Re: F-20 missing issue for you advance problem sol

Posted by El Toro on June 13, 2004 at 05:46:01 from (205.188.117.22):

In Reply to: F-20 missing issue for you advance problem solvers posted by Pete L on June 12, 2004 at 06:33:26:

Hi Pete, Did you check that valve lash for correct clearances? If the engine still misses
after adjusting valves pull one plug wire off at
a time to see if you can determine which cylinder
is missing.

If that cylinder head has had numerous
valve jobs, the valve seats may be to deep in the
head and should've had inserts installed. Run a compression check on all cylinders with the throttle wide open, the readings should be very close to one another. Did you use new valve springs? A weak valve spring will cause a miss.
I had a 57 Chevy that had a miss and I checked everything, but never could find the problem until
the spring broke. After replacing the spring it cured the miss. When I did the head I used the old springs, I always used new springs after that.
I know they say you can use valves when the valve
thickness are 1/32" thick. I replaced exhaust valves if they're that thin. Update us if you find the problem. Hal

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