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Old 04-03-2002, 09:36 AM
Okiebenz Okiebenz is offline
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Join Date: Mar 2002
Location: Oklahoma, U.S.A.
Posts: 34
Upshift Delay Valve

Originally posted by chandrab
OkieBenz - What are the symptoms you are experiencing....I've had some upshift delay problems when cold on my 94 C220.
I appreciate the responses to my post. Reference the note from moderator M.B. Doc, my question does indeed have to do with a P1700 Upshift Delay Switchover Valve Control code. I was told that the valve probably was defective since the vacuum line to it was disconnected (at the vacuum source) and it was determined that the "switch would not hold vacuum". The only symptom that I notice is that the "Check Engine" light is on. I do not detect any problem in performance, upshift points, etc. which may only mean that the design of this system is more sensitive or responsive to temperature conditions than I can detect.
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