Engine - Rough Idle or Stall After Cylinder Head R & R
Number 86-6 (Gasoline)-77 Date 6/87Subject: ROUGH IDLE OR STALL AFTER HIGH RPM, AFTER REPLACING CYLINDER HEAD
1982-86 SUNBIRD MODELS WITH LH8 1.8L ENGINE (VIN CODE 0)
A condition could occur, after cylinder head replacement, of stalling or rough running after quickly returning to idle from high R.P.M.
This may be caused by forgetting to transfer the valve spring seats to the new head. Failing to transfer the spring seats greatly reduces the valve spring pressure and may allow the lash adjusters to hold the valves open under high oil pressure conditions.