Hot Start Problem caused by Fuel Vaporization on Efi SD1

[ramon alban]

Since 1996 I have been intrigued by this subject and in 2006, Campbell Macrae found a 1986 Technical Newsletter that Rover sent to its Australian Dealers which threw new light on the subject. The following extract defined Rover’s problem:

“Fuel vaporization can occur at the injectors when a vehicle with the engine at warm to hot operating temperature is parked in the sun for a short period and then restarted. Should a customer complaint of this nature be experienced, the following action ------- etc, etc.”

Whatever solution Rover devised, it had to work seamlessly from the ignition key in order to satisfy indignant owners suffering this hot start problem every time the sun shone on their executive car just a few years after they purchased it. Not good PR methinks?

Although the original circuit diagrams are still missing I have pulled all the other loose ends of the story together to explain the physics of what happened and how Rover’s solution worked. I hope the science bears scrutiny regarding this somewhat mythical problem.

You can read or download the story and the newsletter via the following link:

http://uk.blog.360.yahoo.com/maureen9235

If anyone cannot access the documents please let me know.

Ramon
http://uk.blog.360.yahoo.com/maureen9235
http://perso.orange.fr/ineedaholiday/SD1.html