Mazda RX7. Manual — part 94

1.2L ENG NO POWER/STUMBLE/ROUGH IDLE/BUCKING CAT. 4, NO. 014/85

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com

Copyright © 1998 Mitchell Repair Information Company, LLC

Saturday, September 08, 2001 09:29AM

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

1.2L NEW THROTTLE SENSOR ADJUSTING PROCEDURE CAT. 1A, NO. 029/83

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com

Copyright © 1998 Mitchell Repair Information Company, LLC

Saturday, September 08, 2001 09:29AM

ARTICLE BEGINNING

TECHNICAL SERVICE BULLETIN

THROTTLE SENSOR CHECKING AND ADJUSTING PROCEDURES

Models 1983 RX-7
Bulletin No. 029/83
Category 1A
Date 2/8/83

DESCRIPTION

In order to ease extensive damage on emission control unit and
related components, electrical connection ("+" and "-") for the
circuits has been reversed.
Due to a change in the vehicle's wiring, it is necessary to connect
the alligator clip of the tester to B+ instead of ground when checking
or adjusting the throttle sensor.

Fig. 1: View of Test Connections in 1982 & 1983 Models

END OF ARTICLE

1.3L ENG THROTLE SENSR TOOL & ADJUSTMENT INFO CAT. 40, NO. 007/85

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com

Copyright © 1998 Mitchell Repair Information Company, LLC

Saturday, September 08, 2001 09:30AM

ARTICLE BEGINNING

TECHNICAL SERVICE BULLETIN

THROTTLE SENSOR CHECKER

Models 1981-85 RX-7
Bulletin No. 007/85
Category 40
Date 7/23/85

DESCRIPTION

The Throttle Sensor Checker and Attachment have been established for
adjusting the throttle sensor for 1984-1985 REX-7 (13B) with E.G.I.
and 1981-1985 RX-7 (12A) with carburetor. See Fig. 1.

Fig. 1: RX7 Throttle Adjusting Tools

PARTS INFORMATION

ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

PART NUMBER DESCRIPTION

0000 41 0200 Throttle Sensor Checker & Attachment

ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

CHECKING THROTTLE SENSOR - 1984-1985 RX-7 (13B) with E.G.I.

1. Warm up the engine to the normal operating temperature. Turn off
the engine.
2. Connect the checker to the checking connector (green).
3. Turn on the ignition switch and check that one of the lamps
illuminates. See Fig. 2.

Fig. 2: RX7 Throttle Sensor Checker Hookups

1.3L ENG THROTLE SENSR TOOL & ADJUSTMENT INFO CAT. 40, NO. 007/85

Article Text (p. 2)

1983 Mazda RX7

For www.iluvmyrx7.com

Copyright © 1998 Mitchell Repair Information Company, LLC

Saturday, September 08, 2001 09:30AM

4. If both lamps illuminate or neither lamp illuminates, proceed as
follows:
* Remove the cap from the adjusting screw.
* If both lamps illuminate turn the adjusting screw counterclock

Ä

wise until only the red lamp illuminates. Then turn the
adjusting screw an additional 1/4 turn counterclockwise.
* If neither lamp illuminates, turn the adjusting screw clockwise
until only the red lamp illuminates. Then turn the adjusting
screw an additional 1/4 turn clockwise. See Fig. 3.
5. Reinstall the cap on the adjusting screw.

Fig. 3: Adjusting Throttle Sensor

CHECKING THROTTLE SENSOR - 1981-1985 RX-7 (12A) with carburetor

1. Warm up the engine to the normal operating temperature. Turn off
the engine.
2. Disconnect the connector (brown) as shown in Fig. 4.

Fig. 4: Throttle Sensor testing

3. Connect the attachment for the throttle sensor checker to the
checking connector as shown in Fig. 5. The color of the
checking connector is:
Green - 1984-1985 RX-7
Black - 1981-1983 RX-7