Throttle Body - Intermittent Power Loss
NO.: 18-04-93GROUP: Driveability
DATE: Apr. 16, 1993
SUBJECT:
Intermittent Loss of Engine Power During Slow Speed Deceleration
NOTE:
THIS TECHNICAL SERVICE BULLETIN APPLIES TO VEHICLES EQUIPPED WITH 3.0L ENGINES.
MODELS:
1990-1992 (AA) Spirit/Acclaim
(AC) Dynasty/New Yorker Salon
(AG) Daytona
(AJ) LeBaron
(AS) Caravan/Grand Caravan/Caravan C/V
Voyager/Grand Voyager
1990-1991 (AQ) Chrysler TC
SYMPTOM/CONDITION:
Intermittent loss of power during slow speed deceleration or long crank times when cold.
DIAGNOSIS:
If the engine slows or operates rough after deceleration, or requires long crank times when cold, it may be caused by residue which has accumulated between the throttle blade and the throttle body bore. This residue will restrict air flow at closed throttle. Removing the residue will return the minimum air flow speed to proper specifications.
PARTS REQUIRED:
1 Mopar Parts Cleaner 4318037
1 Throttle Body Base Gasket 4324426
Scotch Brite Pad (green)
REPAIR PROCEDURE:
This repair involves verifying minimum air flow, and/or removing the throttle body, and cleaning the throttle body bore and throttle blade.
1. Perform the minimum air flow test as outlined in the Powertrain Diagnostic Procedure Manual. Be sure to use Tool C-5004.
2. If the minimum air flow RPM is below the acceptable range as specified in the appropriate service manual or diagnostic manual, remove the throttle body.
3. While holding the throttle body open, spray the throttle bore with Mopar Parts Cleaner P/N 4318037. Spray the entire throttle body bore and the manifold side of the throttle blade. It is important to use only Mopar Parts Cleaner. Do not submerse the throttle body in solvents, gasoline, or other cleaning fluids.
CAUTION:
USE THIS CLEANER ONLY IN A WELL VENTILATED AREA. DO NOT LET THE CLEANER COME IN CONTACT WITH SKIN. BUTYL OR RUBBER GLOVES ARE RECOMMENDED. WASH THOROUGHLY AFTER USE. AVOID EYE CONTACT. AVOID INGESTING.
4. Use a small (1" X 1") piece of the scuff pad (Scotch Brite) to clean the throttle body bore and the throttle blade. While holding the throttle open, clean both the top and bottom of the throttle body bore. Also clean the manifold side and edges of the throttle blade.
NOTE:
IT IS IMPORTANT THIS CLEANING OPERATION BE PERFORMED THOROUGHLY AND COMPLETELY. THE EDGE OF THE THROTTLE BLADE AND THE PORTION OF THE THROTTLE BODY BORE CLOSEST TO THE AREA OF THE CLOSED THROTTLE BLADE ARE THE MOST CRITICAL AREAS WHERE THE CLEANING SHOULD BE CONCENTRATED. THESE AREAS MUST BE FREE OF ALL DEPOSITS WHEN THE CLEANING IS COMPLETED.
5. Spray the throttle body with Mopar Parts Cleaner and then dry with compressed air. Inspect for any foreign material which may have been left behind from the cleaning process.
CAUTION:
DO NOT APPLY COMPRESSED AIR DIRECTLY INTO THE THROTTLE SHAFT AND THROTTLE BODY HOUSING HOLES.
6. Install the throttle body and check the minimum air flow. If the air flow is still not within specification, repeat the cleaning procedure in step 4 above. If the minimum air flow is still not within specifications, the problem is not caused by throttle body contamination.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE
Labor Operation No. 14-30-01-99 1.2 Hrs.
FAILURE CODE: 08 - Blocked