Skoda Yeti 2011 rough running, lack of power and smoke

Ask for and share advice on using the PicoScope kit to fix vehicles here.
Post Reply
bmtech
Newbie
Posts: 1
Joined: Tue Apr 09, 2019 5:05 am

Skoda Yeti 2011 rough running, lack of power and smoke

Post by bmtech »

Hello...
Need help from experts here.
Car came in with plugged up DPF with heavy carbon deposits in the exhaust and turbo. Trouble codes were - P0299, P046C,P0121, 7934,P00AF. Before coming to my garage, the HP pump and injector units were serviced by another garage.
Complete exhaust cleaned and DPF decarbed, Turbo serviced, Cyl head reconditioned, and commissioned the engine. Spewed lot of carbon out initially and cleared. But engine still runs on low power, smoke. Test driven for more than 30kms. No trouble codes!
Boost actuator working, MAF responding well.
Scoped injectors at idle and 2500 rpm. Did not like them. Kindly have a look and share what you think.
Thanks.
Attachments
__20190409-0001 cyl 3 2500.psdata
(1.22 MiB) Downloaded 440 times
__20190409-0001 cyl 2 idle.psdata
(1.26 MiB) Downloaded 437 times
__20190409-0001 cyl 2 idle 3.psdata
(1.23 MiB) Downloaded 405 times
__20190409-0001 cyl 2 idle 2.psdata
(1.23 MiB) Downloaded 409 times
__20190409-0001 cyl 2 2500.psdata
(1.27 MiB) Downloaded 401 times
__20190409-0001 4 cyl idle2.psdata
(1.38 MiB) Downloaded 413 times
20190409-0001 cyl1 idle.psdata
(1.22 MiB) Downloaded 426 times
20190409-0001 cyl1 idle 2.psdata
(1.24 MiB) Downloaded 398 times
20190409-0001 cyl 1 2500.psdata
(1.25 MiB) Downloaded 438 times
__20190409-0001cyl 4 idle.psdata
(1.26 MiB) Downloaded 396 times
__20190409-0001 cyl4 idle3.psdata
(1.2 MiB) Downloaded 402 times
__20190409-0001 cyl 2500.psdata
(1.25 MiB) Downloaded 394 times
__20190409-0001 cyl 4 2500.psdata
(1.28 MiB) Downloaded 420 times
__20190409-0001 cyl 3 idle.psdata
(1.22 MiB) Downloaded 400 times
__20190409-0001 cyl 3 2500.psdata
(1.22 MiB) Downloaded 427 times
__20190409-0001 cyl 2 idle.psdata
(1.26 MiB) Downloaded 417 times
__20190409-0001 cyl 2 idle 3.psdata
(1.23 MiB) Downloaded 428 times
__20190409-0001 cyl 2 idle 2.psdata
(1.23 MiB) Downloaded 381 times
__20190409-0001 cyl 2 2500.psdata
(1.27 MiB) Downloaded 387 times
__20190409-0001 4 cyl idle2.psdata
(1.38 MiB) Downloaded 366 times

KimAndersen
TwoWaves
TwoWaves
Posts: 246
Joined: Fri Nov 30, 2012 2:53 pm
Location: Denmark

Re: Skoda Yeti 2011 rough running, lack of power and smoke

Post by KimAndersen »

Hi.

Is it black smoke coming from the tailpipe ! If that's the case I would be looking at the MAF sensor and this is despite your comment.

You should check the specified vs actual values from the maf sensor it could be reading a high MAF value.

The diesel particle filter is cleaned and my first thought was if the ash level should be reset or not. I know when the DPF is changed for new, it should be reset !!!.

Regards
Kim

seafordmotors
OneWave
OneWave
Posts: 17
Joined: Mon May 08, 2017 1:26 am

Re: Skoda Yeti 2011 rough running, lack of power and smoke

Post by seafordmotors »

Hi,
Firstly if yoy have black smoke coming out of any diesel equipped with a DPF or the tailipe is black than you
the DPF is damaged and needs to be replaced. No cleaning will restore a damaged DPF.

Also look at the boost control and EGR operation.

Post Reply