MIL ON - DTC P0300 Through P0304 (Engine Misfires)

Classification:
EC97-047a

Reference:
NTB98-021a

Date:
February 15, 1999

MIL "ON" WITH DTCS P0300 THROUGH P0304 (ENGINE MISFIRE) STORED OR ENGINE ROUGH RUNNING DUE TO SPARK PLUG WIRE(S)

This amended version of NTB98-021 updates information in the applied vehicle, Applied Date and claims information sections. Please discard previous distributed copies of NTB98-021.

Applied vehicles:
1995-98 Sentra / 200SX (B14),vehicles built before:
1N4AB41D6WC738700, 1N4AB42D7WC517539, 3N1AB41D4WL062751 (Mexico produced).

1995-97.5 Altima (U13), vehicles built before:
1N4BU31D3VC245368

1998 Altima (L30), vehicles built before:
1N4DL01D8WC165916

APPLIED DATES:
1995-98 SENTRA / 200SX (B14), VEHICLES BUILT BEFORE:
FEBRUARY 1, 1998; OR MARCH 17, 1998 (MEXICO PRODUCED)

1995-97.5 ALTIMA (U13), VEHICLES BUILT BEFORE:
MARCH 5, 1997

1998 ALTIMA (L30), VEHICLES BUILT BEFORE:
OCTOBER 28, 1997

SERVICE INFORMATION

If the applied vehicles have a MIL "ON" with DTCs P0300 through P0304 (cylinder misfire) stored or exhibit engine rough running, the cause may be a cracked spark plug wire tube(s).

Use the following procedure to inspect the spark plug wire tubes.

SERVICE PROCEDURE

1. Remove the spark plug wires and inspect for water in the spark plug holes.

A. If water is in the spark plug holes, perform the following steps:

1) Remove water from the spark plug holes.





2) Insert a paper clip through the steam vent hole in the spark plug wire boots to insure the holes are clear (see Figure 1).

NOTE:
The steam vent hole allows water vapor to escape if water becomes trapped in the spark plug hole.

3) Inspect spark plug wire boots for cracks, hardening or deformities that could prevent sealing between the boots and the camshaft (valve) cover.

4) Replace all spark plug wires if one or more of the boots show signs of cracks, hardening or deformities.

B. If the spark plug holes are dry and the spark plug wire boots are in good condition, proceed with step 2.





2. Inspect the entire surface of each spark plug wire tube for pin holes and/or cracks (see Figure 2)

A. If one or more spark plug wire tubes have pin holes and/or cracks, replace all spark plug wires.

B. If the spark plug wire tubes do not have cracks or pin holes, use the service manual to diagnose the DTCs.





PARTS INFORMATION





CLAIMS INFORMATION

If applicable, submit a Primary Failed Part (PP) line using the claims coding as shown.