Turbo Charger, ECU - Engine Hesitation

Bulletin No.
009/91

Issued
3/22/91

Revised



Category
F



Applicable Model/s
1989-'91 RX-7 Turbo



Subject
HESITATION ON ACCELERATION



DESCRIPTION

Some 1989-'91 RX-7 Turbo owners may complain of engine hesitation. This occurs during hard acceleration between 3,500-4,000 rpm. Enlarging the hole in the wastegate orifice will eliminate this problem. A modified ECU installed during production since August 23, 1990 helps correct this problem.





AFFECTED OR SUBJECT VEHICLES



REPAIR PROCEDURE

1. Verify that all emission components are functioning properly. Use a Self-Diagnosis Checker (49 H0189A1) to check for malfunction codes.





2. Remove the orifice in the turbocharger wastegate vacuum hose circuit. Figure 1.

3. Enlarge the orifice to 2 mm (.080 in).

NOTE:
Do not enlarge the orifice to more than 2 mm (.080 in). Doing so may lower power.

4. Reinstall the orifice.



WARRANTY INFORMATION

Warranty Type Code:
A

Customer Comment Code:
99

Damage Code:
99

Part No. of Main Cause:
N370 13 7000

Quantity:
0 (zero)

Operation No:
XX0418RX

Labor Hour:
0.4 Hrs.