Chrysler PT Cruiser. Manual — part 496
Knock retard uses its own short term and long
term memory program.
Long term memory stores previous detonation
information in its battery-backed RAM. The maxi-
mum authority that long term memory has over tim-
ing retard can be calibrated.
Short term memory is allowed to retard timing up
to a preset amount under all operating conditions (as
long as rpm is above the minimum rpm) except WOT.
The PCM, using short term memory, can respond
quickly to retard timing when engine knock is
detected. Short term memory is lost any time the
ignition key is turned off.
NOTE: Over or under tightening affects knock sen-
sor performance, possibly causing improper spark
control.
REMOVAL
REMOVAL - 1.6L
(1) Remove air cleaner assembly cover.
(2) Disconnect the negative battery cable.
(3) Disconnect the electrical connector for the sen-
sor (Fig. 26) (Fig. 27).
(4) Remove knock sensor. The knock sensor is
located under the intake manifold (Fig. 27).
REMOVAL - 2.0/2.4/2.4 TURBO/2.4L SRT-4
The knock sensor bolts into the side of the cylinder
block in front of the starter under the intake mani-
fold (Fig. 28).
Fig. 26 WIRING CONNECTOR
Fig. 27 KNOCK SENSOR
Fig. 28 KNOCK SENSOR LOCATION
8I - 12
IGNITION CONTROL
PT
KNOCK SENSOR (Continued)
(1) Disconnect the negative battery cable.
(2) Disconnect electrical connector from knock sen-
sor (Fig. 29).
(3) Remove the bolt holding the knock sensor
(4) Remove the knock sensor (Fig. 30).
INSTALLATION
INSTALLATION - 1.6L
(1) Install the knock sensor (Fig. 27) Tighten
knock sensor bolt to 22 N·m (195 in. lbs.) torque.
Over or under tightening effects knock sensor
performance resulting in possible improper
spark control..
(2) Connect the electrical connector for the sensor
(Fig. 26).
(3) Connect the negative battery cable.
(4) Install air cleaner assembly cover.
INSTALLATION - 2.0/2.4/2.4 TURBO/2.4L
SRT-4
The knock sensor bolts into the side of the cylinder
block in front of the starter under the intake mani-
fold.
(1) Install knock sensor (Fig. 30). Tighten knock
sensor bolt to 22 N·m (195 in. lbs.) torque. Over or
under tightening effects knock sensor perfor-
mance, possibly causing improper spark con-
trol.
(2) Attach electrical connector to knock sensor
(Fig. 29).
(3) Connect the negative battery cable.
SPARK PLUG
REMOVAL
REMOVAL - 1.6L
(1) Remove air cleaner assembly cover (Fig. 10).
(2) Disconnect the negative battery cable.
(3) Disconnect the electrical connector at the throt-
tle body.
(4) Remove the purge hose from throttle body.
(5) Remove the 4 bolts from the upper to lower
manifold (Fig. 11).
(6) Remove the 2 bolts to the upper manifold to
struts (Fig. 12) and (Fig. 13).
(7) Remove the PCV hose and the brake booster
hose from the upper manifold
(8) Remove the 4 bolts from the ignition coil.
(9) Remove the spark plug cables from the ignition
coil.
Fig. 29 KNOCK SENSOR REMOVED
Fig. 30 KNOCK SENSOR
PT
IGNITION CONTROL
8I - 13
KNOCK SENSOR (Continued)
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
REMOVE CABLES FROM COIL FIRST.
Always remove the spark plug cable by grasping
the top of the spark plug insulator, turning the boot
1/2 turn and pulling straight up in a steady motion.
(10) Remove the spark plug using a quality socket
with a rubber or foam insert and special tool # 8448
(Fig. 31) on the extension to keep from damaging the
spark plug tubes in the cylinder head and valve
cover.
(11) Inspect the spark plug condition.
REMOVAL - 2.0/2.4L
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
NOTE: REMOVE cables from coil first before remov-
ing spark plug insulator.
Special care should be used when installing spark
plugs in the 2.4L cylinder head spark plug wells. Be
sure the plugs do not drop into the wells, damage to
the electrodes can occur.
Always tighten spark plugs to the specified torque.
Over tightening can cause distortion resulting in a
change in the spark plug gap. Overtightening can
also damage the cylinder head.
(1) Remove the air cleaner lid, disconnect the inlet
air sensor and makeup air hose.
(2) Disconnect the negative battery cable.
(3) Remove the upper intake manifold, refer to the
Engine section for more information.
(4) Disconnect the cable from the ignition coil first.
Always remove the spark plug cable by grasping
the top of the spark plug insulator, rotate the boot
90° and pulling straight up in a steady motion.
(5) Remove the spark plug using a quality socket
with a rubber or foam insert.
(6) Inspect the spark plug condition.
REMOVAL - 2.4L TURBO
Special care should be used when installing spark
plugs in the 2.4L cylinder head spark plug wells. Be
sure the plugs do not drop into the wells, damage to
the electrodes can occur.
NOTE: REMOVE cables from the coil first before
removing spark plug insulator.
(1) Disconnect the negative battery cable.
(2) Unlock and disconnect the MAP sensor electri-
cal connector.
(3) Remove the throttle control shield.
(4) Disconnect the cable from the ignition coil first.
Always remove the spark plug insulator, rotate the
boot 90° and pulling straight up in a steady motion.
(5) Remove the spark plug using a quality socket
with a rubber or foam insert (Fig. 32).
(6) Inspect the spark plug condition.
Fig. 31 SPECIAL TOOL # 8448
Fig. 32 SPARK PLUG REMOVAL/INSTALLATION -
2.4L TURBO
8I - 14
IGNITION CONTROL
PT
SPARK PLUG (Continued)
INSTALLATION
INSTALLATION - 1.6L
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
(1) To avoid cross threading, start the spark plug
into the cylinder head by hand.
(2) Use special tool # 8448 to install and tighten
the spark plug. Tighten spark plugs to 28 N·m (20 ft.
lbs.) torque.
(3) Install spark plug insulators over spark plugs.
Ensure the top of the spark plug insulator covers the
upper end of the spark plug tube.
(4) Reconnect to cables to coil.
(5) Install the 4 bolts from the upper to lower
manifold (Fig. 11).
(6) Install the 2 bolts to the upper manifold to
struts (Fig. 12) and (Fig. 13).
(7) Install the PCV hose and the brake booster
hose to the upper manifold
(8) Install the purge hose to throttle body.
(9) Connect the electrical connector to throttle
body.
(10) Connect the negative battery cable.
(11) Install air cleaner assembly cover and inlet
air temperature sensor (Fig. 10).
INSTALLATION - 2.0/2.4L
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
NOTE: REMOVE cables from coil first before remov-
ing spark plug insulator.
Special care should be used when installing spark
plugs in the 2.4L cylinder head spark plug wells. Be
sure the plugs do not drop into the wells, damage to
the electrodes can occur.
Always tighten spark plugs to the specified torque.
Over tightening can cause distortion resulting in a
change in the spark plug gap. Overtightening can
also damage the cylinder head.
(1) To avoid cross threading, start the spark plug
into the cylinder head by hand.
WARNING: The tapered seat plugs for this applica-
tion are torque-critical! It is imperative that 17.6 N·m
+/- 2 (13 +/- 2 ft. lbs.) is NOT exceeded!
(2) Tighten spark plugs to 17.6 +/- 2 N·m (13 +/- 2
ft. lbs.) torque.
(3) Install spark plug insulators over spark plugs.
Ensure the top of the spark plug insulator covers the
upper end of the spark plug tube.
(4) Install spark plug cable to coil.
(5) Install the upper intake manifold, refer to the
Engine section for more information
(6) Connect the negative battery cable.
(7) Install the air cleaner lid and connect the inlet
air temperature sensor and makeup hose.
INSTALLATION - 2.4L TURBO
Special care should be used when installing spark
plugs in the 2.4L cylinder head spark plug wells. Be
sure the plugs do not drop into the wells, damage to
the electrodes can occur.
NOTE: INSTALL cables to the spark plug first before
installing them to the ignition coil.
(1) Install the spark plug using a quality socket
with a rubber or foam insert. Tighten plus to N·m
17.6 ±2 (13 ±2 ft. lbs.). DO NOT OVER TIGHTEN, it
is imperative that the torque is NOT EXCEEDED.
(2) Install the throttle control shield.
(3) Connect and lock the MAP sensor electrical
connector.
(4) Connect the negative battery cable.
SPARK PLUG CABLE
DESCRIPTION
Spark Plug cables are sometimes referred to as
secondary ignition wires. The wires transfer electri-
cal current from the ignition coil pack to individual
spark plugs at each cylinder. The resistive spark plug
cables are of nonmetallic construction. The cables
provide suppression of radio frequency emissions
from the ignition system.
Check the spark plug cable connections for good
contact at the coil, and spark plugs. Terminals should
be fully seated. The insulators should be in good con-
dition and should fit tightly on the coil, and spark
plugs. Spark plug cables with insulators that are
cracked or torn must be replaced.
Clean Spark Plug cables with a cloth moistened
with a non-flammable solvent. Wipe the cables dry.
Check for brittle or cracked insulation. The spark
plug cables and spark plug boots are made from high
temperature materials.
PT
IGNITION CONTROL
8I - 15
SPARK PLUG (Continued)
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