Wear at the boost regulator bore or the large end of the main regulator valve can cause low line pressure. Wear at the inboard end of the main regulator valve causes high line pressure.
Sonnax now offers an oversized valve kit for both the main regulator valve and the boost regulator valve with improved boost oil circuit and improved converter feed.
If regulated line leaks to exhaust at the pressure regulator, it creates a low pressure condition. Wear at the inner balance spools prevent the valves from stroking, which can cause high line pressure. Wear at the inboard bore also affects the K1 clutch circuit, which can result in 1-2 or 2-3 shift complaints. Wear at the inboard end of the boost regulator bore can reduce the ability of EPC/TV pressure to stroke this valve open. Full boost exiting this valve combines forces with the main regulator spring, increasing line pressure. Sonnax offers oversized valve kits for both the main regulator valve, 119940-03K, and the boost regulator valve, 119940-05K. These kits allow the valve bores to be refurbished.
Contact a Sonnax Parts Distributor.