1962 Other Jaguar Models misfire, afterfire

1962 JAGUAR
100,000 MILES • 6 CYL • 2WD • MANUAL
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EDRIVER
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  • 1 POST
Is it possible that not enough valve clearance can cause a misfire and afterfire (out exhaust) when engine is run steady at higher rpms? It idles fine and revs easily. A valve job was just done and the valves must have seated some. The cold spec for the 4.2 liter is .004 intake and .006 exhaust and when I just checked them they were about .002 -.0025 on the intake and .003 -.005 on the exhaust. I'm restoring the car and it wasn't running when I got it. Almost everything on the motor has been rebuilt or is new. I've checked and rechecked everything I can think of but it won't run right. What do you think?
Bill
May 17, 2008 at 2:24 PM
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DAVE H
  • ✓ASE Certified Mechanic
  • 13,384 POSTS
  • ASE Certified Mechanic
valve clearence has to be exact
Jan 17, 2010 at 8:23 AM
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