Engine - Constant Rough Idle, Black/Blue Exhaust Smoke

89mazda06

Category Applicable Model/s

1 1988-1989
626/MX-6
Subject CYLINDER HEAD
Bulletin No. 041/89
Issued 9/27/89
Revised



DESCRIPTION

If the following conditions occur on the 1988-1989 626/MX-6 with low mileage (less than 3,000 miles), the cylinder head may have a crack around the intake valve guide, allowing engine oil to penetrate into the combustion chamber. If necessary, remove the cylinder head and inspect it.
CUSTOMER'S COMMENTS:

1. Rough idle, all the time.
2. Black/Blue smoke emitted from exhaust pipe.

PROBLEM CONDITIONS:
1. Spark plugs are fouled with oil and fuel.
2. Oil level is low.

A modification has been introduced in production since March 1989. In connection with that modification, clips have been installed on the inlet valve guides.



VIN OF PRODUCTION CHANGE

^ 1988-1989 626/MX-6 [Vehicles manufactured in Japan]

JMIGD****K1753711 March, 1989

^ 1989 MX-6 [Vehicles manufactured in the U.S.A.]

IYVGD31C6K5239856 April 13, 1989

PARTS INFORMATION