Topaz L4-140 2.3L CFI (1985)
Hall Effect Sensor: Customer Interest
Engine - No Start/Idle Rough/Spark Knock
Article No. 85-9-22
NO START - 2.3L HSC
IDLE ROUGH - 2.3L HSC COLD
SPARK KNOCK - 2.3L HSC - COLD
FORD 1984-1985 TEMPO
LINCOLN-MERCURY 1984-1985 TOPAZ
The above concerns can be caused by the distributor Hall Effect sensor. When the above concerns occur only
at cold tempertures and the engine starts and run satisfactorily when warm, use the first diagnostic procedure. If the concern is no start, use the second
procedure.
If a T.F.I. is removed from the distributor and the stator connector is soft or mushy, replace the stator.
ROUGH IDLE OR SPARK KNOCK WHEN COLD, OK WHEN WARM
TEST PROCEDURE
TEST RESULT
TEST RESOLUTION
TEST 1
NOTE:
This procedure should be performed if the cusNOTE: The stator conditomer complains of a rough idle or spark knock on a tion must
exist when test
cold engine only (i.e. during the initial engine warm-
is performed. If not, the
up period after a long engine-off soak).
test is not conclusive.
Step 1.
Cold soak the vehicle.
NOTE:
This procedure must be performed with the vehicle at or below the temperature where symptom occurs, except as noted.
Step 2.
Key in "OFF" position.
Step 3.
Disconnect the SPOUT connector.
Step 4.
Attach the negative (-) VOM lead to the distributor
base.
Step 5.
Start the engine and measure the battery voltage at
(positive + VOM lead to battery positive terminal) 1200- 1500 RPM.
Figure 20 - Voltage Measurement
Step 6. Measure the voltage on the TFI module side of the
SPOUT connector at 1200-1500 RPM (Figure
Yes
Go to Test 2
20).
Step 7. Is the voltage at the TFI connector greater than 40% of
No
Replace the stator
the battery voltage? (.4 X's Step 5)
assembly.