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MG MGF Technical - Stalling problems.

Hi! All

I have owned my 2001 MGf since Feb.2005 and
my car suffered it's second HGF at 67,000 miles.
My mechanic thinks it had its first just prior
to my buying the car at 36,000 miles and that it
was a bodge job just to get the car into a saleable
condition, but anyway, I like, no love this car.

I have now done 85,000 miles and very recently I had
to have the plastic inlet manifold replaced as a
fault light suddently lit up on instrument clustre.
Got a stainless steel one from Brown & Gammons which
my mechanic fitted, but it also needed a new
throttle body and throttle potentiometer (to link up
with the ems - whatever that is). Anyway the
computerised diagnosis said everything was now fine
and away I drove.

Happy as a sand boy, everything seemed fine engine wise, but then the engine would cut out when you
came to a junction, or if you were in a traffic
jam, you would have to start the car every time you
moved as it had cut out. On another day, nothing,
you would come to halt and the rev.counter would
idle at 800-1000 revs. all day long. I'd think
the problem had cured itself, then a couple of
days later, the engine would cut out again when
you came to a halt.

Any ideas anyone as I and my mechanic are a bit
baffled at the moment as to what it is or how to
cure it - cheaply pleasd!

Regards - Bill
W.A. Pearson

Faulty earth for the car's ECU, MEMS? Problem with the relay pack? Sticking IACV?
Rob Bell

Certainly sounds electrical and there's a possible cheap fix - undo every last sensor connection you can find, sluice it with electrical contact spray, and reconnect. Connectors that have sat quite happily for 85,000 miles can often prove troublesome when dismantled/remantled, and feeble and/or intermittent contact is the most common symptom in my experience. If any look particularly corroded, clean up the contact surfaces with sandpaper & then spray.
bandit

Hi! Rob & Bandit

Thanks for your imput. I've decided to run the car
for a few more days to see if I can add any pointers
as to where the cause may lie. I have trawled through
the Archive for any other clues as well.

Each day the car drives ok, either from cold or warm
and then suddenly the revs. will drop to zero. Read
one tip that was to depress the accelarater pedal 5
times with the ignition on (engine off) which will
reset the ECU and this worked for a while before
the problem came back. Also found that under
severe accelaration, the engine stuttered for a bit
before the engine fired smoothly on all cylinders.
Also the radiator fan came on, even after short
journeys. I check oil and water fanatically (since
I had two previous HGF's) and they were ok.
On the previous service all electrical leads and
spark plugs were changed as my mechanic found the
previous cause of the stuttering was one of the
spark plugs "arking" round the outside of the plug.

Questions I am asking myself, before I ask my tame
MG mechanic is: could the water temp sensor be giving a false reading, would the crank position sensor been
dislodged when he replaced the inlet manifold (unlikely!). Could it be an earthing problem with the
pink black (sensor earth), then all other sensors
could be affected.

Your thoughts please.

Thanks

Bill
W.A. Pearson

This thread was discussed between 08/07/2008 and 11/07/2008

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