IACV Operation

Hello all,



I recently purchased a '98 MGF VVC and have two problems which I am struggling with and I am really hoping someone here will be able to help me solve them.



The most inconvenient is the engine stalling when reverting to idle when under load.



With lights and heater fan on, or steering on full lock, (to put a load on the engine) and I blip the throttle from idle (approx 900rpm) to less than 1500 rpm then the idle speed drops to around 400rpm or stalls completely. If I blip the throttle to above 1500 rpm it seems to behave: when dropping back, the engine speed hesitates at 1500 before returning to normal 900rpm idle speed.

This only happens after the engine has reached normal operating temperature and only when there is a load on the engine.

Having looked on this forum and read through the Rover workshop manual I suspect the Idle Air Control Valve or the throttle body may be to blame. I removed the IAC valve from the inlet manifold and took a video of it's operation as the ignition is switched ON and OFF. It seems a bit juddery and a bit noisy:



http://ift.tt/1y64ciW



Does anyone know if this is normal operation or could this be the problem?



Thanks, Steve.

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