Turbo or accelerator sensor issue?

371 Views 28 Replies 2 Participants Last post by Davipon, 3 d ago

Davipon

Discussion Starter · 1 mo ago

Hello. My 2014 manual Tekna seemed to loose the turbo yesterday. Has been fine for the month or so I've had it. But heading back after an 80 mile run it wouldn't accelerate past 20000 ish revs and would slowly get up to a reasonable speed by changing up the gears. No kick down (if that's the correct phrase) at all. No dash lights other than normal. Didn't want to stop and try anything as I had the missus and dog with me so thought I'd best get home. Once on the drive I turned engine off and after 15 minutes tried again and all fine. Any thoughts please. Not too technical though.......

Thanks in advance.

1 - 20 of 29 Posts

landmannnn

· #2 · 1 mo ago

It went into limp mode, limiting rpm to 2k. If no codes, I wouldn't worry too much, it's common on many vehicles to get limp mode for no reason...

Davipon

Discussion Starter · #3 · 1 mo ago

landmannnn said:
It went into limp mode, limiting rpm to 2k. If no codes, I wouldn't worry too much, it's common on many vehicles to get limp mode for no reason...

Thanks for that, as it reverted to normal afterwards I hoped that would be the reply. Much appreciated. 😁

Davipon

Discussion Starter · #4 · 26 d ago

landmannnn said:
It went into limp mode, limiting rpm to 2k. If no codes, I wouldn't worry too much, it's common on many vehicles to get limp mode for no reason...

Evening. This has happened a couple of times again. Seems OK after stopping for a little while and restarting. There's been mention here about the suction control valve(?), is this a likely culprit?
Cheers

landmannnn

· #5 · 26 d ago

Davipon said:
Evening. This has happened a couple of times again. Seems OK after stopping for a little while and restarting. There's been mention here about the suction control valve(?), is this a likely culprit?
Cheers

The scv normally shows up as stalling at idle, so probably not.

Have you got a code reader? There might be some pending codes.

If not a Bluetooth OBD dongle is around a tenner which you can pair with your Android phone (iPhone needs a WiFi OBD dongle).

Davipon

Discussion Starter · #6 · 25 d ago

Thanks for that, I haven't used one before so something like this?
Streetwize Diagnostic Tool956/6442
Cheers

Davipon

Discussion Starter · #7 · 25 d ago

landmannnn said:
The scv normally shows up as stalling at idle, so probably not.

Have you got a code reader? There might be some pending codes.

If not a Bluetooth OBD dongle is around a tenner which you can pair with your Android phone (iPhone needs a WiFi OBD dongle).

Reread your post and found this instead, will give it a go. Ta.

https://www.amazon.co.uk/dp/B07CP632CL?tag=track-ect-uk-390541-21&linkCode=osi&th=1&psc=1&ascsubtag=ecSEP4g0ml4djlh7u0jus

landmannnn

· #8 · 25 d ago

Yep, of you have an android phone it will work fine with an app such as torque.

Reactions: 1

Davipon

Discussion Starter · #9 · 17 d ago

Looks like the turbo charger boost sensor so ordered one from Milner off road. Will see what happens. Cheers for advice.

Davipon

Discussion Starter · #10 · 11 d ago

Update.
Replaced the engine intercooler boost pressure sensor which is on the top left of intercooler just visible behind upper grill. Accessed by taking grill off, straightforward enough, pop out studs on top, lean behind and push tabs forward, need stubby flat screwdriver for middle lower tab.
Pull off connector.
10mm bolts on top of sensor.
Hard bit is getting hand behind to pull vacuum tube from intercooler, tiny hands needed, even harder bit is getting it back on once sensor fitted to other end. It's not long enough to do it by just pulling tube off sensor.
Grill back on and done.
Drove brilliantly for 160 mile round trip today.

landmannnn

· #11 · 11 d ago

Nice one, thanks for coming back...

Davipon

Discussion Starter · #12 · 11 d ago (Edited)

Well......short lived joy🙄.
Started well this morning, started to play up a bit losing medium acceleration and kickdown. Would rev high If taken out of gear around 40mh and accelerator pushed and would behave slightly better after but then after about 60 miles went into limp mode but no dash light this time.
Stopped engine for 10 seconds and all as should be..
Will try and work out which app to use and how to use the code reader I bought. My auto electrician read the code previously.

Davipon

Discussion Starter · #13 · 10 d ago

Advice please.

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landmannnn

· #14 · 10 d ago

So having replaced the boost sensor it seems like you are getting too much turbo boost.

A few reasons this could be happening..

The vehicle has been remapped or a tuning chip added.

The variable vanes in the turbo have become partially jammed. If you take the the intake pipe off the turbo you can feel if they are free to wiggle.

A bad connection on the electronic actuator on the turbo (mechanical or electrical)

The electronic actuator is failing and needs replacing. (£170 reconditioned)

Somebody on here found a loose battery connection was at fault.

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Davipon

Discussion Starter · #15 · 9 d ago

Thanks landmannnn.
A couple of Qs. Attached is from Milner off road. I replaced the sensor marked 2.
Would any others be a source?
Will try to look at turbo later but not sure where or what on this engine. Never worked on one before. Will also try a turbo cleaner if that's likely to help.
Any info gratefully received.
Cheers

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landmannnn

· #16 · 9 d ago

There's just one boost sensor on yours.

Reactions: 1

Davipon

Discussion Starter · #17 · 7 d ago (Edited)

Following an ok run this morning in heavy traffic truck started to play up on return journey after a bit. Lost acceleration so pulled over and stopped engine for ten seconds, started fine had a bit of lag though with turbo and was able to accelerate. Then engine light came on and lost most acceleration again.
Checked the reader I have plugged in.
Came up with 102b.
Any thoughts? Now getting a bit wary of logish runs.

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Davipon

Discussion Starter · #18 · 7 d ago

Also found this. Is this from the factory?

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Davipon

Discussion Starter · #19 · 7 d ago

2

Looks like the orange and white lead has been joined with a crimp. Also looks like the thicker orange wire has a screen wire not used.
I wonder if the loose hose in the second pic is part of the problem with loss of power and codes.
Have repositioned hose and done clip up.

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landmannnn

· #20 · 7 d ago

It looks like you might have found the source of the problem. I can't even guess what and why somebody did that bodging.

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