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Old 08-11-2014, 03:20 PM
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Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,874
How important is it to replace a defective VCV?

I'm pretty sure that, on my 91 300D, I have a defective vacuum control valve. As I have neither the patience nor fine motor skills to attempt Sixto's R&R (PeachPartsWiki: Anatomy of a Transmission Vacuum Control Valve) nor the desire to drop $493 on a new one, I'm wondering what the risks are simply living with it as is. Only symptoms are mild shift bumps at low speeds and difficulty in retracting the headrests. I suppose that potential concerns are the extra strain on the pump and the long-term effects of those shift bumps.

Thoughts?

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06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

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