Quote:
Originally Posted by john charlton
On idle my P/U will not fire on no.4 cylinder .I checked the compressions on the engine cold . 1,2,3 are all spot on 60lbs . No 4 is 65 lbs which I guess could be that caused by unburnt residue in the cylinder/rings etc . I have changed the plugs around,changed the manifold gasket,checked all points gaps are correct and even .Changed the distributer cap . When I short out no 4 with a screwdriver I have a hefty spark the same as the others . I thought maybe an airleak in the manifold but no 3 shares that, it fires fine . On idle I have enriched the GAV but no change . What am I missing ??? I need a logical explanation !!! When at highway speed it runs on 4 and pulls fine maybe I worry too much !!! Keep on driving what the heck but still it bugs me .
John in cloudy mild rain on the way AGAIN Suffolk County England .
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Have you thought about that it may be also misfiring on #4 at highway speed, you just don't notice it because it's being masked by the other 3 cylinders?