Es

(1) Shift the gear selector lever to the D position.

(4) If misfire counts are still not displayed, perform steps (h) and (i) and then check the misfire counts again.

(h) Drive the vehicle with the MISFIRE RPM and MISFIRE LOAD noted in step 2.

(i) Read the CYL #1 to #4 or DTCs displayed on the tester.

Result

Misfire Count

Proceed To

One or two cylinders have misfire counts

A

Three cylinders or more have misfire counts

Go to step 13

CHECK SPARK PLUG

(a) Remove the ignition coil and the spark plug of the misfiring cylinder.

(b) Measure the spark plug electrode gap. Standard:

Between 1.0 mm and 1.3 mm (0.039 in. and 0.051 in.)

(c) Check the electrode for carbon deposits. Recommended spark plug

Manufacturers

Products

DENSO

SK20HR11

NGK

If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

REPLACE SPARK PLUG

CHECK SPARK AND IGNITION

(a) Disconnect the injector connectors, in order to prevent the engine from starting.

(b) Install the spark plug to the ignition coil.

(c) Attach the spark plug assembly to the cylinder head cover set bolt.

(d) Crank the engine for less than 2 seconds and check the spark.

Sparks jump across electrode gap

(e) Reconnect the injector connectors.

Go to step 8

CHECK CYLINDER COMPRESSION PRESSURE ON MISFIRING CYLINDER

(a) Measure the cylinder compression pressure of the misfiring cylinder.

Go to step 9

REPAIR OR REPLACE ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

CHANGE NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER

(a) Change the installed spark plug to a spark plug that functions normally.

(b) Perform a spark test. CAUTION:

Always disconnect each injector connector. NOTICE:

Do not crank the engine for more than 2 seconds.

(1) Install the spark plug to the ignition coil and connect the ignition coil connector.

(2) Disconnect the injector connector.

(3) Ground the spark plug.

(4) Check if sparks occur while the engine is being cranked.

Sparks jump across electrode gap.

REPLACE SPARK PLUG

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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