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#1
01-30-2006, 09:44 PM
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1994 e320 Code 26 Question
Check engine light came on. Using the built-in diagnostic tool, I count 26 flashes. No other codes. Car seems to run fine. I understand this is likely the upshift delay circuit, meaning either the valve, the green vacuum line, or the part on the transmission is faulty. Transmission was rebuilt and has a one year warranty still in effect. Is the transmission part considered part of the rebuilt transmission? Should I go ahead and replace the cheap valve and green hose anyway, see if problem goes away, and only then go after the transmission part? Or ignore problem entirely. Advice please. Car has 120,000 miles on it.
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Chip Johnson 
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#2
01-30-2006, 11:49 PM
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Is the shift delay working?
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#3
02-04-2006, 04:16 PM
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As a matter of fact I don't think it IS working >
I had to wait until today since it is my wife's car. Even stone cold the transmission shifts from 1-2 at very low rpm. I also notice that accelerating moderately in the low end of 2's range the engine seems to have little power and there is a vibration - it clearly does not feel happy. All other gears seem fine and downshifts at speeds over 40 are fine.
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Chip Johnson
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#4
02-04-2006, 04:54 PM
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The delay on that chassis is from 2 to 3 .
before replacing the valve , just jumper the 2 hoses at the SOV and see if the shift delays. That helps pinpoint the location of the fault........ Archieves...
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#5
02-04-2006, 04:57 PM
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Diagnosis is simple. The device that manipulates shift point is a vacuum element controlled bellcrank at the base of the control pressure cable. Follow the vacuum line from the vacuum element to the switchover valve. Disconnect and apply vacuum. Does it hold. Probably not, number one failure is the vacuum element itself. If it holds, go to the other side of the switchover valve and take the source vacuum line off and run the motor, doe sit have vacuum.
If you got this far and have no problem, tee in a vacuum gauge and wait till cold. Tee it on the transmission side of the switchover valve. Vacuum shoul appear when cold due to the control signal turning on the switch over valve. No control verify the circuit. As a last step place a vacuum on the element and see if the trans shifts latter. The vacuum element is adjustable and I have seen them installed but so far out of adjustment that the computer still didn't see the rpms necessary for the first shifts.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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#6
02-04-2006, 05:56 PM
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