
  • Disconnect crankcase ventilation hose from throttle body.
  • Place a stiff piece of paper over the hose. Wait one minute.
  • Does vacuum hold paper in place? 
 Yes Go to next step.
No Disconnect evaporative hose. Place a stiff piece of paper over the hose. Wait one minute.
Does vacuum hold paper in place?
If yes, See EVAPORATIVE EMISSION (EVAP) MONITOR AND SYSTEM MALFUNCTION step 9.
If no, check for vacuum leaks, obstructions in the PCV system, oil cap, PCV valve, valve cover bolt torque/gasket leak. Service as required.
10 CHECK BASE ENGINE
  • Check for base engine concerns (such as exhaust system backpressure (see vacuum test) damaged valve guides, valve stems, valve seals, blocked oil drain passages in the heads (blue smoke on start-up) piston rings (not seated, seized, worn) damaged cylinder bores). See ENGINE COMPONENT TEST  .
  • Is a fault indicated? 
 Yes Service as required.
No Verify test results. If OK, See SYMPTOM TROUBLESHOOTING CHART- ENGINE DRIVEABILITY  to service any additional symptoms.
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