R
Rick Morder
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Help, I've got an all stock 72 350 4bbl(q-jet), the darn thing has developed what at times seems to be a fatal miss (back fires out the exhaust), runs extremely rough, and sometimes dies. It will fire back up, clean itself out and run semi ok (if I drive easy),
I've gone thru the electricals, carburation,
fuel pump(6psi), vacuum (steady @ 15"), compression (150 psi). Now the interesting note: once while testing the compression on #5 cyl the pressure rapidly self relieved, I have a Sun compression tester with a vent switch and usually have to vent every cyl after checking, I've tried to get it to do it again but no luck, also the spark plug #5 has fouled on 2 occasions (all the others are fine), any thought on bent valve or worn springs, ps. the motor has 96000 orig miles and never been apart. Thanks
I've gone thru the electricals, carburation,
fuel pump(6psi), vacuum (steady @ 15"), compression (150 psi). Now the interesting note: once while testing the compression on #5 cyl the pressure rapidly self relieved, I have a Sun compression tester with a vent switch and usually have to vent every cyl after checking, I've tried to get it to do it again but no luck, also the spark plug #5 has fouled on 2 occasions (all the others are fine), any thought on bent valve or worn springs, ps. the motor has 96000 orig miles and never been apart. Thanks