1984 Jaguar XJ Specs
1 powertrain configuration on federal record for the 1984 Jaguar XJ: 4.2L 6-cyl Regular Gasoline, rated up to 15 MPG combined by the EPA.
Source: EPA federal records (fueleconomy.gov) · Updated 2026-10-26 · By CarWhere Research
| Engine | Transmission | Drivetrain | City | Highway | Combined |
|---|---|---|---|---|---|
| 4.2L 6-cyl Regular Gasoline | Automatic 3-spd | — | 14 | 17 | 15 |
XJ by year
Buying a used XJ? Specs are the easy half.
Check which XJ years to avoid (federal complaint and recall records), then check the specific car: the Full VIN Report shows that VIN's factory build, recall record, and market history before you pay for it.
Frequently asked questions
What engines does the 1984 Jaguar XJ have?
One powertrain on federal record: 4.2L 6-cyl Regular Gasoline, offered with Automatic 3-spd. The full per-configuration table is above.
What gas mileage does the 1984 Jaguar XJ get?
EPA combined ratings run 15–15 MPG depending on configuration — the table above shows city/highway/combined for each engine, transmission, and drivetrain.
Is 1984 a good year for the Jaguar XJ?
Specs don't answer that — the federal complaint and recall record does. See the Jaguar XJ year-by-year reliability verdicts at carwhere.com/research/years-to-avoid/jaguar/xj, built from NHTSA data.
How do I get the specs for my exact VIN?
These are the federal-record configurations for the 1984 Jaguar XJ overall. For one specific vehicle — its exact engine, trim, factory options, and original window sticker — decode the 17-character VIN free at carwhere.com/tools/vin-decoder.
Where does this data come from?
The U.S. EPA's public vehicle dataset (fueleconomy.gov) — the federal record of every US-market configuration since 1984 — refreshed 2026-10-26. Public-domain data; republish with attribution to CarWhere (carwhere.com).