Fuel System - Rough Idle In Hot Weather

89chrysler02

Models


1988 Turbo I & II E-, G-, H-, J-, K-, & P-Body Vehicles


Subject


Rough Idle in Hot Weather


Index


DRIVEABILITY


Date

December 30, 1988

No.


18-22-88

P-5446 (C18-24)
SYMPTOM/CONDITION

With the engine at operating temperature and at idle, a drop in engine rpm may occur that results in an abnormal rough idle.


DIAGNOSIS

The idle drop is due to location at which fuel vapors from the vehicle charcoal canister are purged into the intake manifold.

This condition is most likely to occur with ambient temperatures above 90~F.

Due to varying operating conditions, it may be difficult to duplicate the rough idle condition when the vehicle is in the dealership.


PARTS REQUIRED

Driveability Kit PN 4419457

Consisting of:

1 Vacuum Tube Assembly
1 1/4" Vacuum Connector
1 Manifold Vacuum/Pressure Connector
1 Clamp (For Manifold Vacuum Fitting)
1 3/16" Vacuum Connector
2 Tie Wraps

Additional Parts Required for Turbo I Vehicles:

1 8" Piece 3/16" Vacuum Hose (Bulk PN 3751863)

FIGURE 1:

REPAIR PROCEDURE


Turbo I Vehicle: Refer to Figure 1

1. Remove the 3/8" vacuum line from the original manifold vacuum/pressure connector.

2. Remove the original manifold connector and install the supplied 3-way connector.

3. Install the 3/8" vacuum line and new clamp onto the manifold connector.

4. Remove the bypass valve vacuum hose from the throttle body.

5. Use the 3/16" vacuum hose and in-line connector to connect the bypass valve hose to one of the 3/16" ports of the manifold vacuum connector.

6. Disconnect the canister purge line from the PCV vacuum harness at the grey tee connector.

7. Remove and discard purge check valve and black vacuum tee from the PCV line.

8. Install the 1/4" vacuum connector in the PCV line.

9. Install the supplied vacuum tube assembly from the grey tee connector to the throttle body.

10. Tie wrap the vacuum tube assembly to existing vacuum line for support.

FIGURE 2:

Turbo II Vehicles: Refer to Figure 2.

1. Disconnect the canister purge line from the PCV vacuum harness at the grey tee connector.

2. Remove and discard purge check valve and black vacuum tee from the PCV line.

3. Install the 1/4" vacuum connector in the PCV line.

4. Remove cap from unused port on throttle body.

5. Install the supplied vacuum tube assembly from the grey tee connector to the throttle body.

6. Tie wrap the vacuum tube assembly to existing vacuum line for support.
POLICY: Reimbursable within the provisions of the warranty


TIME ALLOWANCE:
Labor Operation No. 25-01-15-92 . . . . . . . . 0.5 Hrs.


FAILURE CODE: 31 - Rough Idle