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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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Engine Service Require - ECM6805Views : 27136 Replies : 51Users Viewing This Thread : |
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Jan 8th, 2010, 22:11 | #21 | |
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Jan 8th, 2010, 22:45 | #22 |
XC90 Exec
Last Online: Jan 3rd, 2019 09:06
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Ok thanks - that's what I was told it was called anyway? So what's the 'turbo control valve' - is that what I've been told is the 'governor'??
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Jan 8th, 2010, 23:42 | #23 |
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I just suffered a similar problem today with my 04 D5. I changed the air filter last week, but with all the bad weather I haven't been using a lot of throttle. However today I came home during daylight and was able to use a bit more power at times. When accelerating hard it goes into limp mode and shows Engine Service Required with a red light. Switch off and it resets - until I accelerate hard again. I haven't got a code reader, but the problem sounds similar.
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Jan 9th, 2010, 00:11 | #24 | |
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Last Online: Jan 29th, 2019 22:42
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It controls the vacuum to the variable vane turbo (the vanes alter their pitch to control the turbo speed and therefore controlls the boost pressure). It is located on the front of the engine block just below the fuel rail. The 90degree black intake hose has to be removed to gain access to it. |
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Jan 10th, 2010, 12:16 | #25 |
XC90 Exec
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Jan 15th, 2010, 00:49 | #26 |
Master Member
Last Online: Apr 23rd, 2024 17:43
Join Date: Apr 2007
Location: St Helens Merseyside
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FWIW
I too get this occasionally - I repalaced the intercooler a couple of months ago, as it was split, and have tried a ne turbo conwtrol solenoid with no joy. I am convinced however, that mine is down to a vacuum leak. The way the turbo VNT works, if there is zero or low vacuum, then it produces none, or low boost, and the fact that boost is therefore not what is expected when monitored by the sensor in the intercooler, I think it triggers the ECM6205 code... I have on order a Mityvac MV8500 http://www.tooldesk.com/automotive/M...e-Bleeder.aspx And a Draper vesion of the Gunson Lo Gauge (identical, half the cost) http://www.gunson.co.uk/item.aspx?item=1827 I fully intend to get to the bottom of this, as my vac hoses look like they have poor connections where they meet tees and connectors to solenoids.. I am going to manually apply a vacuum to the VNT turbo's control mechanism, thereby forcing it into max boost mode, to see if this changes the way my problem manifests itsef, as I am pretty sure I am now getting zero boost below 2500rpm... Will post updates... Mike |
Jan 15th, 2010, 18:43 | #27 |
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You might find the rings cracked in the turbocharger which control the variable blades if you feel little boost below 2500 rpm ... This will restrict the vanes from moving ..
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Jan 15th, 2010, 20:18 | #28 | |
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Last Online: Jan 29th, 2019 22:42
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You can use your vac pump directly on the turbo/vvt actuator. Pull down a vac and the vvt rod will pull into the actuator. Slowly release the vac and watch the rod as it moves back, look for it sticking. Cary out this test on both a cold and hot engine. If the rod sticks when the vac is released then it will most proably be a broken vvt control ring inside the turbo as Clan mentioned. |
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Jan 16th, 2010, 05:04 | #29 |
Master Member
Last Online: Apr 23rd, 2024 17:43
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Yup, my plan is to test the mounts and manually operate the turbo actuator too, although I am going to go one stage further and appply a vacuum to the turbo and then drive to see if the low end boost returns - I really do think it is a vacuum leak somewhere, as above 2500-2750 rpm the motor performs faultlessly and pulls like a train, but there is a definate "build up" of boost around that rpm range, almost as if enough vacuum is building to operate the turbo - Does anyone know where the vac pump is on the D5 btw, can't see any reference to it in Vadis....
Mike |
Jan 16th, 2010, 09:38 | #30 |
Experienced Member
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The vacuum pump is on the end of the exhaust camshaft . why dont you connect a vacuum gauge to the turbo actuator and see whats going on as you drive?
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