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Old 01-20-2002, 12:23 AM
suginami suginami is offline
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,503
The continuing saga of the Check Engine Light

By searching the discussion forum, I learned that by pressing the button for 3 seconds (with the engine off and the ignition in the on position) and releasing, you count the number of flashes for the fault code.

I got 26 flashes, which would be the same code as last time, the upshift delay valve.

I determined that the green vacuum line was plugged, so I unplugged it, and replaced the switch (a $30.00 part).

Why would the code come back on?

I know that the upshift delay valve is working because it does keep my transmission from shifting into high gear when cold.

The only thing I can come up with is possibly the switch is not getting enough vacuum to work.

Does this make any sense?

I then cleared the code by pressing the button for 8 seconds and then releasing. The Check Engine light is now off.
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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