Over fuelling ??

[gorrington1]

Hi all,had a problem with my S2 overheating. Turns out it was a stuck thermostat,also the otter switch seems to be broken.I have bypassed the switch until a new one arrives.Now she seems to be over fuelling sometimes. The choke keeps chucking in extra fuel. The tickover varies between 1000 and 2000 rpm. Also,after taking your foot off the accelerator she seems to "cough", she isnt misfiring and pulls well.It makes no difference if she is hot or cold.
Any ideas what might be causing this problem ? She was parked up for a few months prior to the problem.
Thanks.

[johnnywgk]

Mine had an over fueling problem that a new fuel regulator
sorted out, but I wouldn't know how to test one.

The rolling road guys at Austec sorted it.

[Maffe]

Is it the 2.8 or 2.9 engine in your car?

[Maffe]

If its the 2.8 I would start with checking the airflow meters, located next to the airfilter. See if the black plastick thingy looks ok ( the metal thread in it) look at the valves/choke ( sorry can't find the word for it) so they move as they should. If one of them don't move like it should the icu gets wrong value and go nuts! My old xr4x4 2.8 drank 6 liter @10km when this happend, also engine almost stalled when let go of the throttle. Also idle between 900-2000rpm
Next take a look at the "idle engine valve" same there dismount and look so it behaves as it should.

Hope this help!

[gorrington1]

Hi again,it's the 2.9

[jacksocket]

I had over-fuelling problems a few weeks ago. At the time I wasn’t sure what the issue was and thought it oil related, due to the black residue dripping out of the header pipes. It turned out the high petrol content being pumped through the exhaust was effectively washing out the pipes.
The fault was located with engine diagnostic equipment and turned out to be the eng.temp sensor being out of spec. The replacement sensor was £20 if I recall, and the engine returned to fuelling correctly after fitting, although still a little smokey when cold.
So it may be wise to check with a volt meter what the ECU is seeing and whether its in the correct range.
Ranges are 20°C-3.1V, 40°C-2.2V, 100°C-0.5V ( from the ECC pin out info sheet on this useful page http://www.auto-diagnostics.info/ford_eec_iv).
Hope this helps.
steveS

[Maffe]

Check all the vacuum hoses, crank house went and idle engine valve. Look at the throttle pot and valve, maybe measure the throttle pot? I´m sure what resistance it should be 500 ohm?