Engine - Hesitation/Stumble/Stalls On Acceleration

87ford5

^ HESITATION - 2.3L OHC - CARBON BUILD-UP Article No.
INSIDE ENGINE 87-8-18

^ STUMBLES - 2.3L OHC - CARBON BUILD-UP INSIDE ENGINE

^ STALL - DURING ACCELERATION - 2.3L OHC - CARBON BUILD-UP
INSIDE ENGINE


LIGHT TRUCK: 1985-87 RANGER 1986-87 AEROSTAR

ISSUE: Hesitation, stumble and/or stalls on acceleration from idle may be caused by carbon deposits on the back of the intake valves (intake manifold side), combustion chamber (head and piston) and intake ports. These carbon deposits, on vehicles which normally have accumulated at least 5,000 miles (8,000 kilometers), may be caused by an engine oil overfill in the crankcase. Affected vehicles are 1985-87 units built from 03/18/85 to 10/20/86.

ACTION: To correct this, remove the carbon deposits from the engine and install a new calibrated oil dipstick (E7TZ- 6750-G) and oil tube assembly (E6TZ- 6754-F) using the following service procedure.

1. Drain the engine coolant and save for reuse. Remove the head and intake valves. Refer to the appropriate 1987 Light Truck/Aerostar Shop Manual.

2. Clean the combustion chamber, (head and piston), intake valves and intake ports of carbon deposits using Combustion Chamber Cleaner (D9AZ-19579-B).


3. Reinstall the heads.

4. Clean the throttle body to remove any oil deposits. See TSB 86-20-6.

5. Install new oil tube/dipstick and calibrate engine oil level. See TSB 87-7-23.

6. Reset the throttle body hardstop (idle speed) to 625 +/- 25 RPM. Use the 1986 Engine/Emission Diagnosis Shop Manual, Volume H, page 4-45 (TSB 86-19-15, insert) revised procedure.

PART NUMBER PART NAME CLASS

E5TZ-6079-C Gasket Kit A
E6TZ-6754-F Oil Tube Assembly C
E7TZ-6750-G Oil Dipstick C
N605812-S2 Bolt - Package of 4 S
D9AZ-19579-B Carburetor and AM
Combustion Cleaner

OTHER APPLICABLE ARTICLES: 87-7-23, 86-20-6, 86-19-15
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
OPERATION: SP870818A
TIME: 6.8 Hrs.
DLR. CODING: Basic Part No. 6750 - Code: 85