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New Members / Re: REDEX Fuel additive for SKYACTIV-G
« Last post by Engineer Andy on November 23, 2020, 12:59:04 PM »
It'll make much less of a difference (presumably the fuel injector cleaner) on the direct injection SA-G engines in gen-3 cars and newer than for the port-injected gen-1 and 2 cars. The fuel + cleaner would help clean the inlet valves, but will barely do so on the newer cars.

I'm sure it'll make some difference to the injectors on the new ones, but only those cars doing predominantly short trips from cold on a rich mixture where deposits of unburnt fuel/carbon may build up.

I buy a 4-dose (500ml) bottle every couple of years on my gen-1 1.6 petrol car when they are on offer at Halfords (normal price about £8-10, offer about £5 last time), using 2 doses over the next two fill-ups, then repeating 6 months later.  Seems to do the trick for mine.

Even without the offer, it's still far cheaper than using branded superunleaded fuel (which apparently has extra cleaning additives over both normal supermarket unleaded and super), which is about £6 a tank more expensive for a similar effect as one dose.

Cars will get more of a benefit from the higher octane rating through better mpg (even if the injectors are relatively clean anyway) or performance, but only to a few percentage points - mine achieved about 2-3 better mpg, but obviously only when I was using that fuel.  Cars with clogged injectors will get similar better running once the blockages are removed.

I'm not so convinced about car manufacturers' own brand of things like this.  Unlike 'brand name' items like Redex or consumable parts, like windscreen wipers, Mazda won't give discounts, but will likely be similar to brand name ones - like Bosch wiper blades, which I can source on either ebay or Amazon for nearly half the price Mazda of (incidentally) Halfords (who rarely discount on that item) would.

Unfortunately the way direct injection engines work, they are more likely to get gunk on the inlet valves than older, port injected cars.  It doesn't appear to be a huge issue on Mazdas as few have reported knock-on problems such as apprecably reduced mpg or rough running - and probably only those doing the type of usage pattern I described above.

If you do a decent amount of longer journeys where the car has time to warm up and run at decent speeds, then I'd only give it a dose or two or Redex or similar every few years.  Badly affected cars can apparently have soem walnut blasting treatment to remove caked on residues in addition to having the injectors cleaned/replaced as necessary.  I've yet to hear of anyone here who's car has needed that level of cleaning though.
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Maintenance / Re: Lumpy / erratic idle
« Last post by PJW17 on November 23, 2020, 09:45:21 AM »
My car (11 plate Takuya, so 1.6 petrol) has had this problem recently, and it was worse than just the gaskets going. My intake manifold had cracked somehow, so there was a leak from that. The garage couldn't trace an OEM manifold, so it's having a brand new part from Mazda fitted this week.

Like the poster above says, I hadn't exactly noticed a massive drop in performance or economy, but no doubt it'll be like driving a new car when it's sorted.

In terms of symptoms, my commute to work involves ten mins of town driving, 15 mins of motorway, then 5 mins town again. It was once I hit the first set of lights after coming off the motorway that my light would come on, and the idle revs go 'lumpy'.

With a run of town driving (working from home and just popping to the shops), the engine light would clear and all would be fine, but as soon as I hit those traffic lights after coming off the motorway, it'd ping on again
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Mazda 3 / Re: Mazda 3 skyactive x engine
« Last post by Willpower on November 20, 2020, 10:30:34 PM »
Is there any way to tell them apart of even (if ordering via either a main dealer or broker) to stipulate where you want it to be sourced from?

Only if you can get hold of the VIN number here is an example.



There are many websites that can give you the information, but only if you can supply the VIN

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New Members / REDEX Fuel additive for SKYACTIV-G
« Last post by john_severn on November 20, 2020, 05:25:26 PM »
Hi Everyone,

Wondering if there is any wisdom out there concerning Redex petrol additive and using it with SKYACTIVE-G 2.0 petrol engines.  Good idea or only use the very expensive Mazda fuel additive?

Cheers
John
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Mazda 3 / Re: Mazda 3 skyactive x engine
« Last post by Engineer Andy on November 20, 2020, 12:52:54 PM »
That doesn’t sound good new supercharger on rather new cars. Yes I was told by the service manager at local Mazda garage before it closed down that  a lot of the electric faults are from the cars from Thailand . He said it was ok when they were all made in Japan.

Does that mean that some gen-4 cars on the UK market are sourced from their Thailand factory and some from their Hiroshima plant in Japan?  Certain sub models from each or just a mix generally?  I would be far more inclined to buy a model made at a Japanese factory (as mine was) than Thailand, especially if those assembled there have most of the gremlins.  Is there any way to tell them apart of even (if ordering via either a main dealer or broker) to stipulate where you want it to be sourced from?

A few years ago when the gen3 car was being sold, I remember them having many such electrical and trim/build quality (e.g. wing mirrors falling off) issues with quite a few coming in for remedial work when mine was in for service.  Far less issues after a couple of years.
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Heating, AC & Ventilation / Re: Cabin blower motor - location/removal
« Last post by StevenRB45 on November 19, 2020, 10:26:39 PM »
It's the first big bill It's thrown up so I can't be too angry, it's not getting fixed until at least pay day but between lockdown and homeworking getting confirmed until April does rather feel a bit like a pointless extravagance currently.

I still have working aircon/heater and although the noise is annoying I'm in the car once or twice a week at weekends and it sits 5 days a week while I work.
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Heating, AC & Ventilation / Re: Cabin blower motor - location/removal
« Last post by red_imps_2003 on November 19, 2020, 09:30:48 PM »
I'm sorry to hear you are having fan problems and for passing on the price you were quoted. Gardners is certainly convenient to get to. Mercifully the fan noise cleared up after a few weeks. I've now got aircon to fix (suspect several hundred quid for that) and the timing belt is due for renewal, with being 11yrs old now. Anything costing 3-digit sums or more and I need a lie down and the assistance of a ventilator.
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Mazda 3 / Re: Mazda 3 skyactive x engine
« Last post by StevenRB45 on November 18, 2020, 11:40:12 AM »
It was a free repair and Mazda took the parts away to study, so you'd hope a revision/recall would be forth coming.

It wasn't a total failure either apparently, car ran normally but the supercharger emitted a noise.
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Mazda 3 / Re: Mazda 3 skyactive x engine
« Last post by speedy mazda on November 17, 2020, 10:49:40 PM »
That doesn’t sound good new supercharger on rather new cars. Yes I was told by the service manager at local Mazda garage before it closed down that  a lot of the electric faults are from the cars from Thailand . He said it was ok when they were all made in Japan.
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Mazda 3 / Re: Mazda 3 skyactive x engine
« Last post by StevenRB45 on November 17, 2020, 07:54:42 PM »
There's been a few on a the UK Facebook group needed a new supercharger.

To be fair generally the gen 4 has far more electrical than mechanical issues currently. Seems a lot of the new safety systems have teething issues.
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