How To Test A 75TS AFM?

["Mair, Dougal" <D.I.Mair@xxxxxxxxxxxx>]

Hi All,

I am still trying to track down a sluggish acceleration problem on my 75
twinspark. Can anyone tell me how I can test the air flow meter? I have
tried a multimeter on the unit to measure the resistance and manually moved
the airflow flap. It appeared to have a linear resistance increase up to a
certain point, but then the resistance went funny for a bit and then
decreased in resistance as the flap was moved further. Does anyone have an
idea of what the resistance range should be like?

Also, a stab in the dark. The engine is running very cool (approx 60 degrees
Celsius when fully warmed up) according to the temperature gauge and I think
either the temperature sensor or the thermostat is faulty. Could the engine
running cooler or the temperature sensor upset the engine management system
and possibly cause this sluggish problem?

The odd time that the engine doesn't accelerate sluggishly, the old girl
(152k) gives you a decent kick in the pants, so I know it has it in her. Any
help with this problem would be greatly appreciated.

Cheers,
Dougal.


Dougal Mair
Palmerston North
New Zealand
89 AR75 2.0TS Red (of course)
84 AR33 1.5(single carb) Grey

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