Mazda 3 Engine Problems
Mazda 3 2004: Fuel pump failure
Fuel pumps are a relatively common failure across many makes and models, but two in a year does seem too much. They shouldn't leak when they fail as they're in the fuel tank. Regularly running low on fuel can cause the pump to overheat and fail, it can also stir up any sediment that's on the bottom of the tank and could cause a blockage. You can try approaching Mazda, but I doubt you will have any success, as your car is 12 years old.
How does the Peugeot 308 compare to the Mazda 3?
They're quite different vehicles, the Peugeot is a roomy, comfortable, safe and pleasant wagon, and boasts 4.0 L/100km economy. The Mazda SP25 is a sedan or hatch, and a sportier drive with a firmer ride, and the 2.5-litre petrol engine offers an average of 6.0L/100km. If you're trying to choose which one to buy it comes down to what you want from your car, comfort and economy, or a sporty drive. Another thing to consider is maintenance costs and the Mazda scores there.
Problems with Mazda i-stop?
I have seen reports of the system not working as expected, but no real explanations yet. It could simply be that people are not up to speed on the system, and what parameters it uses to activate. It doesn't necessarily operate in every situation, and the engine can restart if, for instance, you slightly release the brakes or turn the steering wheel.
Mazda 3 start/stop savings
Thanks for the feedback. All systems are different and a Golf kills the engine every time you come to a full halt.
Mazda 3 start/stop
Mazda 3: Excessive fuel consumption
When doing your research you need to dig deeper and find out the claimed fuel consumption for city and country driving. The Mazda 3 manual is claimed to return on average 7.9 L/100 km, but when you look at the claims for city and country you find that it does 10.8 L/100 km and 6.2 L/100 km respectively, which lines up reasonably well with your experience remembering that the claimed figures are not real life ones like your own are.
Mazda 3: High idle speed
You need to measure the idle speed and compare it to the idle speed spec. You can do that using a tachometer. You can check the fuel economy over a tank full of fuel and compare it to what you should expect. Mazda's official claim for the Neo was 8.9 L/100 km and I would expect your car to be around that mark.
Does start/stop wear out the engine?
The feature is only really effective in heavy stop-start traffic where you can save fuel by not idling the engine while you're stopped. If the traffic isn't stopping and starting regularly the system doesn't have much impact on the economy. I would expect carmakers to beef up the starting system to ensure the more frequent use of components like starter motors doesn't lead to their premature demise. I would also expect them to have thoroughly durability tested cars with the feature to ensure there are no hidden issues of the sort you raise. On the cars and trucks I have driven with the feature I have always been concerned about the restarting when you need to move off, and you would want any delay to be minimal. The "gung-ho racing driver" behind you has the responsibility to avoid running into you, but I understand your concern.
Mazda 3 2008: LPG surging
Our LPG industry specialist says there is no reason that the normal Mazda scheduled maintenance of your car can't be carried out by a regular dealership mechanic. The only time an accredited LPG technician is required is when the high-pressure side of the gas system is to be opened for some reason. The dealer's behaviour is strange given that they are normally quite happy to sublet the LPG work to an accredited LPG business. Your vehicle would have been fitted with an AAFRB compliance plate when the system was installed, and the very presence of that plate is confirmation that the system on your car has been approved. If you are concerned about its approval check for the plate or you could contact the AAFRB at http:// www.aafrb.com.au to seek advice.
Mazda 3 2006: Loud noise when cold
Normally I would suspect the valve lifters based on your description of the noise, but I would have another mechanic listen to it and diagnose it for you.