Author Topic: Mazda 3 Speedometer Query  (Read 1694 times)

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Offline k_orbz

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Mazda 3 Speedometer Query
« on: December 22, 2017, 10:05:38 PM »
Hi guys I am new here.. and a new driver.

Btw, I have a Mazda 3 2008 1.6engine Saloon. I have noticed that my speedo doesn't start moving until I hit nearly 20mph and my tachometer automatically goes up to 1 upon engine start without stepping on gas. Since this is my first car and want to keep it for the next 2 years I want to get some advice, do I need to get it recalibrated or is this normal? My driving instructor's car shows quite a lot of difference on how its meters work than my car although his car is a 2016 peugot 308. I just really need some advice before going to a mechanic and have it looked. Thanks.

Offline StevenRB45

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Re: Mazda 3 Speedometer Query
« Reply #1 on: December 23, 2017, 08:05:03 AM »
PSA cars do that "sweep" where they move the needles through their full range before settling, Mazda does not.

The tachometer is measuring engine speed, 1000rpm at cold idle is about right, on a really cold day it might be higher, once the engine is warm it'll be about 650-750.

I can't remember what the minimum calibrated speed is on my (2011) car think it reads down to 5 mph but someone else with a Gen 1 may be able to help as mines a later model. My feeling would be unless it's moving erratically it'll be fine.

Offline moozmooz

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Re: Mazda 3 Speedometer Query
« Reply #2 on: December 23, 2017, 10:31:28 AM »
Your speedometer should register at all speeds, so should move smoothly off the zero stop as soon as you start moving. If you've recently bought the car and it's got any sort of warranty, I'd be having a word with the seller.

Offline Willpower

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Re: Mazda 3 Speedometer Query
« Reply #3 on: December 23, 2017, 05:46:42 PM »
Your tachometer is behaving normally. No worries there. Regarding your speedo.  I checked mine this afternoon (Gen1 2004)  The needle moves the instant I start moving.  So if yours is not, then there is definitely a problem.
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Offline k_orbz

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Re: Mazda 3 Speedometer Query
« Reply #4 on: December 24, 2017, 09:13:57 AM »
Ok thanks. Any1 here know how much approx a recalibration costs?

Offline StevenRB45

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Re: Mazda 3 Speedometer Query
« Reply #5 on: December 24, 2017, 10:44:52 AM »
It wouldn't be a recalibration, there is a speed sensor bolted onto the outside of the gearbox. It sends the signal to the dial, it would likely be that needs replaced. It's not an expensive part, 10 to 15 quid for the bit off eBay, plus fitting, which shouldn't be too bad as it sits on top of the gear box and reasonably accessible.

You downloaded a GPS speedo app to see if it's reading correctly otherwise? Speedos aren't dead on but it should read a max of 10% over the actual speedo but never under.
« Last Edit: December 24, 2017, 10:47:50 AM by StevenRB45 »

Offline k_orbz

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Re: Mazda 3 Speedometer Query
« Reply #6 on: December 25, 2017, 09:05:22 AM »
It wouldn't be a recalibration, there is a speed sensor bolted onto the outside of the gearbox. It sends the signal to the dial, it would likely be that needs replaced. It's not an expensive part, 10 to 15 quid for the bit off eBay, plus fitting, which shouldn't be too bad as it sits on top of the gear box and reasonably accessible.

You downloaded a GPS speedo app to see if it's reading correctly otherwise? Speedos aren't dead on but it should read a max of 10% over the actual speedo but never under.

Hi thanks, what I noticed is that the speedo moves normally when driving at road normal speeds 15mph ish and above but at low speed it just more or less sits at zero which I find really strange and since this is my first car, I just want to be sure that it is actually telling me the right speed and wont get in trouble later on. But I think I would try observing it for a bit maybe a month or two then I'll go from there.

Thanks guys and Merry Christmas.

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Re: Mazda 3 Speedometer Query
« Reply #6 on: December 25, 2017, 09:05:22 AM »