SMEC - Engine Hesitation or Popback

90chrysler05

Models

1988 N Body Truck


Subject

Engine Hesitation, Sag or Backfire on Light Throttle Tip-In - Vehicles Equipped with 3.9L Engine and 3 Speed Automatic Trans


Index

DRIVEABILITY


Date

March 12, 1990


No.

18-10-90

(C18-01-0)
P-662
BODY CODE LEGEND

N - DAKOTA (4x2 and 4x4)


SYMPTOM/CONDITION

Customer may encounter engine hesitation, sag (lack of power), or occasional popback (backfire) during light throttle tip-in. Condition may occur when engine is cold or warm.

DIAGNOSIS

Before proceeding to the repair procedure, verify the system is functioning as designed using the appropriate diagnostic test procedure.

PARTS REQUIRED

1 Engine Controller PN 4379581
(Federal/Canada/Hi-Altitude) (California - Less than 3750 GVW)

1 Engine Controller PN 4379583
(California - Greater than 3750 GVW)

1 Authorized Modification Label PN 4275086


REPAIR PROCEDURE

This procedure involves replacing the engine controller (SMEC) with a revised engine controller.

1. Replace engine controller with appropriate controller as called out in PARTS REQUIRED.

Figure 1:

2. Type authorized modification label, PN 4275086 as shown in Figure 1 and attach near VECI label.
POLICY: Reimbursable within the provisions of the warranty.


TIME ALLOWANCE:
Labor Operation No. 08-19-03-90 0.3 Hrs.


FAILURE CODE: AM - Authorized Modification