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Mazda truck heads

Some 2004-2006 Mazda B3000 light trucks may experience a MIL on with DTCs P0300-P0306 and P0316 set, rough running at various rpm, rough idle and misfires. This may be due to an engine exhaust valve seat recession causing a loss of compression.

  1. Verify the concern.
  2. Identify and keep records of any cylinder that has a concern by recording freeze frame data for that DTC.
  3. Perform a manual compression check with the spark plugs removed to locate any cylinder that may have low compression. If low compression is not found, proceed with normal misfire diagnostics for the appropriate model year. If low compression is found, and it is a cylinder that had a misfire on power balance, perform a leakdown test to determine the source of leakage. Refer to the workshop manual section 01-01 Cylinder Leakage Detection under Engine Component Test. If low compression is found in a cylinder that did not have a misfire detected, then proceed with normal engine diagnostics. See workshop manual section 01-01 Symptom Troubleshooting Chart – Engine Mechanical.
  4. If the exhaust valve is identified as the source, replace both cylinder heads with the newly released cylinder heads.

PARTS INFORMATION

P/N                            DESCRIPTION                      QUANTITY

1F00-10-100A…...…….Cylinder head……………....……..2

1F61-10-234A……...….Cyl. head gasket set……….…….1

ZZP1-10-135………......Cyl. head bolt……………….....…16

ZZM1-13-462……….....Exh. manifold gasket……..…........2

1F71-10-235………...…Head cover gasket…………….....2

ZZM4-13-111………......Intake manifold gasket……..……2

1F27-13-135………...…Gasket (front)………………...…..1

1F24-13-135………...…Gasket (rear)..…………….....…..1

1F71-13-135………...…Surge tank gasket……………….1

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