1.2L Eng No Power/Stumble/Rough Idle/Bucking - Mazda 1983 RX7 Service Manual

1.2L ENG NO POWER/STUMBLE/ROUGH IDLE/BUCKING CAT. 4, NO. 014/85
ARTICLE BEGINNING
TECHNICAL SERVICE BULLETIN
APPLICATION
1981-85 RX7 (High Altitude Vehicles)
SUBJECT
No Power, Stumble, Rough Idle, Bucking, Etc.
REFERENCE
Mazda Motors Corp., Service Bulletin, No. 4 014/85, August, 1985
CONDITION & CAUSE
Some 1981-85 RX7 high altitude vehicles may exhibit one or more of the
following driveability problems:
* Lack of acceleration, hesitation on acceleration
* No power under load
* Engine stumble, surge or bucking below approximately 3000 RPM
* Rough idle
One or more of the above conditions may be caused by the altitude
compensator valve. The altitude compensator valve is attached to the
carburetor to supply additional air into the carburetor at high
altitudes (1640-4920 ft.)
REPAIR
1) Remove the altitude compensator valve. Blow through the valve from
port "A" and "B". Above 4920 feet, air from port "A" should exit from
port "D" and air into port "B" exits from port "C".
2) Below 1640 feet air should not pass through valve. If not, replace
the altitude compensator valve (N249 20 770).
END OF ARTICLE
Article Text
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Saturday, September 08, 2001 09:29AM