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Mazda 3 / Re: Note to new buyers of old 2's and 3's....beware underbody rust!!
« Last post by aytch on December 12, 2018, 01:37:35 PM »
Hi and I very much appreciate your reply / advice...thank you!!
As I won't be able to do the job myself would asking the garage to wire brush / tidy up and apply Waxoyl alone be a solution?
If so, how often should the process be repeated?
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Mazda 3 / Re: Note to new buyers of old 2's and 3's....beware underbody rust!!
« Last post by Willpower on December 12, 2018, 09:52:19 AM »
The choice you make is obviously personal and in accordance with your foreseeable fortunes.

However I must point out that  wire brushing and covering with underseal is not going to stop the rust.  In fact it could make matters worse.  Covering rust with an impermeable coating (underseal) only gives the rust progression one way to go and that is inwards and deeper into the available metal.  This of course would then be unseen under the underseal and would eventually result in catastrophic failure later on.
 
As the rust has already taken hold, there are proprietary products that will chemically alter the rusted metal and help to prevent further contamination. 
So my advice would be a 3 step process.

1)  Wirebrush. Even to the extant of using a power tool with suitable attachments. However caution is required that you do no worse damage to the surrounding area.
2)  Use a proprietary product such as Kurust       https://www.hammerite.co.uk/product/kurust/     to coat the affected area.
3)  Cover the entire underbody with a suitable underseal product.   such as     https://www.halfords.com/motoring/paints-body-repair/rust-removal-treatment/hammerite-underbody-seal-500ml

Hope this helps
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Vehicle Electrics / Re: iStop
« Last post by Tall333 on December 11, 2018, 04:50:00 PM »
Hi to all, enjoying being the owner of a 2015 Mazda 3.
Can you tell me, does the iStop only start working when the engine is at full temperature ?

Should there be an indicator light on the iStop switch.
As per StevenRB45's advice, there are parameters to be met.  If you select the maintenance screen on the infotainment, then fuel economy monitor, one of these 3 screens shows icons with halos around them for engine, battery, and air con.  You might need to hide the banner at the screen bottom to see them.  All halos must be there for "ready" to be displayed, and for istop to work.

The engine needs to be not cold and battery charged.  Setting the heater to screen stops it from working, as does being stopped with the steering wheel slightly turned or being stopped (and holding it using the footbrake) but only pressing the footbrake lightly.

There's no indicator light on the switch, but if you hold the switch for a couple of secs it'll turn istop off, it'll beep and you get a yellow light on the dash.  Another long press turns it back on.
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Mazda 3 / Re: Note to new buyers of old 2's and 3's....beware underbody rust!!
« Last post by aytch on December 11, 2018, 03:42:01 PM »
The update:
Took the car back to the sales garage today and got it on a ramp. Bear in mind there were conflicting points at the start - the "excessive rust" comments of my service mechanic and the MOT tester, yet there was no MOT advisory mentioning problematic rust.
Also bear in mind I'm no car mechanic but do have some basic common sense experience of rust in the past.
Once under the car it is plain to see the back end (suspension arms?) are rusty and beginning to flake a small amount on their "trailing edges". To my untrained eye the rest of the underside of the car would appear to have no more rust than one might expect under a car now 8.75 years old, which was also todays opinion of the sales garage guy, so I am thinking of going for the cheapest solution at present - to have the underneath wire brushed etc and an underseal applied early in the new year by the sales garage.
If I sell the car I won't get more than 3.5K for it and, in the original words of my service mechanic and the MOT guy, as it currently stands, the car should be ok for at least 1 to 2 years anyway. If the underseal can then slow the rust progression further for an extra couple of years, that is all I can probably expect given the age of the car.
Allowing for the fact I can only afford to add a couple of thou max to any part-exchange price offered to me, it would seem the underseal route would be the cheapest option for the next 3-5 years motoring.
I don't know if others would come to the same decision....? Which type of underseal might be best? Please let me know!!
(My 14 y/o MX5 is rust free and currently has waxoyl applied...but then it only has "fair weather" use and is kept under cover the rest of the time)
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Vehicle Electrics / Re: iStop
« Last post by StevenRB45 on December 11, 2018, 01:27:09 PM »
Not massively well versed in the i-stop system as used by Mazda but general principles would apply. Most systems have a surprisingly large number of parameters they look at when deciding if to operate stop start (e.g. the Citroen stop/start has 60!).

Coolant temp is most likely one of them.. along with battery charge/condition, current electrical load and the more obvious ones.

You then get to less obvious things..stuff like is the cabin temperature within 2 degrees of the selected temperature on the climate control? as an example don't know if Mazda uses that one..but Citroen do. If I remember correctly the gen 3 has an Istop display in the centre screen that tells you current system status at the bottom of the fuel economy monitor.

Don't know about the indicator light but plenty of gen 3 owners about sure one of those can confirm.
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Mazda 3 / MOVED: iStop
« Last post by Willpower on December 10, 2018, 10:52:29 PM »
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Vehicle Electrics / iStop
« Last post by sjpoole on December 10, 2018, 02:51:44 PM »
Hi to all, enjoying being the owner of a 2015 Mazda 3.
Can you tell me, does the iStop only start working when the engine is at full temperature ?

Should there be an indicator light on the iStop switch.

Many thanks................Steve
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Maintenance / Re: Maintenance
« Last post by ryan34 on December 10, 2018, 10:16:50 AM »
Thanks for your input. I do the occasional long drives at least once month but mostly it’s just driving to work. Now that I think about it, most likely I will stick to dealership unless they don’t do well then I’ll look around for dealerships close to me. Does our skyactiv petrol has problems with carbon deposits?
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