245 Air Mass Meter

Usually they either work or they don't. They tend to fail intermittently at first, then die completely and the car won't start until you unplug it, or starts and dies.

A good place to start is the old-fashioned look at the spark plug insulators surrounding the center electrode. They should be a bone color or slightly tan. If the engine is usually running rich they will be darker, with medium grey to black being an indication that it's a problem.

It is rare for an AMM to drift out of adjustment; more common failures cause the engine to run badly, especially at idle.

Mike

I acquired an '85 245 which smoked dark smoke, most especially at idle; WAY too rich.

I replaced the AMM: problem solved.

Hi Jeff,

If you suspect the AMM, pull the plug. Clean the pins and the sockets with Contact Cleaner, push the plug in and pull it out ten times and then coat both with Dielectric Grease. (Replace the plug...........................:-)

I can't help re *testing* the AMM, but the above procedure got me going when my '93 245 Classic wouldn't even start.

Good Luck. Andy I.

OK thanks for the info - I am in the UK and I have not noticed "Bentleys" in the Shops - our mainstream book publisher is "Haines" and from the reputation they are not a patch on Bentleys.

Thanks again Nick