Engine - Driveability Concerns TSB Listings
85ford13Article No. 85-13-3
DRIVEABILITY CONCERNS
FORD 1984-85 THUNDERBIRD, LTD, MUSTANG
LINCOLN-MERCURY 1984-85 COUGAR, MARQUIS, CAPRI
This TSB article provides a list of Driveability concerns on 1984-85 3.8L CFI engines by their most probable cause/corrective actions along with referenced applicable TSB articles. Additionally, the complete TSB articles referenced are provided in this special section, pages 11-46.
SYMPTOM CAUSE/CORRECTIVE ACTIONS REFERENCE VEHICLE APPLICATION
Surge - 1. Check/Replace EGR Valve - TSB 85-3-7 1984/85
30/35 MPH Reduced Flow Page 28 T/Bird, Cougar,
LTD, Marquis
2. Check/Repair open in #352 Circuit Shop Manual
(Pin #27 of Processor) Vol. H.
Pinpoint Test Test DD, Page 22-29
3. Check/Repair connector pins (poor Shop Manual crimping) in EVP/Harness Connectors Volume H
Wiggle Test Page 19-10
4. Check/Reset spark plug gap to .054" TSB 85-3-7 (TSB 85-1, Page 33) Page 28
5. Check spark plugs for oil ash deposits TSB 84-16-16
(driver's side) (TSB 85-4, Page 51)
Page 24
6. Check EVP sensor build date TSB 84-21-14-S (TSB 84-26, Page 14) Page 26
7. Check for restricted catalyst TSB 84-16-20 Page 24
Spark Knock on 1. Check/Reset ignition timing to Shop Manual 1984/85 All
Acceleration - decal specification Volume H,
Section 15
Page 15-1
Warm Engine
2. Check for low coolant level Shop Manual Volume H Section 15 Page 15-1
3. Check spark plugs for oil ash deposits TSB 84-16-16-S
(driver's side) Page 24
SYMPTOM CAUSE/CORRECTIVE ACTIONS REFERENCE VEHICLE APPLICATION
Spark Knock on 4. Check for soft/mushy distributor stator TSB 85-9-31
Acceleration connector. Page 38
Warm Engine
(Continued) 5. Install service radiator TSB 84-14-9
(1984 LTD/Marquis A.O.D. only) Page 19
6. Check/Repair EGR solenoid TSB 85-7-13 connections Page 37
7. Retard ignition timing 3~ from decal TSB 84-5-14 specification Page 18
Noise (Mechanical 1. Check/Reset ignition timing to decal Shop Manual 1984/85
- Engine Knock) specification Volume H T/Bird, Cougar
Cold Engine Section 15 LTD, Marquis
Page 15-1 All Except
5-16B-R1 Calibration
2. Replace Processor TSB 85-6-9 Page 29
Bucks/Jerks on 1. Check/Replace MAP sensor TSB 85-12-15 1984/85
Deceleration Page 42 T/Bird, Cougar,
(Trailer Hitching) LTD, Marquis
Idle Rough or 1. Check spark plugs for oil ash deposits TSB 84-16-16-S 1984/85
Idle RPM Drop (driver's side) (TSB 85-4, Page 14) All
Page 24
2. Check for oil in distributor TSB 85-9-31 Page 38
3. Check throttle body gasket and for TSB 85-5-23 other vacuum leaks Page 28
4. Check EVP sensor build date TSB 84-21-14-S TSB 84-26, Page 14) Page 26
5. Check/Repair open in #352 circuit Shop Manual
(Pin #27 of processor) Volume H
Pinpoint Test DD Page 22-29
6. Check/Repair connector pins (poor Shop Manual crimping) in EVP/Harness connectors Volume H
Wiggle Test Page 19-10
7. Check/Replace alternator regulator TSB 84-18-18-S (TSB 85-1 Page 33) Page 25
SYMPTOM CAUSE/CORRECTIVE ACTIONS REFERENCE VEHICLE APPLICATION
Idle Speed 1. Check EVP sensor build date TSB 84-19-12-S 1984/85 All
Increases (TSB 84-25, Pg. 26)
Momentarily and Page 26
Returns to Normal
2. Check/Repair intermittent open in Shop Manual
#352 circuit (Pin #27 of Processor) Volume H
Pinpoint Test DD Page 22-29 and Wiggle Test Page 19-10
Idle Speeds Fast 1. Check idle speed control motor build None 1984/85
(Cold Start Idle date. Replace if build date is All
RPM range) before 3J25
2. Check/Repair short at splice in 14290 TSB 85-13-4 wire harness Page 43
3. Check/Repair short in engine TSB 85-12-14 compartment wire harness Page 41
connectors
4. Check/Repair (clean and grease) TSB 85-13-4 short in self test connector plug Page 43
Idle Speeds Fast 1. Check/Reset throttle stop screw and TSB 84-10-13 1984/85
(750 RPM Range) idle speed control motor Page 18 All
2. Check/Reset cruise control cable if Shop Manual self test code 13 is not present with Volume H
cable disconnected Pinpoint Test KF-19
Page 22-156 and 22-162
3. Check/Repair ground in #119 circuit TSB 84-16-22
(Pin #30 of processor) Page 25
4. Check throttle body gasket and for TSB 85-5-23 other vacuum leaks Page 28
Loss of 1. Check idle speed control motor None 1984/85
Power (inoperative idle tracking switch All
can cause lean drive) build date
Replace if build date is before 3J25
2. Check/Repair open in #295 circuit Shop Manual
#265 circuit (Pin #28 of processor) Volume H
Pinpoint Test KF Page 22-156
3. Check for oil in distributor TSB 85-9-31 Page 38
4. Check for restricted catalyst TSB 84-16-20 Page 24
5. Check/Repair EGR solenoid TSB 85-7-13 connections. Page 37
SYMPTOM CAUSE/CORRECTIVE ACTIONS REFERENCE VEHICLE APPLICATION
Hesitation 1. Check/Reset ignition timing to 10~ Shop Manual 1984/85
BTDC. Vehicle must be tested for Volume H T/Bird, Cougar
Engine Cold Knock after ignition Section 15 LTD, Marquis
timing adjustment. Page 15-1
2. Check/Repair low fuel pressure (fuel TSB 85-13-5 pump, fuel pump circuit, fuel lines) Page 45
3. Check spark plugs for oil ash deposits TSB 84-16-16-S
(driver side) (TSB 85-4, Pg. 51)
Page 24
4. Check/Replace processor (use part TSB 85-6-9 number shown in "cold knock" TSB) Page 29
Misfire During 1. Check spark plugs for oil ash deposits TSB 84-16-16-S 1984/85
Steady Speeds (driver side) (TSB 85-4, Pg. 51) All
Pag e24
2. Check/Repair low fuel pressure (fuel TSB 85-13-5 pump, fuel pump circuit, fuel lines) Page 45
3. Check/Repair/Replace throttle Shop Manual position sensor and circuit Volume H
Pinpoint Test DH Page 22-55
4. Check/Replace distributor cap TSB 84-22-3-S (TSB 84-25, Pg. 26) Page 27
No Start 1. Check/Replace throttle position TSB 84-14-17 1984/85
sensor Page 21 All
2. Check/Replace distributor cap TSB 84-22-3-S (TSB 84-25, Pg. 26) Page 27
3. Check/Replace ignition coil TSB 84-14-18-S (TSB 84-23-1, Pg. 7 Page 23
4. Check/Repair fuel pressure (fuel TSB 85-13-5 pump, fuel pump circuit, fuel lines) Page 45
5. Check distributor hall sensor (stator). TSB 85-7-11
If defective, replace with Page 30
E5PZ-12A112-A (Class A) (Diagnostic
Procedure)
6. Check/Replace TFI (distributor) and TSB 85-11-11
MAP connectors Page 39
SYMPTOM CAUSE/CORRECTIVE ACTIONS REFERENCE VEHICLE APPLICATION
No Start 7. Check for/Repair short at processor/ TSB 85-7-12
(Continued) harness connector Page 36
8. Check for oil in distributor TSB 85-9-20 Page 38
Stalls 1. Check EVP sensor build date TSB 84-21-14-S 1984/85
(TSB 84-26, Pg. 14) All
Page 26
2. Check/Repair open in #352 circuit Shop Manual
(Pin #27 of processor) Volume H
Pinpoint Test DD Page 22-29
3. Check/Repair connector pins (poor Shop Manual crimping) in EVP/harness connectors) Volume H
Wiggle Test Page 19-10
4. Check spark plugs for oil ash deposits TSB 84-16-16-S
(driver's side) (TSB 85-4, Pg. 51)
Page 24
5. Check/Reset throttle stop screw and TSB 84-10-13 idle speed control motor Page 18
6. Check throttle body gasket and for TSB 85-5-23 other vacuum leaks Page 28
7. Check/Replace ignition coil TSB 85-13-2 Page 9
8. Check/Replace alternator regulator TSB 84-18-18-S (TSB 85-1, Pg. 83 Page 25
Stalls on 1. Engage transmission within 30 TSB 84-15-13 1984/85
transmission seconds after start Page 23 All
engagement - cold engine