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Everything You Need To Know About 1979-1993 Foxbody Mustangs

Written By: Connor MC

Welcome to the ultimate Foxbody Mustang specification page. Use the links to the left (above if you're on mobile) to quickly jump to a particular specifications section.

American Muscle

Foxbody Mustang Engine Specifications

Look below for all the information you need to know about the V8-equipped 1979-93 Foxbody Mustang. Full 5.0 engine and block specifications for all 5.0L V8 Foxbody Mustangs; from assembly materials to camshaft specifications, we have it all.

1987-1993 Foxbody 5.0 SEFI V8 Engine Part Diagram

1979-1993 5.0L V8 Foxbody Mustang Power Ratings

YearEngine (cu/L)Horsepower @Torque @ (ft-lb)CRIntake
1979302/5.0L140 @ 3600250 @ 18008.4:12bbl carb
1980255/4.2L118 @ 3800193 @ 22008.8:12bbl carb
1981255/4.2L115 @ 3400195 @ 16008.2:12bbl carb
1982255/4.2L111 @ 3400194 @ 16008.2:12bbl carb
1982302/5.0L157 @ 4200240 @ 24008.3:12bbl carb
1983302/5.0L HO175 @ 4200245 @ 24008.3:14bbl carb
1984302/5.0L HO175 @ 4200245 @ 24008.3:14bbl carb
1985302/5.0L HO210 @ 4400270 @ 32008.4:14bbl carb
1986302/5.0L HO200 @ 4000285 @ 30009.2:1SEFI SD
1987302/5.0L HO225 @ 4200300 @ 32009.0:1SEFI SD
1988302/5.0L HO222 @ 4200300 @ 32009.0:1SEFI SD*
1989302/5.0L HO220 @ 4200300 @ 32009.0:1SEFI MAF
1990302/5.0L HO220 @ 4200300 @ 32009.0:1SEFI MAF
1991302/5.0L HO220 @ 4200300 @ 32009.0:1SEFI MAF
1992302/5.0L HO220 @ 4200300 @ 32009.0:1SEFI MAF
1993302/5.0L HO205 @ 4200275 @ 30009.0:1SEFI MAF
1993 Cobra302/5.0L GT40235 @ 4600280 @ 40009.0:1SEFI MAF

*California '88 5.0's were MAF
**Output ratings from 1987-1993 had slight variations due to slight changes over the years. Ford did not change their rating for these year to year ratings. Above is actual output. 205hp is the most realistic and closest to actual output.

1987-1993 5.0L V8 Foxbody Mustang Engine and Component Weights

ComponentWeight (~lbs)
Engine Assembly540
Engine Block126
Cylinder Head43
Intake Manifold37
Connecting Rod1.2

5.0L Engine Block SpecificationsAnchor

Displacement4942 cc, 4.94L; 301.6 cu in.
Cylinder Bore4.00 in; 101.6 mm
Main Bearing Bore2.2486 in; 57.1144 mm
Lifter Bore.876 in; 22.35 mm
Distributor Shaft Bore.4532 in; 11.51 mm
Bore Centres4.38 in; 111.24 mm
Deck Height8.206 in; 208.4 mm
Deck Length

20.84 in; 529.34 mm

1979-1993 5.0L V8 Foxbody Mustang Block Cast Numbers

YearPart number

1979-1993 5.0L V8 Foxbody Mustang Crankshaft InfoAnchor

YearPartAssemblyMain Bearing JournalsRod Bearing Journals
1979D9TE-6303-EACast2.2486 in2.21232 in
1982-85E1AE-6303-AACast2.2486 in2.21232 in
1986-93E2AE-6303-EACast2.2486 in2.21232 in

1979-1993 5.0L V8 Foxbody Mustang PistonsAnchor

1979-84Sand cast aluminiumD9OE-6110-AA
1985Forged aluminiumE4ZE-6110-SB
1986Forged aluminiumE6ZE-6110-BA
1987-92Forged aluminiumE7ZA-6110-CA
1993Hypereutic aluminium (cast)F3ZE-6110-AA

1979-1993 5.0L V8 Foxbody Mustang Cylinder Head SpecsAnchor

YearVolumeIntakeExhaustPart Number
197967.5-70.5 cc1.782 in1.46 inD9AE-6049-AA
1980-8153.6-56.5 cc1.680 in1.46 inUnknown
1982-8467.5-70.5 cc1.782 in1.46 inUnknown
198567.5-70.5 cc1.782 in1.46 inE5AE-6049-CA
198662.9-65.9 cc1.782 in1.46 inE6AE-6049-AA
1987-9360.6-63.6 cc1.782 in1.46 inE7TE-6049-PA

1985-1993 5.0L V8 Foxbody Mustang Camshaft Specs (Roller Rockers)


Lift (in)

Duration (°)

Event Phasing (°)


Lobe Centre

Part Number

1985-88 HO

Int: .278
Exh: .278

Int: 266
Exh: 266

IO: 16
IC: 48
EO: 57
EC: 19

°: 35
Factor: 13.58

Int: 115
Exh: 115



Int: .278
Exh: .278

Int: 276
Exh: 266

IO: 20
IC: 76
EO: 67
EC: 19

°: 39
Factor: 19.51

Int: 116
Exh: 115



Int: .278
Exh: .278

Int: 276
Exh: 266

IO: 20
IC: 76
EO: 67
EC: 19

°: 39
Factor: 19.51

Int: 116
Exh: 115


1993 Cobra

Int: .282
Exh: .282

Int: 270
Exh: 270

IO: 19
IC: 71
EO: 75.5
EC: 14.5

°: 33.5
Factor: 15.24

Int: 115
Exh: 121.5


IO = intake opening BTDC, IC = intake closing ABDC, EO = exhaust opening BBDC, EC = exhaust closing ATDC

1986-1993 5.0L V8 Foxbody Mustang Intake InfoAnchor

YearDescriptionPart NumberMatching Gasket
1986 HOSEFI, inline oval runnersF0VZ-9424-AFEL-PRO Part #MS93334
1987-93 HOSEFI, inline oval runnersF0ZZ-9424-AFEL-PRO Part #MS93334
1993 CobraSEFI, staggered round runnersF3ZZ-9424-CFEL-PRO Part #MS93334
1986-93 HOSEFI, inline oval runnersE6SZ-9424-CFEL-PRO Part #MS93334
1993 CobraSEFI, staggered round runnersF3ZZ-9424-CFEL-PRO Part #MS93334

1986-1993 5.0L V8 Foxbody Mustang Throttle Body InfoAnchor

YearTypeThrottle Body DiameterFlow Sensor DiameterAir Flow
1986SD58 mmNA541 cfm
1987-88SD60 mm55 mm580 cfm
1989-93MAF60 mm55580 cfm
1993 CobraMAF65 mm70638 cfm

75mm TB will suffice for pretty much any 5.0L engine. Bigger is not much use.

Foxbody Cylinder Head Bolt Torque Specs

YearEngineTorque (ft-lbs)
1979-19932.3L 4-CylinderFirst step 50-60 ft-lbs, then second step 80-90 ft-lbs
1979-1992, 1993 non-flanged bolts5.0L V8First step 55-65 ft-lbs, then second step 65-72 ft-lbs
1993 flanged bolts5.0L V8First step 25-35 ft-lbs, second step 45-55 ft-lbs, then third step 75-85 ft-lbs
Foxbody Cylinder Head Bolt Tightening Sequence

Foxbody Mustang Transmission Specifications

Throughout the production run of the Foxbody Mustangs (1979-1993), Ford implemented 4 different transmissions - 3 automatics and 1 manual. Use the links below to navigate the specifications on the SROD, AOD and C4/C5 automatic transmissions as well as the Borg-Warner (now Tremec) T5.

Foxbody Drivetrain and Transmission Diagrams

1979-1993 Foxbody Mustang Factory Drivetrain Specs
AOD Cutaway Diagram
C4/C5 Cutaway Diagram
T5 Cutaway Diagram

Foxbody AOD, C4/C5, SROD Automatic Transmissions

1979-1983 1/2 SROD Transmission Gear Ratios
1979-1982 C4/C5 Transmission Specs
AOD Automatic Transmission Gear Ratios
AOD Automatic Transmission Torque Converter & Stall Speeds

Foxbody T5 Transmission

T5 5 Speed Transmission Specs
Worldclass vs NWC T5 and T5 Limit
Clutch Specifications
Foxbody TKO-500 and TKO-600 Swap
Foxbody T56 Swap

1979-1993 Mustang Factory Drivetrain Specs

YearEngineTransmissionRing Gear SizeStandard Gear RatioOptional Gear Ratio
19795.0 LSROD 4spd
C-4 3spd auto
7.5 in
7.5 in
19804.2 LC-4 3spd auto7.5 in2.26:1NA
19814.2 LC-4 3spd auto7.5 in2.26:13.08:1 Trak-Lok
19824.2 LC-5 3spd auto7.5 in2.73:13.08:1 Trak-Lok
1983 1/2
5.0 LSROD 4spd
T5 5spd
7.5 in3.08:1 Trak-Lock
3.27:1 Trak-Lok
19845.0 LT5 5spd7.5 in3.08:1 Trak-Lok3.27:1 Trak-Lok
1984-85 (CFI)
1985 4bbl
5.0 LAOD 4spd auto
T5 5spd
7.5 in3.27:1 Trak-Lok
2.73:1 Trak-Lok
3.08:1 Trak-Lok
19865.0 LAOD 4speed auto8.8 in3.27:1 Trak-LokNA
1986-935.0 LT5 5spd8.8 in2.73:1 Trak-Lok3.08:1 Trak-Lok
19875.0 LAOD 4speed auto8.8 in2.73:1 Trak-Lok3.08:1 Trak-Lok
1988-935.0 LAOD 4speed auto8.8 in2.73:1 Trak-Lok3.27:1 Trak-Lok
1993 Cobra5.0 LT5 5spd8.8 in3.08:1 Trak-LokNA

SROD 4 speed Transmission Specs (automatic)

Year1st2nd3rd4thReverseInput Shaft Length
1979-83 1/23.071.721.00.703.077.8 in

C4/C5 Automatic Transmission Gear RatiosAnchor

Year1st2nd3rdReverseFactory Lubricant
1979-19822.461.461.002.18Dexron II, 11 qts

C4/C5 Torque ConverterAnchor

YearRatioStall Speed (rpm)
2.28:1 (CA)

AOD Automatic Transmission Gear RatiosAnchor

Year1st2nd3rd4thReverseFactory Lubricant
1984-19932.401.471.00.6672.00Mercon ATF, 12.3 qts

AOD Automatic Transmission Torque ConverterAnchor

YearRatioStall Speed (rpm)

T5 5 Speed Transmission Specs

Year1st2nd3rd4th5thReversePart NumberTorque Capacity*Factory Lubricant (5.6 pints)
1983 1/22.951.941.341.00.7252.76E3ZR-7003-CA275-295 ft-lbDexron II Series D ATF
19842.951.941.341.00.6252.76E4ZR-7003-DA275-295 ft-lbDexron II Series D ATF
19853.351.931.291.00.6753.15E5ZR-7003-FA305-325 ft-lbDexron II Series D ATF
19863.351.931.291.00.6753.15E6ZR-7003-FA/FB305-325 ft-lbDexron II Series D ATF
1987-893.351.931.291.00.6753.15E6ZR-7003-FB305-325 ft-lbMercon ATF (1988 up)
19893.351.991.331.00.6753.15E9ZR-7003-AA305-325 ft-lbMercon ATF
19903.351.991.331.00.6753.15F0ZR-7003-AA305-325 ft-lbMercon ATF
1991-933.351.991.331.00.6753.15F2ZR-7003-AA305-325 ft-lbMercon ATF

*Lower number was factory rated torque number. Factory meausurements were done at continuous load, not instantaneous. The higher torque rating is what real world application and 3rd parties have discovered the T5 to withstand.

Foxbody T5 Stock Clutch Specifications Anchor

YearClutch DiameterHubMaterialClutch Part #Pressure Plate Part #Load Capacity
1979-198310 in10-spline, 1 1/16 inAsbestosD9ZC-7550-CAD9ZC-7653-DA1455 lbs
198410 in10-spline, 1 1/16 inAsbestosE4ZR-7550-AAE4ZR-7653-AA1540 lbs
198510.5 in10-spline, 1 1/16 inOrganicE5ZR-7550-AAE4ZR-7653-AA1540 lbs
1986-8710.5 in10-spline, 1 1/16 inOrganicE6ZR-7550-AAE6ZR-7653-AA1644 lbs
1988-9310.5 in10-spline, 1 1/16 inOrganicF0ZZ-7550-AAF0ZZ-7563-A1877 lbs ('88)
1770 lbs ('89)
2012 lbs ('90-93)
1993 Cobra10.5 in10-spline, 1 1/16 inOrganicF3ZZ-7550-AF3ZZ-7563-A2124 lbs

Foxbody Mustang Brake Specifications

Even rolling out of the factory, the stock brake setup employed by Ford on the Foxbody Mustang was less than adequate to effectively control the power and speed capable of the accompanying stock 302 cu (5.0L) V8 engine. Comprised of cast-iron, centrally vented rotors up front clamped by single piston calipers, and a basic drum setup in the back, these brakes really weren't up to par to handle even a stock 225HP Foxbody. Listed below are the full sizing and material specifications of the brake systems installed over the Foxbody era.

1979-1993 V8 Mustang Factory Brake Specifications

19791980-811982-861987-931993 Cobra
Front Rotors
FrontDisc, cast-iron ventedDisc, cast-iron ventedDisc, cast-iron ventedDisc, cast-iron ventedDisc, cast-iron vented
Rotor Diameter10.06 in9.31 in10.06 in10.84 in10.84 in
Rotor Thickness0.870 in0.870 in0.870 in1.03 in1.03 in
Rotor Area275.6 sq.in249.8 sq.in275.6 sq.in316 sq.in379.3
Pad CompositionAsbestosSemimetallicSemimetallicSemimetallicSemimetallic
TypeDrum, solid unventedDrum, solid unventedDrum, solid unventedDrum, solid unventedDisc, vented
Diameter9.0 in9.0 in9.0 in9.0 in10.07 in
Width1.73 in1.73 in1.73 in1.73 in0.945 in
Shoe/Pad CompositionAsbestosAsbestosAsbestosOrganicOrganic
Hydraulics1979-831984-861987-93 (2.3L)1987-93 (5.0L)1993 Cobra
Master Cylinder Bore Diameter22.2 mm21.0 mm21.0 mm21.0 mm25.5 mm
Caliper Bore Diameter60.0 mm60.0 mm
SVO: 72.9 mm
60.0 mm60.0 mm72.9 mm front, 45.44 mm rear

Foxbody Mustang Ignition & Fuel System

The factory DuraSpark I and DuraSpark II ignition systems used on the late model Foxbody Mustang was actually an excellent ignition system for the time. Read below for all the information you need regarding the ignition and fuel system on Foxbody Mustangs. HO firing order, ignition timing, spark plug gap, fuel pump and injector specifications, it's all below.

Ford 5.0 V8 Cylinder Location
Ford V8 Firing Order
Foxbody Mustang Spark Plugs
Foxbody Mustang Fuel Pumps
Ford Fuel Injector specifications
1979-1985 Foxbody Mustang Ignition Timing
1986-1993 Foxbody Mustang Ignition Timing

1979-1993 Ford V8 Cylinder Banks (facing engine head on)
Left Bank | Right Bank
4 | 8
3 | 7
2 | 6
1 | 5

1979-1993 Ford V8 Firing OrderAnchor
1979-93 truck V8's (non-HO) and 4.2 L V8: 1-5-4-2-6-3-7-8
1982-93 5.0 L HO V8: 1-3-7-2-6-5-4-8

Foxbody 5.0L Firing Order

1979-1993 V8 Foxbody Mustang Spark PlugsAnchor

YearEnginePart NumberGap
19795.0 L
5.0 L (California)
0.050 in
0.060 in
19804.2 LASF-420.050 in
19814.2 LASF-420.050 in
19824.2 LASF-520.050 in
1983-855.0 L 4bbl
5.0 L CFI
0.044 in
0.050 in
19865.0 L HOAWSF-52/440.050 in
1987-935.0 L HOASF-420.054 in
1993GT40 CobraAWSF-42C0.050 in

1979-1993 V8 Foxbody Mustang Fuel Pumps (factory)Anchor

  • Carburated Mustang (mechanical fuel pump): 1979:6.5 psi, 1982:8.5 psi
  • CFI Mustang: twin electric: 60 lph @ 39 psi
  • SEFI Mustang: 88 lph @ 39 psi

Ford Factory Fuel Injector SpecificationsAnchor

FlowColorFactory ApplicationInjector Power Capacity
14 lb/hrGreyNon Mustang 5.0 L V8's (trucks, not HO)Don't bother. Change them
19 lb/hrYellow5.0 L HO V8 Mustang330 HP
24 lb/hrLight blueCobra GT40 (93-95)400 HP
30 lb/hrRed2.3 L turbo (early models)500 HP
35 lb/hrBrown or dark blue2.3 L turbo SVO Mustang600 HP

1979-1985 Foxbody Mustang V8 Ignition Timing Anchor

YearInitial Timing (deg BTC)Centrifugal Advance (deg @ rpm)Vaccuum Advance (deg @ in. Hg)
1979-81120.0 @ 1250rpm
8.0 @ 2150rpm
14.5 @ 5000rpm
0.00 @ 3.5
14.0 @ 8.0
24.0 @ 13
1982120.0 @ 1200rpm
10.0 @ 2000rpm
19.0 @ 5000rpm
0.00 @ 3.5
14.0 @ 8.0
24.0 @ 13
1983100.0 @ 1400rpm
9.0 @ 2000rpm
18.0 @ 5000rpm
0.00 @ 4.5
11.0 @ 8.0
20.0 @ 12.5
1984100.0 @ 1400rpm
11.0 @ 2200rpm
20.0 @ 5000rpm
0.00 @ 4.5
10.5 @ 8.0
20.0 @ 12.5
1985120.0 @ 1300rpm
11.0 @ 2200rpm
20.0 @ 5000rpm
0.00 @ 4.5
11.5 @ 8.0
20.0 @ 12.5

1986-1993 Foxbody Mustang V8 Ignition Timing Anchor
Simply add the amount of your initial timing to any point along the curve and you'll have the total timing for that point. For example if your running an A9L computer and 15 degrees initial timing and you want to know how much total timing you have at 2600 rpm. You would simply add the 15 initial to the 22.5 shown on the chart for a total of 37.5 degrees.

ECU1000 rpm1800 rpm2600 rpm3500 rpm5000 rpm
A9L8 °18.5 °22.5 °22 °26 °
A9P21.25 °21.25 °27.25 °26 °30.75 °
X3Z (Cobra)8 °18.5 °22.5 °22 °25 °

Foxbody VIN Decoder

The VIN on any vehicle is a very useful line of characters and numbers. It tells us the year, assembly plant, body type and engine option that the car was factory fitted with. Below is how to decode these magical strings.

1979-1980 Mustang VIN:
ex: 9F04F100001 - 11 characters

CharacterSignificanceCrack the code
1stYear9 = 1979, 0 = 1980
2ndAssembly plantF = Dearborn, R = San Jose
3rd & 4thBody model02/04 = 2dr notchback, 03/05 = 3dr hatchback
5thEngineF = 5.0L 2bbl, D = 4.2L 2bbl
6th to 11thProduction numberx Mustang produced for year

1981-1993 Mustang VIN:
ex: 1FABP27M7EF100001 - 17 characters

CharacterSignificanceCrack the code
1st to 3rdWorld manufacturer1FA = FMC, passenger car
4thRestraint systemB = Active manual seat belt, C = Active seat belts airbag
5thPassenger carP = Passenger car
6th & 7thBody model*10 & 26 (L,GL,GLX), 12 (Ghia), 40 (LX, LX 5.0) = 2dr notchback
16 & 28 (GL,GT,GLX,L,LX), 41 (LX,LX 5.0), 42 (LX 5.0, GT) = 3dr hatchback
27 (GLX,GT,LX), 44 (LX), 45 (GT) = convertible
8thEngineD = 4.2 2bbl, F = 5.0L HO 2bbl/4bbl, M = 5.0L HO 4bbl/CFI/SEFI(1987), E = 5.0L HO SEFI, D = GT40
9thCheck digit0-9
10thYearB = 1981,C = 1982,D = 1983,E = 1984,F = 1985,G = 1986,H = 1987
J = 1988,K = 1989,L = 1990,M = 1991,N = 1992,P = 1993
11thAssembly plantF = Dearborn, R = San Jose
12th to 17thProduction numberx Mustang produced

* Body style codes depend on what body style was available for corresponding year.
ex: 27 = convertible, but GLX was not used for later years, thus if you have an 88, body code = 27, it can't be GLX.

Foxbody Mustang Technical Service Bulletins

Listed below are some full-text Ford technical service bulletins issued for the Mustang from 1987-1993. This is not by any means a complete list.

1987-1993 Foxbody Mustang TSB's

Article No.TitleDescriptionDownload
95-2-2Air ConditioningO-ring removal from spring lock coupler.95-2-2
96-15-6Air ConditioningFiltering system, flushing, tracer dye, leak test etc.96-15-6
96-17-10Air ConditioningUSe of R-12 refigerant and substitutes.96-17-10
95-14-4Ball JointsBall joint replacement procedure.95-14-4
90-22-6Brake SquealOccasional or intermittent squeal from brakes.90-22-6
94-25-2BrakesBrake rotor machining specifications, information and availability.94-25-2
95-6-2BrakesRougness during application95-6-2
93-24-1Bumper Cover Repair/MaterialsBumper cover materials and repair procedure.93-24-1
94-8-1BumpersBumper isolater and bracket assembly, replacement procedure94-8-1
93-24-10Dashboard LightsDimly lit or malfunctioning dash and warning lights.93-24-10
92-18-6EngineEngine: 5.0L
Premature wear on thrust bearing or crankshaft.

Metal-to-metal sound, AOD

AOD interference with torque converter & flywheel bolts

96-10-7FuelCalifornia fuel requirements.96-10-7
94-8-9Fuel SystemMotorcraft fuel injector cleaner - repair parts and service tips.94-8-9
93-26-1Glass, Rear DefrosterInoperative rear glass defroster93-26-1
90-18-3No charge - Battery Discharged - Fuel Pump Noise
90-1-9Oil Consumption (5.0L EFI)Details potential causes for excessive oil consumption.90-1-9
94-24-4PaintPaint and sheet metal preparation.94-24-4
96-1-1SteeringPower rack and pinion, revised info for tie rod installation.96-1-1
96-22-1Windshield, Interior GlassHealth concerns over fogging of windshield and interior glass.96-22-1
96-24-6WiringElectric diode identification and replacement.96-24-6

Foxbody Mustang EEC-IV Error Codes

If there is an issue with your Foxbody Mustang (engine related), a good place to start is to check if the EEC-IV computer has registered any error codes. There are two ways to do so:

  1. Code scanner: You can buy a code scanner from almost any auto parts store, just verify that it can indeed read the error codes from Foxbody Mustangs. Plugin the code scanner to VIP/DLC connector harness in the engine bay (right-hand, driver side for 86-93) and read out any error codes, if there are any.
  2. Test light: For the procedure on how to pull the error codes from a Foxbody Mustang EEc-IV equipped car, please refer to: DIY KOEO/KOER/Cylinder Balance Self-Test Procedure

Listed below are the possible error codes thrown by the Mustang EEC-IV computer. Accompanied with each code is the potential reason why an error has occured. Legend: O = Ignition On (accessory), R = Engine Running, C = Continuous Memory

CodeTest ConditionCause
11O,R,CSystem OK, testing complete
12RIdle speed control out of specified range
13O,R,CNormal idle not within specified range
14O,CIgnition profile pickup erratic
15OROM test failure
15CPower interrupt to computer memory
16RErratic idle, oxygen sensor out of range or throttle not closing
17RCurb idle out of specified range
18RSPOUT circuit open
19ONo power to processor
19RErratic idle speed or signal
21O,RCoolant temperature out of specified range
21O,R,CCoolant temperature sensor out of specified range
22O,R,CMAP sensor out of specified range
23O,R,CThrottle position signal out of specified range
24O,RAir charge temperature low
25O,RMass Air Flow sensor or circuit
27CVehicle Speed Sensor or circuit
280,RVane air temperature sensor or circuit
29CNo continuity In Vehicle Speed Sensor circuit
31O,R,CCanister or EGR valve control system
32O,R,CCanister or EGR valve control system
33R,CCanister or EGR valve not operating properly
34O,R,CEVP voltage above closed unit
35O,R,CEGR pressure feedback, regulator circuit
38CIdle control circuit
39CAutomatic overdrive circuit
41COxygen sensor signal
41RLean fuel mixture
42R,CFuel mixture rich
43CLean fuel mixture at wide open throttle -
43REngine too warm for test
44RAir management system inoperative
45RThermactor air diverler circuit
46RThermactor air bypass circuit
47RLow flow of unmetered air at idle
48RHigh flow of unmetered air at idle
49CSPOUT signal defaulted to 1 0-degrees
51O,CCoolant temperature sensor out of specified range
52O,RPower steering pressure switch out of specified range
53O,CThrottle Position Sensor input out of specified range
54O,CVane air flow sensor or air charge temperature sensor
55RCharging system under specified voltage (1984 through 1988)
55ROpen ignition key power circuit (1984 through 1988)
56O,R,CMass Air Flow sensor or circuit
57CTransmission neutral pressure switch circuit
58OCFI - idle control circuit; EFI - vane air flow circuit
58RIdle speed control motor or circuit
58CVane air temperature sensor or circuit
59O,CTransmission throttle pressure switch circuit
61O,CCoolant temperature switch out of specified range
620Transmission circuit fault
63O,CThrottle Position Sensor or circuit
64O,CAir Charge Temperature (ACT) sensor
65CFuel control system not switching to closed loop
66O,CNo Mass Air Flow sensor signal
67O,R,CNeutral drive switch or circuit
67CAir conditioner clutch switch circuit
69O,CVehicle Speed Sensor or circuit
72CSystem power circuit, electrical interference
72RNo Manifold Absolute Pressure or Mass Air Flow sensor signal fluctuation
73O,RThrottle Position Sensor or circuit 21
74RBrake on/off ground circuit fault 21
75RBrake on/off power circuit fault 22
76RNo vane airflow change
77RThrottle "goose" test not performed
78CPower circuit 1
79OAir conditioner clutch circuit
81OThermactor air circuit
82OThermactor air circuit, integrated controller circuit
83OEGR control circuit (four-cylinder models oeM
83OCooling fan circuit (V6 models only)
83O,CLow speed fuel pump relay (1984 through 1988 models)
83O,CEGR solenoid or circuit (1989 and later models)
84O,REGR control circuit
85O,RCanister purge circuit or transmission shift control circuit
85CExcessive fuel pressure or flow
85CCanister purge circuit
86CLow fuel pressure or flow
87O,R,CFuel pump circuit D2
88OIntegrated controller
89OLock-up solenoid
91R,COxygen sensor problem, fuel pressure out of specified range or injectors out of balance
92RFuel mixture rich, fuel pressure high
93OThrottle Position Sensor or circuit D
94RSecondary air system inoperative
95O,CFuel pump circuit problem
95RThermactor air diverter circuit
96O,CFuel pump circuit
96RThermactor air bypass circuit
98RRepeat test sequence
99RRepeat test sequence
99RSystem has not learned to control idle speed
111O,R,CSystem Pass
112O,R,CAir Charge Temp (Ad) Sensor circuit below minimum voLtagE/ 254 F
113O,CAir Charge Temp (ACT) Sensor circuit above maximum voltagE/ -40 F
114O,RAir Charge Temp (ACT) out of self test range
116O,RCoolant Temp (ECT) out of self test range
117O,RCoolant Temp (EdT) Sensor circuit below minimum voltage/ 254 F
118O,CCoolant Temp (EdT) Sensor circuit above maximum voitage/ -40 F
121O,CClosed Throttle Voitage higher or lower than expected
122O,R,CThrottle Position (TP) Sensor circuit below minimum voltage
123O,CThrottle Position (TP) Sensor circuit above maximum voltage
124O,CThrottle Position (TP) Sensor voltage higher than expected
125CThrottle Position fTP) Sensor voltage lower than expected
126CBP Sensor higher or lower than expected
129O,R,CInsufficient Mass Air Flow (MAE) change during Dynamic Response Test
144CNo Oxygen Sensor (HEGO) Switches detected
157CMass Air Flow (MAE) Sensor circuit below minimum voltage
158O,CMass Air Flow (MAE) Sensor circuit above maximum voltage
159O,RMass Air Flow (MAE) Sensor out of self test range
167RInsufficient Throttle Position change during Dynamic Response Test
171CFuel system at adaptive limits, Oxygen Sensor (HEGO) unable to switch
172R,CLack of Oxygen Sensor (HEGO) Switches, indicates lean
173R,CLack of Oxygen Sensor (HEGO) Switches, indicates rich
179CFuel system at lean adaptive limit at part throttle, system rich
181CFuel system at rich adaptive limit at part throttle, system lean
182CFuel system at lean adaptive limit at idle, system rich
183CFuel system at flch adaptive limit at idle, system lean
184CMass Air Flow (MAE) higher than expectec
185CMass Air Flow (MAE) lower than expected
186CInjector pulse width higher than expected
187CInjector pulse width lower than expected
211CProfile Ignition Pickup (PIP) circuit fault
212CIgnition module circuit failure - SPOUT circuit grounded
213RSPOUT circuit
214CCylinder Identification (CID) circuit failure
215CEEC Processor detected Coil 1 primary circuit failure
216CEEC Processor detected Coil 2 primary circuit failure
218CLoss of ignition Diagnostic Monitor (1DM) signal-left side
222CLoss of Ignition Diagnostic Monitor (1DM) signal-right side
223CLoss of Dual Plug Inhibit (DPI) control
224CErratic Ignition Diagnostic Monitor (1DM) input to processor
225RKnock riot sensed during Dynamic Response Test
327O,R,CEVP circuit below minimum voltage
328O,R,CEGR "closed valve" voltage lower than expected
332R,CInsufflcjent EGR flow detected
334O,R,CEGR closed valve voltage higher than expected
337O,R,CEVP circuit above maximum voltage
341OOctane Adjust Service Pin in use
411RCannot control RPM during KOER low rpm check
412RCannot control rpm during KOER high rpm check
452CIsufflcient input from Vehicle Speed Sensor (VSS)
511OEEC Processor Read Only Memory (ROM) test failure
512CEEC Processor Keep 4Jive Memory (KAM) test failure
519OPower Steering Pressure Switch (PSPS) circuit open
521RPower Steering Pressure Switch (PSPS) circuit did not change states
522OVehicle not in PARK or NEUTRAL during KOEO
528CClutch Switch Circuit failure
536R,CBrake On/Off (BOO) circuit failure I not actuated during KOER
538RIsuffIcient RPM change during KOER Dynamic Response Test
539OAC On/Defrost ON during KOEO
542O,CFuel Pump secondary circuit failure
543O,CFuel Pump secondary circuit failure
556O,CFuel Pump Relay primary circuit failure
558OEGR Vacuum Regulator (EVR) circuit failure
5640ElectrOD FAN( EDF) circuit failure
565OCanister Purge (CANP) circuit failure
566O3-4 Shift Solenoid circuit failure
629OConverter Clutch Control circuit failure
998O,RHard Fault present

Legend: O = Ignition On (accessory), R = Engine Running, C = Continuous Memory

How do I Check the Engine Diagnostic Codes on My Foxbody?

Believe it or not, it is possible to check your Foxbody Mustang’s error codes without using a fancy or specialized automotive scanner. For 1986-1988 Mustangs, all you need is a test light or analog voltmeter and a couple of small gauge jumper wires.

On the driver side towards the back of the engine bay, you need to identify the VIP/DLC connector and jump the #2 SIGRTN (signal return) and STI (self test port) together (unfolding a big paper clip will work). Connect a test light or analog voltmeter to the battery and the negative lead to the STO (self test output) port. The ECU will then send two-digit codes, indicated by light flashes (each digit is separated by a 2-second pause, and each code is separated by a 4-second pause), which can then be looked up in a code chart to understand their meaning.

Instead of using a test light or voltmeter, 1989-1993 Foxbody Mustang owners can use the check engine light (it will flash with the codes). For more information on specific codes, refer to the above chart.

Foxbody Fluid Capacities and Torque Ratings

See below for basic Foxbody 5.0L V8 engine fluid capacities and general bolt torquing information.

Torque Lists and Diagrams
Foxbody Mustang 5.0L torque ratings diagram

Engine Oil

EngineCapacityOil Type*
2.3 Non-turbo, All V6 & V8's4 qts
5 qts with filter change
10W-30 (0 deg C)
5W-30 (below 0°C)
2.3 turbo4.5 qts
5.5 qts filter change
10W-30 (0 deg C)
5W-30 (below 0°C)

Foxbody Fuel Capacity (all engines)

YearTank CapacityMinimum Grade
1979-9315.4 gal, 60 L87

General Torque Specifications

ApplicationTorqueAdditional Info
Wheel Lugs80-105 ft-lbs1979-1993
Spark Plugs5-10 ft-lbs
10-15 ft-lbs
10-15 ft-lbs
5-11 ft-lbs
10-15 ft-lbs
5-10 ft-lbs
4 cyl
2.8L V6
Inline six
3.8L V6
79-87 V8
88 on V8
Oil pan drain plug21-38 ft-lbs
15-25 ft-lbs
2.8L V6
All other engines
Intake Manifold12-18 ft-lbsSequence: Start with the inner bolts, and change diagonally on each bolt (hand tighten first). Torque in the same sequence.

Foxbody Weight Breakdown

  • LX Manual Coupe - 3,037 lbs
  • LX Manual Hatchback - 3,102 lbs
  • LX Manual Convertible - 3,238 lbs
  • LX Automatic Coupe - 3,097 lbs
  • LX Automatic Hatchback - 3,162 lbs
  • LX Automatic Convertivble - 3,298
  • GT Manual Hatchbak - 3,191 lbs
  • GT Manual Convertible - 3,327 lbs
  • GT Automatic Hatchback - 3,251 lbs
  • GT Automatic Convertible - 3,442 lbs
  • 1993 Cobra - 3,255 lbs
  • 1993 Cobra R - 3,143 lbs

Interior Trim Differences By Submodel

  • 1980: Bucket seats, colored interior trim, window and wide body moldings 
  • 1981: minor interior changes, t-tops 
  • 1983: Seat and door trim
  • 1984: Saleen model (different trims altogether), front fascia, grille, flush headlights
  • 1987-1993: exterior moldings, color keyed rear bumper, hood scoop, rocker extensions (GT)
  • 1989: T-top options removed
Fitment includes: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993