Symptoms:

  • Low line rise
  • Low line rise in Reverse & shudder
  • 1-2 Quality poor
  • Delayed Reverse

Cause:

Worn boost valve sleeves allow EPC, TV boost or Reverse pressures to cross-leak into exhaust.

Correction:

Sonnax boost valve kit is hardened and anodized to prevent wear and are tightly toleranced to restore the hydraulic integrity of the circuits.

Warning:

The applications listed are meant as a guide only. Be sure to measure original valve and compare dimensions before purchasing.

F4A-EL, F4EAT, GF4A-EL

Boost Valve Kit
Part No. 74846-01K

No TV cable, electronic transmissions, factory style sleeve, no O-rings

You need this if... View Instructions Find a Distributor

Vehicles with Mazda F4A-EL, F4EAT or GF4A-EL transmissions may have problems with low line rise or low Reverse boost. These problems can be caused by worn boost valve sleeves that allow EPC, TV boost or Reverse pressures to cross-leak or leak to exhaust. Sonnax boost valve kit 74846-01K restores hydraulic integrity.

  • Hardcoat anodized aluminum valve combats premature wear
  • Sleeve manufactured from high quality aluminum resists wear
  • Valve
  • Sleeve
  • F4A-EL, F4EAT, GF4A-EL Boost Valve Kit 74846-01K
  • F4A-EL, F4EAT, GF4A-EL Boost Valve Kit 74846-01K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

F4A-EL, F4EAT, GF4A-EL Boost Valve Kit Vacuum Test Locations