Engine 850: B5234T/2.3/20v/T5: - Signs of a failing turbo?

hrj01 · Apr 1st, 2018, 01:24

Folks,

The car is a 1999 T5 with the fly by wire throttle which was replaced 30k miles ago and has done 150K in total.

Occasionally when accelerating I am getting what I can only describe as a pause for a few seconds and then it carries on as if nothing has happened for a few days and then does it again. Its not the usual turbo lag. The car is a keeper so I dont mind spending a few bob to keep it running

I am assuming as there are no error messages, the problem must be mechanical rather than electrical ie the turbo?

The car has just been serviced and it still does it. The mechanic has also noticed the problem and says wait until I get an error code and take it from there.

Has anyone experienced anything like this before and was it the turbo or something else.

Any help will be appreciated.

Regards Brian.

SteveSarre · Apr 1st, 2018, 17:46

Hi Brian

When it pauses, does it keep running but loses power? Or does it cut out completely?
Is the speedo behaving normally?

I think I had occasional loss of power, accompanied by erratic speedo, when the ABS module electrics went wrong (in a 1999 T5). ABS module is a fairly common fault.

I don't think it threw any codes, but I can't be sure.

Hope that helps,
Steve

hrj01 · Apr 1st, 2018, 21:12

Steve,

Thanks,

It loses power, it doesn't cut out. The speedo looks to be functioning ok, but I will keep an eye on it.

Brian

Cookeh · Apr 21st, 2018, 08:32

Sounds similar to a fault I had, turned out to be some split vacuum lines on the turbo, was months ago now so cant remember exactly which ones though.

byootox · Apr 21st, 2018, 20:25

The Boost control solenoid and 3 pipes coming off it are a good place to start looking.
If it's still running the original boost control pipes they will be marked red, blue & yellow on them.
Red one goes from compressor on turbo to valve.
Yellow one goes to the wastegate on turbo to valve.
Blue one goes from valve to the plastic air intake between airbox and turbo inlet.
The boost valve can get lazy/sluggish with age.

Apr 1st, 2018, 01:24	#1
hrj01 New Member Last Online: Jan 13th, 2019 20:51 Join Date: Aug 2007 Location: Ware	Signs of a failing turbo? Folks, The car is a 1999 T5 with the fly by wire throttle which was replaced 30k miles ago and has done 150K in total. Occasionally when accelerating I am getting what I can only describe as a pause for a few seconds and then it carries on as if nothing has happened for a few days and then does it again. Its not the usual turbo lag. The car is a keeper so I dont mind spending a few bob to keep it running I am assuming as there are no error messages, the problem must be mechanical rather than electrical ie the turbo? The car has just been serviced and it still does it. The mechanic has also noticed the problem and says wait until I get an error code and take it from there. Has anyone experienced anything like this before and was it the turbo or something else. Any help will be appreciated. Regards Brian.

Apr 1st, 2018, 17:46	#2
SteveSarre Premier Member Last Online: Apr 17th, 2024 17:43 Join Date: Oct 2004 Location: London/West Country	Hi Brian When it pauses, does it keep running but loses power? Or does it cut out completely? Is the speedo behaving normally? I think I had occasional loss of power, accompanied by erratic speedo, when the ABS module electrics went wrong (in a 1999 T5). ABS module is a fairly common fault. I don't think it threw any codes, but I can't be sure. Hope that helps, Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

Apr 21st, 2018, 08:32	#4
Cookeh Premier Member Last Online: Sep 14th, 2022 17:04 Join Date: Jan 2018 Location: Derbyshire	Sounds similar to a fault I had, turned out to be some split vacuum lines on the turbo, was months ago now so cant remember exactly which ones though. __________________ 1995 Volvo 850 T5 Estate (Manual)

Apr 21st, 2018, 20:25	#5
byootox Premier Member Last Online: Dec 20th, 2021 23:22 Join Date: Oct 2012 Location: Edinburgh	The Boost control solenoid and 3 pipes coming off it are a good place to start looking. If it's still running the original boost control pipes they will be marked red, blue & yellow on them. Red one goes from compressor on turbo to valve. Yellow one goes to the wastegate on turbo to valve. Blue one goes from valve to the plastic air intake between airbox and turbo inlet. The boost valve can get lazy/sluggish with age. __________________ 99 V70 T5

Apr 1st, 2018, 21:12	#3
hrj01 New Member Last Online: Jan 13th, 2019 20:51 Join Date: Aug 2007 Location: Ware	Steve, Thanks, It loses power, it doesn't cut out. The speedo looks to be functioning ok, but I will keep an eye on it. Brian

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