Automatic (RE4FR01A) soleniod valves
10-03-2012, 08:23 AM
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Automatic (RE4FR01A) soleniod valves
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I purchased a very clean 93, NA Automatic (110K) Z32 that has issues with shifting to 2nd (uncontrolled or very high RPM shift points). Also, 3rd gear not engage at all at normal operating temp, OD works fine. No smelly trans fluid but a little dark (brown) in color. Have receipts showing the trans was rebuilt about 30K miles ago. FSM points to the the Trans Solenoid Valves. I check the solenoid valves resistance, they all check good. Removed the Trans Pan, no brass metal shaving seen in the pan. The trans-pan-magnetic does have a build up of "black particles" and the trans filter looks clean. Removed the Valve Body from the trans follow by removing the solenoid valves from the valve body check then check the solenoid valve with a 12 volt battery for operation.
Question.
I'm not sure if Control Shifting(A/B) Solenoids and Clutch Solenoids are any good. Both Line Pressure / Clutch Solenoids "sound very good" when applying a 12 VDC supply to each one. Applying the same test to either A/B Solenoids or Clutch Solenoid (small screw driver touching the very small valve plate) they are very weak in "Closing". Saying it another way, I'm wondering when trans fluid is moving through these valves, I'm not sure if these valve would close properly.
I purchased a very clean 93, NA Automatic (110K) Z32 that has issues with shifting to 2nd (uncontrolled or very high RPM shift points). Also, 3rd gear not engage at all at normal operating temp, OD works fine. No smelly trans fluid but a little dark (brown) in color. Have receipts showing the trans was rebuilt about 30K miles ago. FSM points to the the Trans Solenoid Valves. I check the solenoid valves resistance, they all check good. Removed the Trans Pan, no brass metal shaving seen in the pan. The trans-pan-magnetic does have a build up of "black particles" and the trans filter looks clean. Removed the Valve Body from the trans follow by removing the solenoid valves from the valve body check then check the solenoid valve with a 12 volt battery for operation.
Question.
I'm not sure if Control Shifting(A/B) Solenoids and Clutch Solenoids are any good. Both Line Pressure / Clutch Solenoids "sound very good" when applying a 12 VDC supply to each one. Applying the same test to either A/B Solenoids or Clutch Solenoid (small screw driver touching the very small valve plate) they are very weak in "Closing". Saying it another way, I'm wondering when trans fluid is moving through these valves, I'm not sure if these valve would close properly.
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