Author Topic: Intermittent lack of Turbo Boost / P0299 OBD  (Read 262 times)

0 Members and 1 Guest are viewing this topic.

Offline Jonnyp62

  • S Class
  • *
  • Posts: 3
  • Gender: Male
  • Colour: Black Mica (16W) Metallic
  • Engine: 2.2L
  • Fuel: Diesel
  • Transmission: Manual
  • Trim: Sport
  • Year: 2009
Intermittent lack of Turbo Boost / P0299 OBD
« on: June 05, 2018, 08:38:34 am »
Firstly, if this issue has been addressed and answered before, I apologise but I can't find an answer..

Brief History...
I have a Mazda 6 2009 2.2 Sport MZR CD. There were some DPF issues at the outset (3 years ago) which my local garage addressed but they identified a lack of turbo power and with the EML light on from time to time they suggested I go to Mazda for a full diagnostic, After various failed efforts to rectify they concluded that the turbo boost wasn't working and, as an integral part of the turbo, the whole thing needed replacing . 
Not being happy with a £2.5k quote I went back to my local garage who fitted a recon unit.

Where I am now...
All appears ok until I am driving at motorway type speed and try and maintain speed or accelerate whilst going up an incline. There is a minor (but noticeable) stutter, the EML light comes on and I am immediately short on power.  The car remains in that state for a couple of days, during which time I am having to change down a gear when I wouldn't normally and there's not enough power in 5th to get nme up a hill which normallay would be a breeze.  I also get the impression that the engine sounds a bit more "diesel" than usual.

After a couple of days the light goes off and power is restored... until the next time.

My local garage who fitted the turbo suggested were unsure and suggested a referral back to Mazda as their diagnostics are better but, depite various visits, I'm not getting any useful information or suggestions, just a shrug of the shoulders. 

I describe the issue as something in the car thinking "Hmm there's a bit of effort required here, lets shut down part of the turbo and see if it goes away" 

Can anyone suggest a likely cause that can be investigated without too much expense by my local garage (I have no faith in the Mazda dealer)

Thanks

Offline apav

  • Sport Class
  • ****
  • Posts: 240
  • Gender: Male
  • Engine: 2.0L
  • Fuel: Diesel
  • Transmission: Manual
  • Trim: TS2
  • Year: 2009
Re: Intermittent lack of Turbo Boost / P0299 OBD
« Reply #1 on: June 06, 2018, 08:39:43 pm »
The dealer should be able to give you an answer for the EML light if the small garage cannot read it. If you do not want to return to the dealer, try a turbo specialist but before you take the car in, you should discuss with them and if they know what they are talking about, take it for inspection. If they are like, bring it here, we will find what it is, don't hold your breath if they try to sell you another reconditioned turbo or try to repair yours.

If it was just a mechanical turbo failure, you should not get the EML light. But because the turbo is electronically controlled, something fails in that way and you get the light on. Maybe you need to take apart the sensors and find out whether the contacts are fine. Something like should be an easy fix for the turbo specialist. There is a valve that controls the turbo boost. Maybe if that is not reading properly, the light comes on.

Offline Jonnyp62

  • S Class
  • *
  • Posts: 3
  • Gender: Male
  • Colour: Black Mica (16W) Metallic
  • Engine: 2.2L
  • Fuel: Diesel
  • Transmission: Manual
  • Trim: Sport
  • Year: 2009
Re: Intermittent lack of Turbo Boost / P0299 OBD
« Reply #2 on: June 08, 2018, 08:20:05 am »
Thanks for this... sorry for delay in doing so but I thought I might get an email notification of a reply.
It's not so much that I don't want the main dealer help but they have basically said they don't know what's causing it. I have been back to them on 3 occasions since it started an each time they tell me what the diagnostics say without coming up with any possible solution.
I'm in Cardiff and the main dealer is Victoria Park Mazda and my "local" garage is SVS. SVS are willing to help but don't want to charge me for trial and error work, hence the suggestion that I go back to Mazda for a solution.
The post here was not to find a "definitive" answer but to get some pointers as to potential issues that can be investigated.
Finding a "turbo specialist" is the next step I guess. Google searches don't seem to come up with anything so it may be a case of ringing around, explain the issue and see who sounds confident.



Offline Willpower

  • Administrator
  • Takuya Class
  • *
  • Posts: 775
  • Gender: Male
  • Watching events
  • Engine: 2.0L
  • Fuel: Petrol
  • Transmission: Manual
  • Trim: Sport
  • Year: 2004
Re: Intermittent lack of Turbo Boost / P0299 OBD
« Reply #3 on: June 08, 2018, 08:44:52 am »
In order to receive a notification of a reply to your topic you need to click the 'Notify' button at the top of the page while viewing a topic to receive notifications from that specific topic.
Look at life through the windscreen, not the rearview mirror.

Offline apav

  • Sport Class
  • ****
  • Posts: 240
  • Gender: Male
  • Engine: 2.0L
  • Fuel: Diesel
  • Transmission: Manual
  • Trim: TS2
  • Year: 2009
Re: Intermittent lack of Turbo Boost / P0299 OBD
« Reply #4 on: June 09, 2018, 06:16:12 am »
Check this:

http://www.qualityturbos.co.uk/cardiff-turbos-cardiff-turbochargers-50-w.asp

It says free turbo diagnostic service.

And this one:

https://www.autofixerpros.co.uk/turbo-repairs-cardiff.html

It says turbo is not boosting.

Maybe if you call them, they can guide you.

Offline Jonnyp62

  • S Class
  • *
  • Posts: 3
  • Gender: Male
  • Colour: Black Mica (16W) Metallic
  • Engine: 2.2L
  • Fuel: Diesel
  • Transmission: Manual
  • Trim: Sport
  • Year: 2009
Re: Intermittent lack of Turbo Boost / P0299 OBD
« Reply #5 on: June 11, 2018, 07:53:29 am »
Thanks

Found the first one on Friday but couldn't get an answer on the phone... will try again today
(I suspect they may have supplied the recon turbo that was fitted last year)