TPS - Cold Engine Sag, Cold Engine Surge

86chrysler8

Models


1984-1985 Conquest 2.6L Without Intercooler


Subject


Cold Sag, Cold Surge


Index


DRIVEABILITY

Date

March 17, 1986


No.


18-15-86

P-936-C
SYMPTOM/CONDITION

Subject vehicle may exhibit a cold sag and/or cold surge anytime before the engine reaches normal operating temperature. This condition will be more noticeable in cold ambients and will be most pronounced under wide open throttle conditions.

PARTS REQUIRED

To determine which of the parts packages you require, refer to Vehicle Identification Number Chart below:

Last Eight Digits of VIN

1984 1985 - Early Built 1985 - Late Built

All Up to FZ415508 FZ415509 to FZ442754
Conquest Up to FZ504590 FZ504591 to FZ507261
Vehicles Up to FZ712655 FZ712656 to FZ717212
Up to FZ803805


1984 & Early 1985 Model Year Use Modulator Kit PN MD101108

Consists of:

1 Modulator PN MD099402
1 Bracket PN MD099403
4 Screw PN MF243622
1 Wiring Harness PN MD099789

Must be ordered separately:

1 Authorized Modification Label PN 4275086
Late 1985 Model Year Use Modulator Kit PN MD104640

Consists of:

1 Modulator PN MD104805
1 Bracket PN MD099403
4 Screw PN MF243622
1 Wiring Harness PN MD099789

Must be ordered separately:

1 Authorized Modification Label PN 4275086

REPAIR PROCEDURE

This repair procedure involves the installation of a modulator kit to alter the throttle potentiometer schedule to the ECI. After this repair, the throttle position sensor output voltage, as measured at the ECI, should not exceed 3 volts at wide open throttle.

1. Disconnect the negative battery cable.

FIGURE 1:

2. Remove the under-cover located beneath the glove, box. Disconnect the in-car sensor wire from the under-cover as shown in Figure 1.
3. Remove the glove box from the instrument panel.

4. Remove the glove box striker.

5. Remove the ECI unit from behind the right kick pad.

6. Connect the new wiring harness to the ECI unit.

FIGURE 2:

7. Also connect the new wiring harness to the existing vehicle wiring harness as shown in Figure 2.

FIGURE 3:

8. Reinstall the ECI unit along with the newly attached wiring harness. Make sure the new harness is correctly routed and secured (Figure 3).
9. Attach modulator, PN MD099402 or MD104805 for 1985-1/2, to bracket, PN MD099403, using the four screws, PN MF243622.

10. Connect the modulator to fhe newly installed wiring harness.

11. Attach modulator and bracket assembly, along with the glove box striker, to the instrument panel.

12. Reinstall glove box.
13. Reconnect in-car sensor on the under-cover to vehicle wiring harness and reinstall under-cover onto instrument panel.

14. Reconnect negative battery cable.

15. Start engine and road test vehicle to insure the sag and/or surge has been eliminated.

FIGURE 4:

16. Attach Authorized Modification Label, PN 4275086, as illustrated in Figure 4.

POLICY: Reimbursable within the provisions of the warranty

TIME ALLOWANCE:
Labor Operation No. 08-15-62-90 0.8 Hrs.

FAILURE CODE: AM - Authorized Modification