Excessive OE plunger valve and bore wear results in high line pressure conditions. Excessive wear of the OE pressure regulator valve and bore may cause low, high or unstable line pressure issues. When installed, the Sonnax pressure regulator valve repair kit, 120940-01K, restores correct pressure regulator and plunger valve operation to provide appropriate line pressure for all operating conditions.
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Vacuum tests at the ports indicated (A, B, C & D) do not hold 18" or if a Wet Air Test at the same locations result in leaking at the corresponding ports.