ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-27
Surge
(Engine power vari-
ation under steady
throttle or cruise.
Feels like vehicle
speeds up and
down with no
change in accelera-
tor pedal.)
Leaky or loosely connected high-tension cord “High-tension Cords Inspection” in Sec-
tion 6F2.
Faulty spark plug (excess carbon deposits,
improper gap, and burned electrodes, etc.)
“Spark Plugs Inspection” in Section
6F2.
Variable fuel pressure “Table B-3 Fuel Pressure Check” in this
section.
Kinky or damaged fuel hose and lines
Faulty fuel pump (clogged fuel filter)
Malfunctioning EGR valve “EGR Valve Inspection” in Section 6E2.
Poor performance of MAF sensor “Mass Air Flow (MAF) and Intake Air
Temperature (IAT) Sensor Inspection”
in Section 6E2.
Faulty fuel injector “Table B-1 Fuel Injector Circuit” in this
section.
Faulty ECM
Excessive detona-
tion
(Engine makes con-
tinuously sharp
metallic knocks that
change with throttle
opening. Sounds
like pop corn pop-
ping.)
Faulty spark plug “Spark Plugs Inspection” in Section
6F2.
Loose connection of high-tension cord “High-tension Cords Removal and
Installation” in Section 6F2.
Engine overheating “Overheating” in this table.
Clogged fuel filter (faulty fuel pump) or fuel
lines
“Table B-1 Fuel Injector Circuit Check”
or “Table B-2 Fuel Pump and Its Circuit
Check” in this section.
Air inhaling from intake manifold or throttle
body O-ring
Malfunctioning EGR valve “EGR Valve Inspection” in Section 6E2.
Poor performance of knock sensor, ECT sen-
sor or MAF sensor
“DTC P0327 Knock Sensor Circuit Low”
or “DTC P0328 Knock Sensor Circuit
High” in this section, “ECT Sensor
Inspection” or “Mass Air Flow (MAF)
and Intake Air Temperature (IAT) Sen-
sor Inspection” in Section 6E2.
Faulty fuel injector(s) “Table B-1 Fuel Injector Circuit Check”
in this section.
Faulty ECM
Excessive combustion chamber deposits “Pistons, Piston rings, Connecting
Rods and Cylinders Inspection” in Sec-
tion 6A2.
VVT system out of order “Oil Control Valve Inspection” in Section
6E2.
Condition Possible Cause Reference Item
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