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1999 V70 AWD Replacing TCV with bad exhaust

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deardeergod
Posts: 16
Joined: 05 Jan 2016, 13:06
Year and Model: 1999 V70 AWD
Location: Cincinnati, OH
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Post by deardeergod »

I'm currently trying to solve some engine codes, a couple are from a bad turbo control valve (P0236 and P0237). The car is making very little boost right now and I ordered a new TCV and tubing to replace the old lines.

The car also has a bad exhaust (clogged cat, running rich). I have plans to fix the exhaust in a month or so. Would it be bad to replace the TCV while the exhaust is still a mess? If the turbo suddenly starts making a lot more boost would I risk damage to it or my engine with a bad exhaust?

Thank you for the input.

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wizechatmgr
Posts: 1800
Joined: 12 Jan 2017, 13:07
Year and Model: 1999 V70 XC AWD 2.4T
Location: Albany, NY area
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Post by wizechatmgr »

The TCV only controls the wastegate on ours. The blow-off (CBV) is run directly from the intake manifold.

With the back pressure from the bad/clogged/melted cat I wouldn't expect good boost. We have low pressure turbos.
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD 2.4 T -- ~231k miles
1998 V70 2.4 NA -- ~184k miles

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