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Old 05-29-2012, 11:19 AM   #1 (permalink)
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Default Power issues (2 litre sakata 2006)

Hello, i was wondering whether anyone can help me.

Basically whilst driving, when putting your foot flat to the floor the car pulls nicely from idle to around 2.5k rpm, then it seems to just go flat. This is especially annoying on hill climbs at higher speeds as there is just no oomph. The turbo sounds as its spinning, but at around 2.5k revs it makes a slight hissing sound.

Is there anybody who can possibly shed some light on this and help me please.

Many thanks.
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Old 05-29-2012, 02:54 PM   #2 (permalink)
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If you could provide a little more info that would be helpful:

-how long has this been going on?
-any check engine lights?
-how many miles on the car?

etc...

Thanks
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Old 05-29-2012, 06:16 PM   #3 (permalink)
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It has happened ever since last week, last Wednesday to be exact. No lights are illuminated on the dash which is why i was concerned. The car has done 140,000 miles.
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Old 05-30-2012, 01:25 PM   #4 (permalink)
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You have the 2 liter turbo diesel correct? I can only make an assessment based on my last experience with a factory turbo motor (VW 1.8t), but that hissing sounds reminds me of one of the many vacuum and boost line issues I had with the car...although I am surprised you have no check engine light.

Does the car stumble at 2.5k or literally just stop revving past that point?

Also, the motor is completely stock right?
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Old 05-31-2012, 05:06 PM   #5 (permalink)
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..sounds like a air leak.. A vacuum hose, intake leak (intercooler/intake hose/gasket etc..)
, turbo pressure regulator, loose hose clamps, exhaust leak.?..
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Old 12-06-2012, 04:51 PM   #6 (permalink)
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Same problem here. 2006 Mazda 6 2.0 Diesel. Hissing noise over 3K RPM, car is slow to accelerate and struggles going uphill on a motorway.
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Old 12-07-2012, 04:28 AM   #7 (permalink)
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You might well have a partly blocked DPF, this would restrict the gas flow and kill the engine performace, the hissing might be from excessive back pressure because of that, if your local garage has the correct software they can do a manual regen and reset the sytem after. I would first rule out the simple things like vac leaks (worth checking the 2 pipes on top of the air box as they've been know to break), if the fuel filter has'nt been changed for a while i'd do that as due course, along with cleaning the EGR valve.

Dave
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Old 12-07-2012, 05:47 AM   #8 (permalink)
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Thanks Dave.

No DPF light or engine warning light on the dashboard.
Took it to the garage this morning, will see if they can figure it out. If not will probably buy Haynes manual and take a look myself tomorrow morning.

Will report back.
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Old 12-07-2012, 08:12 AM   #9 (permalink)
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You don't get a DPF or check engine light if the DPF is partly blocked! the car will just keep doing regens more often to clear it,when it's completely full you'll get a DPF light. one other thing to check is a cracked intercooler pipe or intercooler.

Dave
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Old 12-07-2012, 09:18 AM   #10 (permalink)
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Just been told by my garage that DPF and catalytic converter (same unit apparently) need to be replaced as they are too blocked. I asked if they can be cleaned out and was told that replacement is the only solution.

Will update later
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