In message , The Natural
Philosopher writes
Airflow meters are often nothing more than a flap that turns a
potentiometer and a light spring to close against air pressure.
The Zetec S engine uses a hot wire MAF, no flap, no potentiometer. Do
not prod about in it, you could irreparably damage it.
If its sticking then full RPM may well not get you full fuel - leading
to weak running at high RPM.
Not valid, see above.
The garage may have adjusted the mixture weak anyway to get CO
emissions down.
Not adjustable without using brute force to crush the fuel pressure
regulator so unless they are a real bunch of thugs who enjoy stretching
fuel pressure regulators it's not been 'adjusted'.

See if you can ID te fuel flow meter - generally in the inlet pipework.
A leak in that pipework that by-passes teh meter may alos have bad
results.
What fuel flow meter?
Replacements from scrappies should work.
Providing they've not been rained on with the loom unplugged.






Chris

--
Clint Sharp