1997 Chev Cavalier
2.2 L OHV (lifting rod) engine.
installed a Jasper Remanufactured Engine. After a few days of driving,
Check Engine light came on. OBD2 scanner pop's code 0301 (Cyl # 1
misfire). I'll clear the code with the scanner, but the Check Light
comes back the next day.
I can't hear any distiguishable misfire at idle or higher RPM.
I put new plug wires on when I did the engine swap, and I have since
This was a self-install on the engine swap, so I first suspected that
I'd need to re-torque the intake manifold bolts. So I opened the valve
on a butane torch bottle and waved it around the intake to head
junctions, but no change in RPM, so presumably no leaks.
has me stumped.
I can't hear any misfires. Does anyone know how many misfires / 1000
revolutions it takes to trip the 03xx code and Check Engine light?
also, there is a little valve noise when the engine is cold, but
lessens when the engine has warmed. could shallow valve clearence
(open) cause a misfire, and are there valve adjustments on a
non-overhead cam engine?