Cliff: 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..."

2026-07-22T12:23:53Z

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..."

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'''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:

* [[Iron Duke|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 parts identification label]] along with transmission, paint, trim, wheel, audio, and other factory build codes.

The RPO code identifies original factory equipment. It does not necessarily prove what engine is currently installed, because many Fieros have been repaired, modified, or engine-swapped.

== Engine codes ==

{| class="wikitable sortable"
! Code
! Engine
! Common Fiero name
! Notes
|-
| LR8
| 2.5L four-cylinder
| [[Iron Duke]]
| Factory four-cylinder Fiero engine
|-
| L44
| 2.8L V6
| [[2.8L V6]]
| Factory V6 Fiero engine
|}

== LR8 ==

'''LR8''' identifies the 2.5L four-cylinder engine used in the Fiero.

In Fiero owner usage, this engine is commonly called the [[Iron Duke]]. It may also be referred to as the 2.5L four-cylinder, 2.5L L4, Tech 4, or Duke engine.

Related topics:

* [[Iron Duke]]
* [[2.5L four-cylinder]]
* [[Tech 4]]

== L44 ==

'''L44''' identifies the 2.8L V6 engine used in the Fiero.

The L44 was the factory V6 engine used in V6-equipped Fieros, including GT, SE, and Formula applications depending on model year and trim.

Related topics:

* [[2.8L V6]]
* [[Fiero GT]]
* [[1988 Pontiac Fiero]]
* [[1988 Fiero Formula]]

== Relationship to VIN engine codes ==

Engine RPO codes should not be confused with VIN engine codes.

The RPO code appears on the [[Service parts identification label]] and identifies factory equipment assigned to the car.

The VIN engine code is part of the vehicle identification number and also identifies the engine originally assigned to the vehicle.

For Fiero engine identification, both the RPO label and VIN can be useful, but the actual installed engine should still be inspected on modified or repaired cars.

Related topic:

* [[VIN]]

== Relationship to transmission codes ==

Engine and transmission codes are often used together when identifying how a Fiero was originally built.

For example, the original engine RPO can be compared with transmission RPO codes such as:

* [[TH125 automatic|MD9]]
* [[Muncie 4-speed|MY8]]
* [[Muncie 4-speed|M17]]
* [[Muncie 4-speed|M19]]
* [[Isuzu 5-speed|MT2]]
* [[Getrag 5-speed|MG2]]

A car's current engine and transmission may not match the original RPO label if it has been swapped or repaired.

Related topics:

* [[Transmission RPO codes]]
* [[Transmission identification]]
* [[Engine swaps]]

== Using engine RPO codes ==

Engine RPO codes can be useful for:

* Verifying original engine equipment
* Ordering parts
* Documenting a restoration
* Comparing the car's current engine with its original configuration
* Researching model-year differences
* Checking whether a car was originally four-cylinder or V6-equipped

== Modified and swapped cars ==

Many Fieros have had engine swaps, replacement engines, rebuilt engines, or drivetrain changes.

The engine RPO code identifies how the car was originally built. It does not prove that the original engine is still installed.

When ordering parts or documenting a modified car, use the RPO code together with physical inspection of the engine, VIN information, casting numbers, emissions label information, and other identifying details.

== Notes ==

Engine-code information should be verified carefully, especially on cars that have been modified, repaired, repainted, or restored.

The [[Service parts identification label]] is a factory build reference, not a complete history of the car.

== See also ==

* [[RPO codes]]
* [[Fiero RPO code list]]
* [[Service parts identification label]]
* [[Iron Duke]]
* [[2.8L V6]]
* [[Transmission RPO codes]]
* [[Engine swaps]]
* [[Factory specifications]]
* [[Technical specifications]]

[[Category:Fieropedia]]
[[Category:Reference]]
[[Category:RPO codes]]
[[Category:Engine]]

Engine RPO codes - Revision history