Mazda CX-5 Forums
Technical Section => Engine/Transmission/Powertrain/Exhaust => Topic started by: SteveAWD on January 26, 2023, 04:06:22 pm
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Hi all I've just bought a 2012 CX5 Sport Nav D AWD 2.2 with 84000 miles.
I'm pretty please with the car as its in really good condition but the drive is a bit jerky at low revs. It pulls away ok, and then takes off with start. Its as if there's a bit of a flat spot at the lower rev range.
I'm hoping it just needs a really thorough service . There's nothing showing on the dash and the engine sounds really quiet for a diesel. Any opinion most welcome.
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Might be first stage turbo fault, lots of post about it on here.
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Thanks Hovis, yes, I was thinking the same but I really aught to check a few things out before I pull the turbos off the engine.
I'd really like to know where the turbo change-over valve is as that would be a start.
Is there a decent workshop manual available for the CX5? Probably going to need one if its the turbo.
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https://www.mcx5.org/mazda_cx_5_service_repair_manual-197.html
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Thanks for that Hovis but I can't get it to download on my laptop running windows 10. Perhaps it doesn't like it!
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there is a facebook page mazda cx-5 owners club uk, lots of posts on there about turbo's
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I'm learning a bit about how this turbo works.
There's a few vacuum switches mounted on the back of the engine that are piped up to the various cans on the turbo to open and close the valves at the correct time. There is also a vacuum pump mounted somewhere on the engine. I'm assuming this pump supplies the vacuum to these switches on the back of the engine and really, if that pump isn't supplying enough vacuum, the turbo would malfunction?
I'll have to do some more research on this but it looks like I may need this pump.
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The car has now gone back to the dealer we bought it from and they are fitting a new turbo at this moment. They started it the day before yesterday and the guy said I would get it back the next day but I think he's dreaming! We're now on the third day and I know from experience that a turbo job can be a nightmare on some vehicles where most of it is hidden down the rear of the engine.
When it returns I''m thinking of performing some major servicing that dealers don't tend to do. Namely, drop the sump to change the oil pickup and to have a look at the cams to see what condition they are in., plus new injector seals on the re-fit.
Hopefully, provided its not ever had the "low oil pressure" saga, it'll be fine.
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Bit of an update to our 2013 2.2 skyactive CX5. Auto AWD
New turbo has been fitted plus a de-coke and DPF regen.
The car now performs more or less as it should apart for just a couple of things which I'm hoping, with some advice from people on here, will tell me what to look for.
Turning the engine on (from cold) it runs on tick-over fine but as soon as drive is selected (its an auto) the tick-over is not good at all. It misses a beat on a regular basis. Take it out of drive and the tick-over returns to normal. This missing goes away when the engine gets up to temperature.
The second thing is that although there's no smoke from the exhaust, it smells of diesel fumes and in the 300 miles or so we have covered since the de-coke I've not seen more than 32mpg on the dash display. The mechanic who did the de-coke said "they all smell like that" but my 3.0d XF doesn't at all. Also, does anyone know where the engine block breather is situated as that was the next check I was going to do if I can find it!
Any input on these problems would be most welcome as I've checked most things but I can't track the problem down as yet. Thanks.