Category: Engine

As you can probably guess from my last post, I am pretty frustrated that there is not a way to properly test the manifold pressure sensor. I want to be able to tell in the future if the one that’s working now has changed its operating characteristics, so I came up with a method to test.

Continue reading “Testing and Adjusting Manifold Pressure Sensor”

I hope you are all staying healthy, and if possible, taking advantage of some self isolation in the garage.

The Jaguar runs excellent again!!!!! Since the move to Denver, the engine has not run right. After trying a number of things and much frustration, replacing the MPS fixed the problem……here is the whole story.

Continue reading “Manifold Pressure Sensor”

In 1973, the carburetor V12 was first introduced in the XJ sedan and Car and Driver observed 9 to 11.5 mpg.  The first model with fuel injection was the ’75 XJ12C and AutoTest found a 21% improvement in fuel economy (some was due to higher gearing).

Continue reading “Just how Thirsty is the V12?”

The mantra for Jaguar V12 owners is to avoid the engine running lean or overheating.  Here is the journey I have been on to continue improving the cars cooling capability. Continue reading “Cooling System Upgrades”

While checking the timing as I was troubleshooting the backfiring problem, I wondered if the timing mark plate may have moved.  I decided to check if top dead center was really lined up with the 0° advance timing mark.   Continue reading “Top Dead Center”