Question1966 ford galaxie 59.000 miles given to me by by grandmother she bought it new.
I've driven it for over 10 yrs.to car shows only in summer.winter I start it monthly let it run 30 min or more.This summer started it and had a miss.so far I've replaced plugs.points,cap rotor.coil,ck compression all cylinders between 130-170 spark jumps to all plugs when holding wires but, out of 8 cylinders 4 are dead. What I'm saying on very other cylinder in fireing order it's dead by pulling the wire from plug dose not change engine running. timming is at 6 degrees btc dwell is between 26-31 I could sure use some help Thank You, sincerly Roger
AnswerHello Roger,
Several thoughts come to mind regarding your car. You didn't mention if you "read" the spark plugs for color, deposits or oil fouling. Matching plug condition to the dead cylinders is a first step toward diagnosing the problem.
Second, consider doing a Cylinder Leakdown to see what, if anything the valves are contributing to the low compression. This test pumps compressed air into each cylinder in the firing order at TDC. If you have air escaping from the cylinder through the carb., then you've got a valve problem.
Third, compression readings should be within 10% of one another for acceptability. While the rings could be a problem, at 59K miles, I'd be more suspicious of the valves. Continue your investigation of common characteristics of the "dead 4". I think they will point you in the right direction.
Best of luck,
Bob
