Auto Repairing 1999–2001 Honda CR-V Rough Idle, Hard to Start, Poor Engine Performance, or MIL Comes On With DTC P0301, P0302, P0303, P0304, or P0172

Auto Repairing 1999–2001 Honda CR-V Rough Idle, Hard to Start, Poor Engine Performance, or MIL Comes On With DTC P0301, P0302, P0303, P0304, or P0172

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SYMPTOM The engine idles roughly, is hard to start, performs poorly, or has the MIL on with DTC P0301, P0302, P0303, P0304 (cylinder misfire), or P0172 (fuel system too rich). PROBABLE CAUSE One or more exhaust valves have receded into thecylinder head. CORRECTIVE ACTION Inspect the valve clearance and, if necessary, replace the cylinder head. INSPECTION PROCEDURE 1. Remove the cylinder head cover, and check the valve clearance on all exhaust valves. • If any of the valveclearances are below 0.09 mm, go to step 2. • If any of the valve clearances are between 0.09 and 0.16 mm, adjust the valvesto specification (0.16 to 0.20 mm). Return the vehicle to the customer.

• If the clearances are within specification, disregard this bulletin and look for other possible causes (ignition, fuel injection, etc.). 2. Ask the customer if the valves were adjusted shortly before the problem occurred. • If the valves were recently adjusted, readjust the valves to specification. • If the valves were not adjusted, proceed to REPAIR PROCEDURE. REPAIR PROCEDURE Replace the cylinder head: • See page 6-16 of the 1997–01 CR-V Service Manual. • In ISIS, enter the keyword CYL HEAD, and select Cylinder Head Removal and Cylinder Head Installation from the list. NOTE: The exhaust valves and seats may be damaged (burnt or cracked) to further indicate that the cylinder head has a problem.