Quote:
Originally posted by C32AMG
The most common cause is a vacuum leak, hoses on the vacuum supply check valve going to the switchover valve.
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The switchover valve is mounted on the firewall behind the brake master cylinder.
It has a black wire going to it (electrical) and a green hose (vacum).
You can apply vacum to the green line to see if the upshift delay valve holds vacum. If it doesn't, it's either the line or the valve itself.
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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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