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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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1997 V70r really rough idle and surge on startupViews : 1346 Replies : 20Users Viewing This Thread : |
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#1 |
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Last Online: Jun 13th, 2024 15:06
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Location: Sheffield
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My V70r surges at high revs on starting, then settles into a really rough idle at low revs, almost stalling point.
On acceleration or at speed, it's fine, but as soon as I take my foot off the gas or come to a stop, the rough idle returns. It even cut out the other day, going downhill, which was scary. It started doing this fairly recently but seems to have got worse. No warning lights on the dash. Any ideas? I read something on another forum about vacuum lines causing poor idling but not sure what I'm looking for. I had the battery out recently and had both O2 sensors replaced last week but I don't think that should affect it(?) - I've had the battery out before with no problems. EDIT: a couple of times I noticed the brakes felt 'weird' - I had to push on the pedal more than normal to get effective braking. They worked OK but weren't as 'instant' as usual. However, that was on 2 or 3 occasions, most of the time they felt OK. Could be connected to the other issue? Don't the brakes have a vacuum link?
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Saffron Volvo V70R 1997 2.4 Auto Last edited by Yog Sothoth; May 8th, 2024 at 13:42. |
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#2 | |
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Last Online: Today 22:08
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The first photo is from my 98 V70R, so it should look like yours. The TCV lives underneath/near the air filter box and turbo intake pipe. My air filter box has been removed so you can see the TCV pointed by the red arrow. TCV_1.jpg The second photo is a close up of the TCV, with its three connections and the power socket. TCV_2.jpg The third photo/diagram shows the routing from the TCV. TCV hose connections.JPG Check for signs of cracking on the three vacuum lines and replace if necessary. I'd also check the turbo intake pipe is in good condition and check the vacuum lines from the TCV to the turbo intake pipe connections are secure too. I'd very much doubt the brakes would relate to the erratic idling, but more experienced forum members can advise on that. I hope that helps as a start. |
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#3 |
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Last Online: Jun 13th, 2024 15:06
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Brilliant. I shall check that this weekend. Thanks.
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Saffron Volvo V70R 1997 2.4 Auto |
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#4 |
Premier Member
Last Online: Jun 13th, 2024 08:46
Join Date: Jan 2011
Location: Horne (Nr. Horley)
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As above, but the braking problem sounds like loss of vacuum to the brake servo, so I'd be checking that pipework too.
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#5 |
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Last Online: Jun 13th, 2024 15:06
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Quick question: are the vacuum pipes shaped or formed, specific to the car? Or will generic pipes be OK if needed?
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Saffron Volvo V70R 1997 2.4 Auto |
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#6 |
Premier Member
Last Online: Jun 13th, 2024 08:46
Join Date: Jan 2011
Location: Horne (Nr. Horley)
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The small bore ones that go to the TCV for example are generic straight piping, can't tell you about the Servo pipes, I'd guess straight generic but not sure offhand.
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rough idle, v70r |
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