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Running on 3 and low idle speed when cold - 200 1981

posted by  someone claiming to be Rhys on  Sun May 8 08:01 CST 2005 [RELATED]

If it is running on three cylinders it will have a rythmic miss. If the misfire is random, then it is running roughly, and that is a different diagnostic approach.
So if the miss is rythmic, remove the spark plugs leads one at a time and replace with the engine running. The one that makes no difference is then the affected cylinder. You have to identify the specific cylinder.
You can move items, one step at a time, from that cylinder to another to identify the cause. So change the spark plug with another cylinder and see if the miss moves too. Change an igntion wire (they have been know to be faulty brand new), and then an injector. Do a compression test on that cylinder. If bad, check the valve clearances on that cylinder.
If the ignition and compression check out fine, then check for a pulled intake manifold gasket - spray propane or acetylene around the runner at the head and see if the cylinder picks up.
Until the misfire is cured, there is no worrying about the cold low idle.





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