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MG MGF Technical - Idle Speed shake ??

after just start in morning, My idle speed "sometime" is under 850 and shaking .
Or after I driver very long , I shifted gears and stepped on clutch. My idle speed was under 850 and shaking .
I cleaned stepper motor and modified alloy throttle.
I modified alloy throttle becasue My idle speed was high(1300-1500) after driving very long .
after I connect to diagnosis computer, My alloy throttle was normal .
after I checked very place near engine, they were normal .
Why??
WHY??

KUO yuan-hsin

Who Can tell me the Question ?
KUO yuan-hsin

Turn on ignition but don't start engine.
Push throttle to the floor five times within 7 seconds or so.
Turn off ignition.
Throttle calibration should be reset.
HTH
Bruce Caldwell

Thank you. I has tried it ,But be no efficacy.
Why ?
KUO yuan-hsin

Help me !!!!!!
I use the ways with the homepage .
http://www.mgf.ultimatemg.com/group2/Throttle_body/index.htm
But the all ways are no efficacy.
My car has connected to diagnosis computer ,And No any troubles.
My throttle has changed to alloy throttle body .
I has no any ways to the 1200-1300rpm range.
The 1200-1300rpm range problem sometimes occur.


Why ??
KUO yuan-hsin

Check the gaps of the ignition plugs and set to minimum gap. Check comoression of each cylinder. It is possibly a misfire in one cylinder.
Bruce Caldwell

"Check comoression of each cylinder. It is possibly a misfire in one cylinder"
If My car have the state , My car will very shake and no smooth .

The gaps of the ignition plugs is new , and ignition also new.

My engine had repaired lately.
KUO yuan-hsin

This thread was discussed between 09/01/2008 and 26/01/2008

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