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12:3012:30, 22 July 2026 Audio RPO codes (hist | edit) [6,953 bytes] Cliff (talk | contribs) (Created page with "'''Audio RPO codes''' are RPO codes used to identify factory radio, speaker, stereo, and sound-system equipment on the Pontiac Fiero. For a complete searchable list of Fiero RPO and option codes, see: * Fiero RPO code list == Overview == Audio RPO codes help identify the radio, speaker system, stereo provisions, or upgraded audio equipment originally assigned to a Fiero. These codes may appear on the Service parts identification label along with pain...")
12:2812:28, 22 July 2026 Wheel RPO codes (hist | edit) [5,915 bytes] Cliff (talk | contribs) (Created page with "'''Wheel RPO codes''' are RPO codes used to identify factory wheel equipment, wheel trim, wheel locks, and related wheel-color information on the Pontiac Fiero. For a complete searchable list of Fiero RPO and option codes, see: * Fiero RPO code list == Overview == Wheel RPO codes help identify the wheels, wheel covers, trim rings, wheel locks, or related wheel equipment originally assigned to a Fiero. These codes may appear on the Service parts identif...")
12:2712:27, 22 July 2026 Interior trim RPO codes (hist | edit) [7,923 bytes] Cliff (talk | contribs) (Created page with "'''Interior trim RPO codes''' are RPO codes and trim-related codes used to identify factory interior colors, seat trim, seat-belt colors, and related interior equipment on the Pontiac Fiero. For a complete searchable list of Fiero RPO and option codes, see: * Fiero RPO code list == Overview == Interior trim codes help identify the original interior color and trim combination assigned to a Fiero when it was built. Trim information may appear on the Serv...")
12:2612:26, 22 July 2026 Paint RPO codes (hist | edit) [8,068 bytes] Cliff (talk | contribs) (Created page with "'''Paint RPO codes''' are RPO codes and paint-related codes used to identify factory exterior paint information on the Pontiac Fiero. For a complete searchable list of Fiero RPO and option codes, see: * Fiero RPO code list == Overview == Paint codes help identify the original exterior color or paint combination assigned to a Fiero when it was built. Paint information may appear on the Service parts identification label as two-digit paint codes, upper...")
12:2412:24, 22 July 2026 Transmission RPO codes (hist | edit) [8,809 bytes] Cliff (talk | contribs) (Created page with "'''Transmission RPO codes''' are RPO codes used to identify factory transmission equipment on the Pontiac Fiero. For a complete searchable list of Fiero RPO and option codes, see: * Fiero RPO code list == Overview == The Pontiac Fiero was available with several factory manual and automatic transaxles. Transmission RPO codes help identify which transmission a car was originally equipped with from the factory. These codes may appear on the Service parts...")
12:2312:23, 22 July 2026 Engine RPO codes (hist | edit) [4,167 bytes] Cliff (talk | contribs) (Created page with "'''Engine RPO codes''' are RPO codes used to identify factory engine equipment on the Pontiac Fiero. For a complete searchable list of Fiero RPO and option codes, see: * Fiero RPO code list == Overview == The Pontiac Fiero was built with two factory engine families: * 2.5L four-cylinder * 2.8L V6 Engine RPO codes help identify which engine a car was originally equipped with from the factory. These codes may appear on the Service part...")
12:2212:22, 22 July 2026 Build/service codes (hist | edit) [7,531 bytes] Cliff (talk | contribs) (Created page with "'''Build/service codes''' are codes found in some Pontiac Fiero enthusiast references, service references, assembly references, or parts-related documents. They should not automatically be treated as RPO codes. == Overview == Build/service codes are different from regular production option codes. While RPO codes identify factory-installed equipment, option packages, paint information, trim information, drivetrain equipment, and other build information on...")
12:2012:20, 22 July 2026 Fiero RPO code list (hist | edit) [21,795 bytes] Cliff (talk | contribs) (Created page with "'''Fiero RPO code list''' is a searchable reference list of RPO codes and option codes associated with the Pontiac Fiero. RPO stands for '''Regular Production Option'''. General Motors used RPO codes to identify factory-installed equipment, options, colors, trims, drivetrain components, packages, and other build information. For general information about RPO codes and the factory label that lists them, see: * RPO codes * Service parts identification labe...")

19:5619:56, 18 July 2026 Fuses and relays (hist | edit) [10,739 bytes] Cliff (talk | contribs) (Created page with "'''Fuses and relays''' refers to the electrical protection and control devices used in the Pontiac Fiero. Fuses protect electrical circuits from excessive current. Relays allow a low-current control circuit to switch a higher-current load such as a fan, fuel pump, or other electrical device. == Overview == The Pontiac Fiero uses fuses, fusible links, circuit breakers, and relays throughout the electrical system. These parts are important for diagnosis because man...")

00:4700:47, 14 July 2026 1987 model-year changes (hist | edit) [4,249 bytes] CoolBlue87GT1 (talk | contribs) (The Metallic Blue color was a year only paint color for 1987)

15:4515:45, 12 July 2026 Transmission mounts (hist | edit) [10,135 bytes] Cliff (talk | contribs) (Created page with "'''Transmission mounts''' refers to the mounts and brackets that support the transmission or transaxle in the Pontiac Fiero. The transmission mounts help secure the drivetrain to the rear cradle. Worn, broken, loose, or incorrect mounts can cause drivetrain movement, clunking, vibration, shifting problems, exhaust stress, axle issues, and other symptoms. == Overview == The Pontiac Fiero uses a transverse drivetrain mounted behind the passenger compartment. The en...")
15:4315:43, 12 July 2026 Manual shifter (hist | edit) [8,483 bytes] Cliff (talk | contribs) (Created page with "'''Manual shifter''' refers to the interior gear selector used in manual-transmission Pontiac Fiero models. The manual shifter allows the driver to select gears by moving the shifter inside the passenger compartment. Because the Fiero transmission is mounted behind the passenger compartment, the shifter operates the transmission through shift cables rather than direct linkage. == Overview == Manual-transmission Fieros use a floor-mounted shifter located in the cen...")
15:4215:42, 12 July 2026 Transmission fluid (hist | edit) [16,773 bytes] Cliff (talk | contribs) (Created page with "'''Shift cable''' refers to the cable or cables that connect the interior shifter to the manual or automatic transmission in a Pontiac Fiero. Shift cables transfer driver input from the shifter to the transmission. Cable condition, adjustment, routing, and correct application are important for proper gear selection. == Overview == The Pontiac Fiero uses cables to operate the transmission shifter mechanism because the transmission is mounted behind the passenger co...")
15:4115:41, 12 July 2026 Shift cable (hist | edit) [10,363 bytes] Cliff (talk | contribs) (Created page with "'''Shift cable''' refers to the cable or cables that connect the interior shifter to the manual or automatic transmission in a Pontiac Fiero. Shift cables transfer driver input from the shifter to the transmission. Cable condition, adjustment, routing, and correct application are important for proper gear selection. == Overview == The Pontiac Fiero uses cables to operate the transmission shifter mechanism because the transmission is mounted behind the passenger co...")
15:4015:40, 12 July 2026 Grinding gears (hist | edit) [10,456 bytes] Cliff (talk | contribs) (Created page with "'''Grinding gears''' refers to a gear clash or grinding noise when shifting a manual-transmission Pontiac Fiero. Grinding during shifting does not automatically mean the transmission is ruined. In many Fieros, gear grinding is caused by incomplete clutch release, clutch hydraulic problems, shift cable issues, or driver technique rather than internal transmission failure. == Overview == Manual-transmission Fieros use a clutch, hydraulic clutch system, shifter, shif...")
15:3915:39, 12 July 2026 Clutch pedal (hist | edit) [11,338 bytes] Cliff (talk | contribs) (Created page with "'''Clutch pedal''' refers to the pedal used to operate the clutch hydraulic system in manual-transmission Pontiac Fiero models. The clutch pedal is an important part of the Fiero clutch system. If the pedal is bent, worn, incorrectly assembled, or does not move the clutch master cylinder far enough, the clutch may not fully disengage. == Overview == Manual-transmission Fieros use a hydraulic clutch system. When the driver presses the clutch pedal, the pedal moves...")
15:2515:25, 12 July 2026 Clutch bleeding (hist | edit) [18,696 bytes] Cliff (talk | contribs) (Created page with "'''Clutch bleeding''' refers to removing air from the clutch hydraulic system in manual-transmission Pontiac Fiero models. The Fiero uses a hydraulic clutch system. Air in the system can prevent the clutch from fully releasing, causing hard shifting, grinding, or difficulty selecting gears. == Overview == Manual-transmission Fieros use hydraulic pressure to operate the clutch. When the clutch pedal is pressed, the Clutch master cylinder pushes fluid through t...")
15:2215:22, 12 July 2026 Clutch slave cylinder (hist | edit) [16,499 bytes] Cliff (talk | contribs) (Created page with "'''Clutch slave cylinder''' refers to the hydraulic cylinder mounted at the transmission in manual-transmission Pontiac Fiero models. The clutch slave cylinder is part of the Clutch hydraulic system. It converts hydraulic pressure from the Clutch master cylinder into mechanical movement at the clutch release arm. == Overview == Manual-transmission Fieros use a hydraulic clutch system rather than a mechanical clutch cable. When the driver presses the clutc...")
15:2215:22, 12 July 2026 Clutch master cylinder (hist | edit) [14,040 bytes] Cliff (talk | contribs) (Created page with "'''Clutch master cylinder''' refers to the hydraulic cylinder operated by the clutch pedal in manual-transmission Pontiac Fiero models. The clutch master cylinder is part of the Clutch hydraulic system. It converts clutch pedal movement into hydraulic pressure, which is sent through the clutch hydraulic line to the Clutch slave cylinder at the transmission. == Overview == Manual-transmission Fieros use a hydraulic clutch system rather than a mechanical clu...")
15:2015:20, 12 July 2026 Clutch hydraulic system (hist | edit) [15,594 bytes] Cliff (talk | contribs) (Created page with "'''Clutch hydraulic system''' refers to the hydraulic clutch release system used in manual-transmission Pontiac Fiero models. The Fiero does not use a mechanical clutch cable. Instead, clutch pedal movement is transferred hydraulically from the clutch master cylinder to the clutch slave cylinder. == Overview == Manual-transmission Fieros use a hydraulic system to operate the clutch. When the driver presses the clutch pedal, the Clutch master cylinder pushes f...")
15:1915:19, 12 July 2026 Clutch (hist | edit) [10,603 bytes] Cliff (talk | contribs) (Created page with "'''Clutch''' refers to the manual-transmission clutch system used in manual-equipped Pontiac Fiero models. The clutch connects and disconnects engine power from the manual transaxle. In the Fiero, the clutch is operated by a hydraulic system using a clutch pedal, clutch master cylinder, hydraulic line, and clutch slave cylinder. == Overview == Manual-transmission Fieros use a single-disc clutch mounted between the engine and manual transaxle. When the clutch peda...")
15:0615:06, 12 July 2026 Manual transmission (hist | edit) [11,475 bytes] Cliff (talk | contribs) (Created page with "'''Manual transmission''' refers to the manual transaxle options used in the Pontiac Fiero. The Fiero was available with several factory manual transmissions during production, including four-speed and five-speed units. Manual-transmission Fieros use a clutch pedal, hydraulic clutch system, manual shifter, shift cables, and a transverse manual transaxle mounted behind the passenger compartment. == Overview == A manual transmission requires the driver to select gea...")
15:0515:05, 12 July 2026 Automatic transmission (hist | edit) [9,279 bytes] Cliff (talk | contribs) (Created page with "'''Automatic transmission''' refers to the automatic transaxle option used in the Pontiac Fiero. The Fiero used one factory automatic transmission during production: the TH125 automatic, also known as the TH125C or THM125C. It was a three-speed transverse automatic transaxle with a torque converter clutch. == Overview == An automatic transmission changes gears without the driver manually operating a clutch pedal or moving a manual gear selector through individ...")
15:0315:03, 12 July 2026 Transmission identification (hist | edit) [10,142 bytes] Cliff (talk | contribs) (Created page with "'''Transmission identification''' explains how to identify the transmission or transaxle installed in a Pontiac Fiero. The Fiero used several different manual and automatic transaxles from 1984 through 1988. Because many Fieros have been repaired, modified, or transmission-swapped, the installed transmission should be identified directly rather than relying only on the car's model year, engine, or trim level. == Overview == Transmission identification is important...")
15:0215:02, 12 July 2026 Transmission gear ratios (hist | edit) [6,210 bytes] Cliff (talk | contribs) (Created page with "'''Transmission gear ratios''' lists the commonly referenced factory transmission gear ratios used in the Pontiac Fiero. The Pontiac Fiero used several different manual and automatic transaxles from 1984 through 1988. Gear ratios varied by transmission type, RPO code, engine, and model year. Because many Fieros have been modified, repaired, or transmission-swapped, the actual installed transaxle should be identified directly when exact gearing matters. == Overview...")
14:1214:12, 12 July 2026 Fiero GT (hist | edit) [8,623 bytes] Cliff (talk | contribs) (Created page with "'''Fiero GT''' refers to the sport-oriented GT models of the Pontiac Fiero. The GT was the most recognizable performance and appearance version of the Fiero. It was introduced for the 1985 model year and continued through the end of production in 1988. == Overview == The Fiero GT combined the Fiero's mid-engine layout with sportier styling, upgraded equipment, and the 2.8L V6 engine. The GT name was used on two different body styles during Fiero production: * Th...")
13:0913:09, 12 July 2026 1988 suspension (hist | edit) [10,478 bytes] Cliff (talk | contribs) (Created page with "'''1988 suspension''' refers to the redesigned suspension system used on the 1988 Pontiac Fiero. The 1988 model year received the most significant suspension changes of any Fiero year. Although the basic mid-engine layout and space-frame construction remained the same, the 1988 suspension was substantially different from the 1984-1987 design. == Overview == The 1988 Fiero suspension was redesigned to improve handling, ride quality, steering feel, braking stability...")
13:0213:02, 12 July 2026 Getrag 5-speed (hist | edit) [14,736 bytes] Cliff (talk | contribs) (Created page with "'''Getrag 5-speed''' refers to the five-speed manual transmission used in later V6-equipped Pontiac Fiero models. The Getrag 5-speed was the factory five-speed manual transmission used with the 2.8L V6. It should not be confused with the Isuzu 5-speed, which was used with the 2.5L four-cylinder engine. == Overview == The Getrag 5-speed is a transverse manual transaxle used in later Fiero V6 applications. It replaced the earlier V6 four-speed manual transmissi...")
13:0013:00, 12 July 2026 Muncie 4-speed (hist | edit) [10,605 bytes] Cliff (talk | contribs) (Created page with "'''Muncie 4-speed''' refers to the four-speed manual transmission used in some Pontiac Fiero models. The Muncie 4-speed was used before the five-speed manual transmissions became common in later Fieros. It was available in different versions depending on model year, engine, and application. == Overview == The Muncie 4-speed is a transverse manual transaxle used in the Pontiac Fiero. It was used with both four-cylinder and V6 applications during Fiero production,...")
12:5812:58, 12 July 2026 Isuzu 5-speed (hist | edit) [13,047 bytes] Cliff (talk | contribs) (Created page with "'''Isuzu 5-speed''' refers to the five-speed manual transmission used in some Pontiac Fiero models. The Isuzu 5-speed was the factory five-speed manual transmission used with the 2.5L four-cylinder Fiero. It should not be confused with the Getrag 5-speed, which was used with the 2.8L V6. == Overview == The Isuzu 5-speed is a transverse manual transaxle used in four-cylinder Fieros. It was introduced during Fiero production as a more fuel-efficient alternative...")
00:2900:29, 12 July 2026 TH125 automatic (hist | edit) [19,715 bytes] Cliff (talk | contribs) (Created page with "'''TH125 automatic''' refers to the three-speed automatic transmission used in the Pontiac Fiero. The Fiero automatic transmission is commonly referred to as the '''TH125''', '''TH125C''', or '''3T40''', depending on naming convention and context. It was the factory automatic transmission available throughout Fiero production. == Overview == The TH125 automatic is a transverse three-speed automatic transmission used with both the 2.5L four-cylinder and 2.8L V6 Fie...")

21:3921:39, 11 July 2026 1984 Fiero Indy Pace Car (hist | edit) [6,034 bytes] Cliff (talk | contribs) (Created page with "'''1984 Fiero Indy Pace Car''' refers to the special 1984 Pontiac Fiero associated with the 1984 Indianapolis 500. The Pontiac Fiero was selected as the pace car for the 1984 Indianapolis 500. Pontiac also produced a limited-production Indy Pace Car replica for the public. The production replicas shared the Indy-themed appearance package but used the standard 2.5L Iron Duke four-cylinder engine rather than the specially prepared engine used in the actual pace ca...")
20:3720:37, 11 July 2026 2.8L V6 (hist | edit) [10,183 bytes] Cliff (talk | contribs) (Created page with "'''2.8L V6''' refers to the factory V6 engine used in the Pontiac Fiero from 1985 through 1988. The Fiero 2.8L V6 was part of GM's 60-degree V6 engine family. It was not a Fiero-only engine, but the Fiero version was adapted for the car's transverse mid-engine layout and used multi-port fuel injection. == Overview == The 2.8L V6 was introduced in the Fiero for the 1985 model year. It gave the Fiero a factory performance engine option and was used in sportier model...")

18:0818:08, 7 July 2026 Iron Duke (hist | edit) [3,516 bytes] Todd82TA (talk | contribs) (Created page with "The Iron Duke ... (insert history) '''Year-to-Year Changes in the Pontiac Fiero:''' '''1984:''' - Crossflow design '''1985:''' - Roller Cam (mid-year Update) '''1986:''' - V5 A/C Compressor Upgrade '''1987:''' - Elimination of ThermAC - Newer ECM (model) and Intake Air Temperature sensor - New Rochester TBI Unit - DIS Ignition '''1988:''' - Balance Shaft - Integrated Oil Filter") originally created as "Duke engine"

21:2221:22, 6 July 2026 1986.5 Fiero GT (hist | edit) [3,403 bytes] Cliff (talk | contribs) (Created page with "'''1986.5 Fiero GT''' is an enthusiast term commonly used for the fastback version of the 1986 Pontiac Fiero GT. The term “1986.5” is not an official Pontiac model year. It is commonly used by Fiero owners to distinguish the later 1986 fastback GT from the earlier 1986 notchback GT. == Overview == During the 1986 model year, the Fiero GT changed from the earlier notchback body style to the fastback body style. Because this change happened during the model yea...")
21:2121:21, 6 July 2026 Model years (hist | edit) [2,677 bytes] Cliff (talk | contribs) (Created page with "'''Model years''' provides an overview of the Pontiac Fiero by production year. The Pontiac Fiero was produced for five model years, from 1984 through 1988. Each year had changes in available models, engines, equipment, styling, suspension, brakes, electrical systems, and options. == Overview == Although all Fieros share the same basic mid-engine layout and space-frame construction, there are important differences between model years. Some changes were cosmetic,...")
20:4520:45, 6 July 2026 Fuel pressure test (hist | edit) [6,475 bytes] Cliff (talk | contribs) (Created page with "'''Fuel pressure test''' refers to checking fuel-system pressure on the Pontiac Fiero. A fuel pressure test is useful when diagnosing no-start conditions, hesitation, poor acceleration, lean or rich running, stalling, hard starting, and fuel-related diagnostic trouble codes. == Overview == The Fiero fuel system must provide the correct pressure and volume for the engine to run properly. Low fuel pressure can cause lean running, hesitation, stalling, poor accelera...")
20:4420:44, 6 July 2026 Radiator (hist | edit) [5,996 bytes] Cliff (talk | contribs) (Created page with "'''Radiator''' refers to the front-mounted heat exchanger used by the Pontiac Fiero Cooling system. The radiator removes heat from the engine coolant. Because the Fiero has a rear-mounted engine and a front-mounted radiator, the radiator is connected to the engine by long Coolant pipes running underneath the car. == Overview == The Fiero radiator is mounted at the front of the vehicle, while the engine is mounted behind the passenger compartment. Coolant...")
20:4320:43, 6 July 2026 Water pump (hist | edit) [4,842 bytes] Cliff (talk | contribs) (Created page with "'''Water pump''' refers to the coolant pump used by the Pontiac Fiero Cooling system. The water pump circulates coolant through the engine, coolant pipes, and radiator. It is essential for removing heat from the engine and maintaining normal operating temperature. == Overview == The Fiero uses a rear-mounted engine and a front-mounted radiator. Because of this layout, the water pump must move coolant through long coolant pipes running between the engine compar...")
20:4220:42, 6 July 2026 Thermostat (hist | edit) [5,274 bytes] Cliff (talk | contribs) (Created page with "'''Thermostat''' refers to the coolant thermostat used in the Pontiac Fiero Cooling system. The thermostat helps control engine warm-up and operating temperature by regulating coolant flow through the cooling system. == Overview == The Fiero thermostat is part of the engine cooling system. It remains closed or mostly closed when the engine is cold, helping the engine warm up more quickly. As coolant temperature rises, the thermostat opens and allows coolant to...")
20:4220:42, 6 July 2026 Coolant pipes (hist | edit) [4,761 bytes] Cliff (talk | contribs) (Created page with "'''Coolant pipes''' refers to the long coolant tubes used by the Pontiac Fiero cooling system. Because the Fiero engine is mounted behind the passenger compartment and the radiator is mounted at the front of the car, coolant must travel through long pipes running along the underside of the vehicle. == Overview == The Fiero cooling system is different from many front-engine cars because the engine and radiator are far apart. Coolant travels from the engine to the...")
20:4120:41, 6 July 2026 Radiator fan relay (hist | edit) [12,429 bytes] Cliff (talk | contribs) (Created page with "'''Radiator fan relay''' refers to the electrical relay used to switch power to the Pontiac Fiero Radiator fan. The radiator fan relay allows a low-current control circuit to turn on the higher-current radiator fan motor. == Overview == The radiator fan motor requires more current than a simple temperature switch or control circuit should carry directly. The radiator fan relay acts as an electrical switch. When the control side of the relay is activated, the...")
20:4020:40, 6 July 2026 Radiator fan switch (hist | edit) [10,568 bytes] Cliff (talk | contribs) (Created page with "'''Radiator fan switch''' refers to the temperature switch used to turn on the Pontiac Fiero Radiator fan on models that use a fan switch. The radiator fan switch is part of the cooling-system control circuit. It should not be confused with the Coolant temperature sensor used by the ECM or the Coolant temperature sender used by the dashboard Temperature gauge. == Overview == The Fiero uses several temperature-related parts, and they are often c...")
20:3920:39, 6 July 2026 Radiator fan (hist | edit) [11,017 bytes] Cliff (talk | contribs) (Created page with "'''Radiator fan''' refers to the electric cooling fan used at the front radiator of the Pontiac Fiero. The radiator fan helps pull air through the radiator when vehicle speed or natural airflow is not enough to keep coolant temperature under control. == Overview == The Fiero radiator is mounted at the front of the car, while the engine is mounted behind the passenger compartment. Because of this layout, the cooling system uses long coolant pipes between the engin...")
20:3920:39, 6 July 2026 Coolant temperature sender (hist | edit) [4,358 bytes] Cliff (talk | contribs) (Created page with "'''Coolant temperature sender''' refers to the engine-mounted sender used for the Pontiac Fiero dashboard Temperature gauge and temperature warning-light circuit. The coolant temperature sender should not be confused with the Coolant temperature sensor used by the ECM. == Overview == The Fiero uses separate temperature-related parts for different purposes. The coolant temperature sender provides information to the instrument cluster. The ECM coolant...")
20:3820:38, 6 July 2026 Temperature gauge (hist | edit) [4,917 bytes] Cliff (talk | contribs) (Created page with "'''Temperature gauge''' refers to the dashboard engine-temperature gauge used in the Pontiac Fiero Instrument cluster. The temperature gauge displays engine coolant temperature to the driver. It should not be confused with the Coolant temperature sensor used by the ECM. == Overview == The Fiero uses separate temperature-related parts for different purposes. The dashboard temperature gauge receives its signal from the temperature gauge sender. The ECM...")
20:3820:38, 6 July 2026 Instrument cluster (hist | edit) [4,684 bytes] Cliff (talk | contribs) (Created page with "'''Instrument cluster''' refers to the dashboard gauge and warning-light assembly used in the Pontiac Fiero. The instrument cluster displays important vehicle information such as speed, fuel level, engine temperature, warning lights, and other driver information depending on model year and equipment. == Overview == The Fiero instrument cluster is part of the interior and electrical system. It provides visual information to the driver and receives signals from sev...")
20:3720:37, 6 July 2026 Speedometer (hist | edit) [4,612 bytes] Cliff (talk | contribs) (Created page with "'''Speedometer''' refers to the vehicle-speed display system used in the Pontiac Fiero instrument cluster. The speedometer displays vehicle speed to the driver and is closely related to the Vehicle speed sensor circuit. Vehicle speed information is also used by the ECM for certain engine-management and diagnostic functions. == Overview == The Fiero speedometer system receives a signal from the Vehicle speed sensor, often abbreviated as VSS. The VSS is...")
20:3620:36, 6 July 2026 Idle problems (hist | edit) [6,819 bytes] Cliff (talk | contribs) (Created page with "'''Idle problems''' refers to high idle, low idle, rough idle, surging idle, stalling at idle, or unstable idle behavior on the Pontiac Fiero. Idle problems can be caused by many different systems. Common causes include Vacuum leaks, throttle-body problems, Idle air control valve problems, Throttle position sensor faults, EGR leaks, ignition problems, fuel problems, sensor faults, wiring problems, or poor grounds. == Overview == The ECM controls id...")
20:3520:35, 6 July 2026 Throttle body (hist | edit) [4,621 bytes] Cliff (talk | contribs) (Created page with "'''Throttle body''' refers to the air-control assembly used by the Pontiac Fiero engine. The throttle body controls the amount of air entering the engine. It also carries or works with several important engine-management parts, including the Throttle position sensor and Idle air control valve. == Overview == The throttle body is part of the intake system. When the accelerator pedal is pressed, the throttle linkage opens the throttle plate. This allows mor...")

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