code 26 e320 1994
 

The green line off the s.o.v. holds a vac and the s.o.v. works with 12 volts applied to it. My question is what are the two yellow, look like one way valves? One feeds the s.o.v. and the other I don't know. They are located right by the s.o.v.
Any feed back would be helpful
Thanks Paul

If the green line is holding a vacum, then that is a good sign.

Arthur Dalton is really an expert on these cars.

Have you tried searching his posts? He has supplied a lot of info on upshift delay problems.

Thanks Suginami
I'll try that
Paul

Yes , that is a good sign.. in the sense that the problem is usually the actuator at the end of that vac line is ruptured ..but if it holds vac , it isn't.

The valves you mention are simply engine source vac check valves.

To check all funtions , one has to put a tee in-line and monitor a vac gauge through the windshield to verify ECU sig to SOV when car is cold, but there is a simple trick one can use to check the system working from the actuator back..
If you take the engine vac feed line to SOV, disconnect it at SOV, start engine and see if you have vac at this line [ this is a simple finger over hose end test] If yes, then couple that feed line to the line going to trans [grn one] , this test will have eliminated both the sov and the ECU from the system.. now, just take the car down the road and see if one has delay shift.. if NO, you have an actuator/cable problem..if yes, actuator/cable and line from SOV are verified working/good. You possibly have no vac feed to grn hose due to : broken line /sov stuck, or no ECU sig to operate sol on SOV. This will entail a voltage checks, etc.., but the first diagnosis should be actuator verification..

Thank You Arthur
I do have vac from the engine to the sov and I will try your other other instructions and go from there. Thanks for the information and letting me know that those yellow things are vac check valves.
Paul