Cougar/XR7 L4-140 2.3L SOHC Turbo (1983)
Ignition Control Module: Customer Interest
Ignition System - Weak/No Spark
Article No. 86-2-20
IGNITION SYSTEM - TFI - WEAK OR NO SPARK - DIAGNOSTIC TIP
FORD 1982-86 ESCORT, EXP; 1983-86 THUNDERBIRD, LTD, CROWN VICTORIA, MUSTANG; 1984-86 TEMPO; 1986 TAURUS
LINCOLN-MERCURY 1982-83 LN7; 1982-86 LYNX; 1983-86 COUGAR, MERCURY, GRAND MARQUIS, CONTINENTAL, MARK VII,
LINCOLN; 1984-86 TOPAZ; 1986 SABLE
LIGHT TRUCK 1983-86 EAND F-SERIES, RANGER, BRONCO; 1984-86 BRONCO II; 1986 AEROSTAR
CALIBRATIONS: All with TFI Systems
If the TFI module fails and causes a short to ground, the primary winding of the ignition coil can be damaged. The TFI diagnostic procedure published in
the Shop Manual will not identify this condition.
When servicing a weak or no spark condition, perform the following:
1.
Check for spark using the procedures found in the Manual Information, Computerized Engine, Quick Test Section, Test 1.
2.
If there is no spark, test the coil primary resistance using Rotunda digital volt-ohmmeter 007-00001, as shown.
3.
If the coil primary resistance is O.K., continue with the diagnostic procedure in Test 1.
4.
If the coil primary resistance is not O.K., replace the coil and recheck for weak or no spark. If the spark is now O.K., the problem is resolved.
5.
If the spark is still NOT O.K., continue with normal diagnostic procedure in Test 1.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"
Wiring Harness
TFI-IV
Part 2
Test 5
TEST EQUIPMENT: VOM, STRAIGHT PIN
TEST PROCEDURE
1.
Separate wiring harness connector from ignition module. Inspect for dirt, corrosion, and damage.
NOTE:
PUSH connector tabs to separate.
2.
Disconnect wire at S terminal of starter relay.
3.
Attach negative (-) VOM, Rotunda Number 007-00001, lead to distributor base.
4.
Measure battery voltage.