View Full Version : 2001 S40 T4 Turbo Loss?
afzalmj
Thursday 26th January 2006, 19:26
Hi
Have a very strange problem, which I think may be related to low idle (it is triggered by low idle).
Start the the car, drives fine, turbo kicks in normally. However, once FULLY warm and if left to idle for 3 mins, and then take off again, the turbo no longer functions. Its as if the ECU has restricted the power (flat acceleration). Sometimes this happens whilst driving too (I assume if the revs get low enough over a longer period of time, it is the same problem).
The interesting thing is if I turn the car off and then on IMMEDIATELY when this happens, the problem goes away and I get normal boost back. But then it will happen again if left to idle for 3 mins or randomly whilst driving. This leads me to believe the fault is electrical, and not mechanical, as the act of turning it off/on straight away seems to 'reset' it.
I also did a little test. I pulled over when the car was warm, and put my foot on the gas so it was idling over 1000RPM. I did that for 3 mins and then took off. Turbo was fine! No power loss. So leads me to believe something happening due to too low idle.
I think my car is idling at 400-500RPM when fully warm (see the picture). Is this correct? Does the picture show this?
This problem is really annoying me!! I've replaced the MAF too, no luck . Any ideas?
I'm based near London so anyone in South east can help out?
Thanks,
Afzal
GATHY
Thursday 26th January 2006, 19:38
your cars ticking over at 700 according to that pic which is right enough same as my old phase 2 t4 ive recently sold
is the engine management light on ? if not
take your turbo intercooler pipe off and spin the turbos spool by hand to see if there a problem there (could be getting stuck or cream crackered
should be smooth and free
either way i would have thought the ecu light would be on
S40xs
Thursday 26th January 2006, 19:43
Ok think i can help you out here fella, mine's been doing exactly the same problem, ok so mines not a turbo but according to the Volvo specialist the ECU requires the software upgrading.
Bearing in mind i haven't had the chance to have my ecu's software re-jigged or what ever the hell they call it so i can't say for sure but Hallmark Volvo seemed very confident in this sorting it - was quoted around 30quid. I was informed this earlier this month when mine was in for a service.
Hope this helps.
afzalmj
Thursday 26th January 2006, 22:03
Thanks for the quick replies...
S40XS, you said yours is having exactly the same problem. What exactly is happening on yours? Since yours is not a Turbo, i just want to be sure that we are experiencing the same problem!
What year is your s40?
S40xs
Thursday 26th January 2006, 22:35
2000 1.6
Once the car has warmed up it tends to do a couple of things, for instance if i stop at a set of lights then pull off theres no pull then after about 10 seconds the power will kick in (which when trying to zip accross traffic can be dangerous as the car will roll at about 10mph then it will take off.
I have had the car stall once or twice over the past year on the motorway cruising at around 60/70mph - which does worry me. Also i have noticed mine idling pretty much the same as your but the car doesn't half judder at times.
Another thing when my car did go infor a service he enquired to it being the mitsubishi engine as it a common problem as i recall - hence he said to me he would clean the throttle cable (which i believe he did).
The engine managment light has blinked at me a fair few times too but stopped after i revved the ££££££££ off it.
Can Adam or Hamish shed any light on this. - Pm'd Adam BTW.
volvotuning
Friday 27th January 2006, 09:01
Without seeing the car it's impossible to diagnose! What are the fault codes?
Adam.
markt4
Friday 27th January 2006, 09:12
you made it here then afzalmj...im sure some one will help you out
afzalmj
Friday 27th January 2006, 10:07
Thanks for the help.
There are no fault codes. You can't here the distinctive sound of the turbo when the problem occurs and you don't feel any 'pull'. However, if you switch the car off/on instantly, it works fine again.
Something must be resetting a sensor/ECU when the car is turned off/on for it to work again properply. Volvo MasterTech looked at it and acknowledged the problem, but had no idea of what could be wrong, and said need to keep it in for a few days.
Considering getting another ECU fitted...do you think that would help? I don't know what software has been put on, but I know that the ECU has not been upgraded since the car was manufactured (2001). Maybe there are later software updates out there? My local Volvo dealer won't upgrade it for me as they say they can't! Do you know if Superchip'ing it would work? Or where can i get Volvo to Upgrade it for me?
Its annoying me!
Thanks for all the help,
Afzal
S40xs
Friday 27th January 2006, 10:37
If you want chipping mate volvotuning above is the best bet in the UK as most people swear by them on here.
S40xs
Friday 27th January 2006, 10:39
Without seeing the car it's impossible to diagnose! What are the fault codes?
Adam.
As afzalmj said, no fault codes (well that i know of)
afzalmj
Friday 27th January 2006, 21:19
I almost got a replacement ECU today, but then realised that I may run in to complications with key fobs (they may need to be reprogrammed) and the breaker wouldn't sell it to me until I confirmed my ECU's part number and whether volvo can reprogramme the key.
Bought some fuel cleaner, am driving with it now. Will see if it improves anything.
The key to all this is the fact that turning off/on 'resets' the problem => most likely an electrical failure of some sort with a sensor maybe.
I removed the short hose from Turbo to the longer intercooler pipe (the only one I could get to), and looks absolutely fine. I had a peek inside the turbo from the top, and its dry as a whistle. Also suprisingly clean at that air inlet! So assuming no leaks => turbo is ok.
The breaker mentioned something interesesting which could be the culprit. He said check the turbo control solenoid (I'm assuming thats the same as the turbo control valve located behind the air filter). Could a faulty TCV be causing this problem? I disconnected it and again it gave similar performance to when the problem occurs.
What do you think?
Thanks
Ross9
Saturday 28th January 2006, 19:27
If it does the same thing with the controller disconnected as it does when the fault occures, theres a good chance theres something up with the plug for it, or the controller itself, worth a try, be cheaper than an ECU anyway.
Ross
S40xs
Friday 17th February 2006, 21:13
Did you ever find a solution to the problem here?
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