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Old 05-17-2019, 01:51 AM
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Join Date: Oct 2015
Posts: 179
76 mercedes 280c vcv valve

does a 76 Mercedes 280c have a vcv valve? feels like my transmission 722.102 is in limp mode will not go pass 60mph

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Old 05-17-2019, 03:06 AM
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Join Date: Dec 2010
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I kind of thought a VCV was only found on diesels.
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Old 05-17-2019, 10:04 AM
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Join Date: Oct 2015
Posts: 179
vcv valve

ok any ideas about limp mode ? notice transmission stays in 2nd gear and defroster cuts out . not sure if theres a diagnostic plug for codes . or where to start. going to make a vacuum machine leak detecter . because none of my locks or seat lock work . what are the causes of limp mode ? 76 Mercedes 280c 114073 12 1067 61 vin number
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Old 05-17-2019, 11:59 AM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 4,692
You've got me confused. What are you calling a "VCV" valve?

There is a vacuum modulator, a "kick down" switch and the control rod on the transmission.

The modulator has a vacuum line leading from the rear of the intake manifold to the RH side of the transmission.

The control rod leads from the accelerator linkage to the RH side of the transmission.

The kick down switch is mounted beneath the accelerator pedal.

The only one of these which would/could prevent the transmission from shifting would be the kick down switch and I doubt it would prevent up-shifts but I've been wrong before. Try disconnecting it.

The smoke machine is a good idea. If you decide to make one I've got a surplus of the wire I'd be happy to send you. No charge.

Here's an DIY one. It is basically the same as the one I made.

“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
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