Rover SD1 Efi Archive - (Flapper) Air Flow Meter

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With the exception of the ECU, the flapper Air Flow Meter (AFM) is the most complex and expensive original component of the Rover SD1 Efi system.

Despite a delicate mechanism they rarely fail yet do have a reputation for unreliability most likely due to abuse because a prior owner or inexperienced technician has messed with the internal workings often evidenced by observing the plastic cover has been removed and untidily replaced.

Fortunately there are still plenty of inexpensive used items available through the second hand spares market or popular auction sites.

Alternatively, given access to the correct diagnostic equipment and a degree of common sense it is possible to reset the internal components to restore normal functionality. It is also possible to adjust it empirically if one is willing to test performance between adjustments.

One might conclude that the AFM being an important, intricate and expensive (as new) part of the system, there is an argument for not messing with its internals but seeking out expert help.

Then again, experts can be rare, pricey and self-styled so why not obtain a low-cost spare S/H unit as back-up, an inexpensive CO analyser, study this article in depth and give it a go? You Decide!

The contents of this article are listed above. Read the full two page html version from here:

As a technical guide to Carbon Monoxide (CO) content, detection and analysis, accompanying this article is the “Gunson Gastester” Mk2 Handbook for further reading and research here (423kb)

Please advise of errors and omissions.................................................Return to Efi Components Index

Rover SD1 Efi Air Flow Meter

Rover SD1 AFM - Article Contents



Testing the Functions

Initial Set-up and Testing CO Content

The Diagnostic Challenge Continues

This above article is one of fifteen or so presentations on the key components making up the Electronic Fuel Injection System fitted to Rover SD1 Vitesse and Vdp Efi.

Pulling all these components together is the Efi Operations, Test and Instruction Manual enabling Home Enthusiasts to better understand its Purpose, Function and Maintenance.


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