Engine Performance - Stalls, Idle Fluctuates With A/C ON
Bulletin No.: 032/92Issued: 12/23/92
Revised
Category
F
Applicable Model/s
1993 RX-7
Subject
ENGINE STALLS DURING WARM-UP/ IDLE FLUCTUATION
AFFECTED VINS
This bulletin applies to 1993 RX-7 M/T models with a VIN of JM1FD3312P0208703 or lower produced through July 2, 1992.
This bulletin does not apply to to 1993 RX-7 M/T models with a VIN equal to or greater than JM1FD3312P0208704 and produced after July 2, 1992.
This bulletin applies to 1993 RX-7 A/T models with a VIN of JM1FD331XP0210513 or lower produced through September 30, 1992.
This bulletin does not apply to 1993 RX-7 A/T models with a VIN equal to or greater than JM1FD331XP0210514 and produced after September 30, 1992.
DESCRIPTION
Some 1993 RX-7 vehicles may experience stalling during deceleration with the throttle released, approaching a stop. This occurs during initial warm-up and, sometimes, after reach normal operating temperature. The engine will then restart easily and stalling may not reoccur until the next cold engine start.
Also, when idling with the A/C on, engine speed decreases as the A/C compressor engages and idle fluctuation may occur.
The ECU has been modified as a countermeasure. If any of the above symptoms are encountered, replace the ECU. The modified ECU is designed to:
1. Make necessary air-fuel ratio adjustments to maintain stable idle at all temperatures (for A/T & M/T).
2. Turn off the A/C compressor when the clutch pedal is depressed or when the accelerator pedal is released (for M/T).
REPAIR PROCEDURE
Removal & installation procedures are shown in Section F of the Workshop Manual. See Parts Information for list of replacement parts.
PARTS INFORMATION
PART NUMBER DESCRIPTION
N3A1 18 881R ECU (Federal M/T)
N3A2 18 881R ECU (Federal A/T)
N3A3 18 881R ECU (California M/T)
N3A4 18 881R ECU (California A/T)
CORE RETURN PROCEDURES
1. Fill out a Warranty Shipping Record form.
2. Ship the old ECU to:
MMA - Customer Support
2 Cromwell Irvine, CA 92718
ATTN: Warranty Dept.
3. Failure to ship the old ECU will result in the denial of the warranty claim.
4. Refer to Parts Bulletin No. R-11 for details.
WARRANTY INFORMATION
(Applies to vehicles covered under warranty.)
Warranty Type Code: A
Customer Comment Code: 03
Damage Code: 99
Part No. of Main Cause: N3A1 18 881R
N3A2 18 881R
N3A3 18 881R
N3A4 18 881R
Operation No: F0812XRX
Labor Hours: 0.3 hrs.