Volvo T6 Turbo
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Discussion Starter · #1 ·
I have a 2004 XC90 T6 with 45,000 miles. On full acceleration at highway speeds the engine would surge. My dealer could not find a problem as there were no codes stored. I read on this forum that others with this problem had the Turbo Control Solenoid, P/N 30670448-7 replaced when they had this condition. My dealer agreed to change this solenoid and I could not believe the difference in power. The power increase is not only at highway speeds but around town also. If your T6 is experiencing this problem, run don't walk to your dealer and replace the solenoid valve.
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Re: T-6 Turbo Valve Problems (MikeKal)
Not only will you experince increased power but you will also notice better fuel economy.
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Re: T-6 Turbo Valve Problems (MikeKal)
| Quote, originally posted by MikeKal » |
| I have a 2004 XC90 T6 with 45,000 miles. On full acceleration at highway speeds the engine would surge. My dealer could not find a problem as there were no codes stored. I read on this forum that others with this problem had the Turbo Control Solenoid, P/N 30670448-7 replaced when they had this condition. My dealer agreed to change this solenoid and I could not believe the difference in power. The power increase is not only at highway speeds but around town also. If your T6 is experiencing this problem, run don't walk to your dealer and replace the solenoid valve. |
Many thanks for this very helpful note.
A couple of weeks ago I noticed that my wifes 2003 T6 was surging under heavy throttle. I don't drive it often and it's probably been doing this a long time. She doesn't get in to the throttle the way I do. It was as though I was modulating the throttle going full, then easing off, then full, then easing off on about a 5 second cycle. It was very annoying. Based on the information you provided here I ordered the Turbo Control Solenoid, P/N 30670448-7 online from a dealer and replaced it myself. It was only $52 delivered to my home and I figured it was worth a shot. It would cost more than that to have the dealer even look at my car and then they don't discount locally on parts and obviously charge alot for labor as well.
This was the easiest part to replace I could imagine. It is front and center up high under the hood between the airbox and the drivers side headlight. You swap three vacuum hoses and the wires and your done. It took me 15 minutes because I was being careful to understand each connection and how to disconnect it properly without breaking it, but that was it.
The surging is done and she's running great! $52 bucks.
If your turbo is surging as I described above, I would suggest this "repair" before spending a ton at the dealer.
http://********************/smile/emthup.gif
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Re: T-6 Turbo Valve Problems (MikeKal)
Would this surging phenomenon also be noticed when accelerating from a full stop? My wife's XC90 often will seem like it hesitates briefly under normal throttle, after which is starts to pull as I'd expect.
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Re: T-6 Turbo Valve Problems (nsany)
I don't think the symptoms you're describing are the same and so I am not sure it would address it.
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Re: T-6 Turbo Valve Problems (Volvoneophyte)
I wonder if there is a way to test the operation of this valve?? Is it just an on/off valve, or is there a variable voltage going to it? If it operates the wastegates i would expect it just to either open or close them, so if i put 12v to the valve it should open?? What do you guys think?
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Re: T-6 Turbo Valve Problems (Chris Hays)
My 04 has been doing the surge thing under hard accel. for quite some time now. I'm hopeful this is a quick and easy solution. I ordered the IPD part that is marketed as heavy duty and quicker response than the volvo part. It was $97 after shipping. It's backordered until Sept. 1, but I report on the results...knock on wood.
http://www.ipdusa.com/version....10729
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Re: T-6 Turbo Valve Problems (wsu_cougars)
Intalled the IPD turbo control valve last night. The surging is gone. The turbos seem to come on a little quicker now and they certainly make a little more noise. I'd recomend this part for anyone experiencing "the surge".
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Re: T-6 Turbo Valve Problems (wsu_cougars)
I'm very interested in this. I think I understand the "surge", but can someone explain it?
wsu: Have you noticed an overall quicker-to-respond-to-the-gas-pedal T6?
Thanks
Tim
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Re: T-6 Turbo Valve Problems (t6tim)
Also, I saw this comment on the IPD site:
All turbocharged cars 1998 and up.
*A boost gauge is recommended for use with the Ipd HD TCV*
Is a guage really needed?!
Tim
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Re: T-6 Turbo Valve Problems (t6tim)
Tim, how to describe "the surge"? Under passing conditions, some hill climbing, or otherwise hard accelleration, the car would modulate between normal power and reduced power on about 1 second intervals. I always suspected a turbo system issue becuase you could hear the turbos spool and unspool during the modulation. I didn't happen often, but when it did it was noticable.
I do notice a quicker throttle response now. My wife describes the car as feeling lighter.
The IPD instructions that come with the TCV are more detailed than the website and include instructions on how to adapt the new part to Volvo's learning engine management software. The disclaimer recomends a boost gauge, but goes on to say that it is not required. I understand that overall boost of the turbos is unchanged, but they respond quicker with this part. The stock Volvo engine management is retained including the torque and boost limits to protect engine/trans.
I'd do it if you're experiencing "the surge"! It's an inexpensive and quick modification that will get noticable results.
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Re: T-6 Turbo Valve Problems (MikeKal)
| Quote, originally posted by MikeKal » |
| I have a 2004 XC90 T6 with 45,000 miles. On full acceleration at highway speeds the engine would surge. My dealer could not find a problem as there were no codes stored. I read on this forum that others with this problem had the Turbo Control Solenoid, P/N 30670448-7 replaced when they had this condition. My dealer agreed to change this solenoid and I could not believe the difference in power. The power increase is not only at highway speeds but around town also. If your T6 is experiencing this problem, run don't walk to your dealer and replace the solenoid valve. |
There are many threads on the R forum that talk about the TCV. Here is a recent one for your reference:
http://forums.swedespeed.com/zerothread?id=94457
Some guys have installed an in-line filter on the raw boost line (red) and have, so far, saved their TCV's. A lawn mower fuel filter seems to do the trick. Many R-guys use a Brigs&Straton 75micron filter p/n 394358S (it's around $3 from the Sears parts centre).
LTA
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Would this solenoid problem be potentially exhibited in the 2.5T as well?
My wife noted a "hesitation" when accelerating recently. I only drive it occasionally when we're out together on the weekends.
I had opportunity to drive it this weekend and it was noticeable only on hard acceleration when passing.
Intermittant surge, as if there were insufficient fuel delivery or boost from the turbo.
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Re: (1sttimevolvo)
| Quote, originally posted by 1sttimevolvo » |
| Would this solenoid problem be potentially exhibited in the 2.5T as well? My wife noted a "hesitation" when accelerating recently. I only drive it occasionally when we're out together on the weekends. |
The 2.5T shares the same TCV (same p/n) so it could very well be.
Regarding my note about adding an inline filter on the raw boost side, I'm no longer so sure that's a good idea, since it left unchecked for any lenght of time it could become plugged up, effectively blocking the raw boost line, which could lead to overboost which is bad.
Quoting Lucky at 6:18 PM 9-4-2008 "If the red turbo pressure line has a filter in it and the filter clogs the car could overboost dangerously." http://forums.swedespeed.com/z...72908
On another note, you could try cleaning your TCV...
The TCV in my R was begining to become suspect because on occasion under WOT I would feel a very, very slight hesitation. So I took the TCV out of my R last week and blew some carb-cleaner through it while repetedly activating the solenoid with 12V. Nothing much came out, maybe a dozen specks of black 'stuff'. I don't think mine was too dirty though. Howerver, I did notice a slight change in the sound when activating the solenoid after cleaning it (after it dried). It still sounds kind of dull when it activates but the sound was more dull before flushing it so there was a slight improvement and so far after week of dropping the hammer I didn't notice any hesitation (but remember that I don't think that my TCV was not too dirty).
LTA
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Re: (1sttimevolvo)
| Quote, originally posted by 1sttimevolvo » |
| Would this solenoid problem be potentially exhibited in the 2.5T as well? My wife noted a "hesitation" when accelerating recently. I only drive it occasionally when we're out together on the weekends. |
The 2.5T shares the same TCV (same p/n) so it could very well be.
Regarding my note about adding an inline filter on the raw boost side, I'm no longer so sure that's a good idea, since it left unchecked for any lenght of time it could become plugged up, effectively blocking the raw boost line, which could lead to overboost which is bad.
Quoting Lucky at 6:18 PM 9-4-2008 "If the red turbo pressure line has a filter in it and the filter clogs the car could overboost dangerously." http://forums.swedespeed.com/z...72908
On another note, you could try cleaning your TCV...
The TCV in my R was begining to become suspect because on occasion under WOT I would feel a very, very slight hesitation. So I took the TCV out of my R last week and blew some carb-cleaner through it while repetedly activating the solenoid with 12V. Nothing much came out, maybe a dozen specks of black 'stuff'. I don't think mine was too dirty though. Howerver, I did notice a slight change in the sound when activating the solenoid after cleaning it (after it dried). It still sounds kind of dull when it activates but the sound was more dull before flushing it so there was a slight improvement and so far after week of dropping the hammer I didn't notice any hesitation (but remember that I don't think that my TCV was not too dirty).
LTA
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Re: (LTA)
Thanks very much. I'll try cleaning it first and proceed from there. http://********************/smile/emthup.gif
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Re: (1sttimevolvo)
Since mine is under warranty i got the dealer to check the issue while it was in for other stuff, (thought i could get a free replacement solenoid), but instead they told me the issue is caused by out dated software and a software upgrade will fix it. They did the update and the hesitation seems to have gone but i don't really notice an increase in performance. If the issue comes back i think i will go for the IPD valve next time.
Source: https://www.swedespeed.com/threads/t-6-turbo-valve-problems.45225/
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