What year did Jaguar start using Ford engines?

What year did Jaguar start using Ford engines?

The only Ford based engine Jaguar used was the AJ-V6 used in the X-Type and some S-Type models. It was in production from 1999 through 2011.

The bottom end was your basic Ford Duratec V6 found in countless Ford Tauruses, topped off with a Jaguar derived cylinder head that added variable valve timing to the basic Duratec architecture.

Contrary to popular belief, Jaguar's 4.0, 4.2 and 5.0 V8s are not Ford engines. The AJV8 engine family was developed while Ford owned the company, but it was developed in England by Jaguar engineers, not by anyone brought in by Ford.

That being said, Ford developed the S-Type and the Lincoln LS concurrently on the same basic platform, and Ford just couldn't help raiding Jaguar's parts bin for that V8, putting a slightly less powerful version into the LS, and later, the Thunderbird. Again, without the variable valve timing.

Even so, the V8, introduced in 1997 in the XK8 coupe, was a true Jaguar engine, and not a Ford motor.