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MG MGF Technical - Engine surging

Hi

Can anyone help? Just got my 98VVC back from having HG fixed and now the engine starts surging up and down between 1000RPM and 3000RPM when idle, also changed radiator, water pump and cambelt whilst HG was being fixed.

cheers in adavance...


Chris.
Chris

IACV?
Bob Millar

Chris,
Take a look in the mgf Technical archives, search on Stepper or "reset", you will find similar queries and answers.
Mike
Mike (@home)

Me again.

Seriously try the following. Both myself and a couple of others had this fault and only yesterday did I get rid of it.

I had tried all the obvious things like a sticky throttle body and the pot on the stepper motor.In the end it was a poor contact on one of the multi pin plugs on the mems. Try disconnecting the plugs and if you have some contact cleaner give them a spray. Worked for me and hopefully will for you as it is rather annoying and I am sure it was drinking more petrol than normal.
S Laithwaite

And again !

By the way I noticed that if you disconnect the plug for the pot the engine will automatically raise its idle to about 2000 rpm. Therefore in my case I assume that the signal from the pot on the throttle body was poor.
S Laithwaite

Hi Chris,
I had the same problem after my HG blew on my new (second hand) F. It turned out that the coolent getting into the engine at the time of the failure cased a shour in a number of the engine managent components. It was costly to rectify however I was lucky as the car was still under warranty as I had only driven it for 20 miles.

Hope this helps

Mogs
Mogs

This thread was discussed between 22/03/2004 and 23/03/2004

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