ENGINE IDENTIFICATION
Engine is identified by eighth character of Vehicle Identification Number (VIN). See ENGINE IDENTIFICATION CODES table. VIN is located on top of instrument panel, near lower left corner of windshield. VIN is also stamped on Vehicle Certification (VC) label mounted on left door pillar.
An engine code label is located in engine compartment, in front of radiator and on right valve cover. Label contains engine calibration number, engine build date, engine plant code and engine code.
Emission calibration number label is located on upper radiator shield. This label identifies engine calibration number, engine code number and revision level. Numbers from labels are required when ordering replacement parts.
| Engine Type | Fuel System | Engine Plant | VIN Code |
|---|---|---|---|
| 4.6L SOHC | SFI | Romeo | W |
| 4.6L SOHC | SFI | Windsor | 6 |
ENGINE IDENTIFICATION CODES
Windsor and Romeo engine plants are producing a 4.6L engine for some vehicles. There are several differences between these engines and many parts are not interchangeable.
The best way to determine manufacturer is by the VIN number. VIN W is Romeo engine. VIN 6 is Windsor engine. There are a couple external differences. The right valve cover on Windsor engine has 14 bolts, Romeo engine has 11 bolts. Also on Windsor engine there is a W stamped on each valve cover in area of camshaft sprocket.