On certain vehicles, there may be cleaning liquid residue left between the connecting rod bolts and the holes, due to improper procedure in removing the cleaning liquid at the time of installing the connecting rods, and therefore, the surfaces of the bolts may corrode. If this problem is left unattended, small cracks may occur in the bolts, and in the worst cases, the bolts could break, causing the vehicle to stall. (This applies to L type diesel engine vehicles.)