Thunderbird L4-140 2.3L SOHC Turbo (1984)
Air Flow Meter/Sensor: All Technical Service Bulletins
Engine - Oil Consumption/Detonation/Rough Idle/Stalling
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OIL CONSUMPTION - 2.3L OHC TURBO
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DETONATION - 2.3L OHC TURBO
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IDLE - ROUGH AND ROLL - 2.3L OHC TURBO
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STALL - DURING DECEL - 2.3L OHC TURBO
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HESITATION - DURING ACCELERATION - 2.3L OHC TURBO
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POOR PERFORMANCE - 2.3L OHC TURBO
Article No. 88-3-11
FORD:
1983-84 MUSTANG 1983-87 THUNDERBIRD
LINCOLN-MERCURY: 1983-84 CAPRI 1983-86 COUGAR
ISSUE:
Oil consumption, detonation, rough idle, stalling on decel and poor performance may be caused by oil entering the vane meter and throttle
body through the air inlet tube that connects the turbocharger and the vane meter air outlet. This may be caused by one or more of the
following:
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High engine oil level causing oil foaming.
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Excessive crankcase pressure caused by an interrupted PCV (Positive Crankcase Ventilation) flow.
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Incorrect location of the speed control system vacuum hose nipple at the PCV closure tube (TSB 86-10-8).
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Restriction in the vent tube connector (TSB 84-16-23).
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Ineffective oil separator (TSB 84-6-18).
ACTION:
To correct this, use the following service procedures to keep oil from collecting in the service ribs of the air inlet tube and entering the
vane meter and throttle body. Clean the air vane meter to remove any oil residue.
1983-84 Model Year Vehicles
1.
Check to see if rocker arm cover has a rear external oil separator. If not, then install oil separator E5SZ-6A785-A. Refer to TSB 84-6-18.
2.
Check to see if vent tube connector on turbocharger inlet elbow is correct size. Refer to TSB 84-16-23.
3.
If vehicle is equipped with speed control, a new turbocharger air inlet elbow (E6SZ-9C674-A) must be installed before going to Step 4 of this
procedure. Refer to TSB 86-10-8.
4.
If the above corrections do not correct oil accumulation in the ribs of the air inlet tube, add the following parts.
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Rocker Arm Cover - E7SZ-6582-A
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Grommet - E7AZ-6A892-A
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Screw-in Oil Fill Cap - E7DZ-6766-A
NOTE:
Clean the vane air flow meter after all of the above corrections have been made. Refer to the vane air meter cleaning procedure on page 29 of
this TSB.
1985-86 Model Year Vehicles
1.
If vehicle is equipped with speed control, a new turbocharger air inlet elbow (E6SZ-9C674-A) must be installed. Refer to TSB 86-10-8.
2.
Check crankcase to see that oil fill is not over five (5) quarts (4 quarts plus 1 quart for filter change). If it is overfilled, then the "Max Fill" mark
and wording on oil dipstick is probably incorrect. Overfilling the crankcase will cause oil to be ingested into the air intake system. Correct this by
draining engine oil and throw away the old oil filter. Refill with exactly four (4) quarts plus one (1) quart for filter change. Install the new
recalibrated dipstick (E7SZ- 6750-B). Refer to TSB 86-10-8.
3.
If the above corrections do not correct oil accumulation in the ribs of the air inlet tube, the following parts should be added.
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Rocker Arm Cover - E7SZ-6582-A
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Grommet - E7AZ-6A892-A
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Oil Separator - E6ZZ-6A785-A
