I’m looking for technical help or recommendations on: Hot Starting Issue
I wonder if anyone has the same hot starting issue I am having with my 2019 ND2 and if so did they get a solution?
When the engine is fully warmed up, say after a long drive on the motorway, if I stop for 5 to 20 minutes and try to restart the engine with the stop/start button (e.g when having stopped at a garage for a refuel) the engine just judders violently for a second or so and stalls. A second press of the button usually effects a normal start. My intuition tells me that it could be heat soak from the engine affecting some component or setting causing the problem. Cold starts are fine. I did not have this problem on either of my two previous NDs (ND1 & ND2). I have had the DC/DC Converter replaced for other reasons but the problem has been evident before and after the installation. No fault code has ever been generated and the Mazda dealer says they would have to go through a very extensive sequence of investigations to determine the cause which could be very costly. Any suggestions for causes and possible solutions would therefore be gratefully received.
That suggests that they don’t have a clue and says everything about a lack of experienced mechanics. What happened to those brilliant blokes who could identify a problem just by hearing a description or listening to an engine!
This has only happened once to me and I didn’t think much of it at the time. It hasn’t repeated again either so I thought I did something wrong. (2.0 ND2 as well)
Yeh. I thought it was me at first. I thought that I was releasing the starter button too quickly but unlike the old fashioned ignition key switch starter which used to turn the starter motor for as long as you held the key in the “start” position, the starter button on the ND just starts a sequence of operations and holding the button in for longer makes no difference.
Thanks for your input Robbie, but no, I am not releasing the clutch pedal prematurely. If I was it would exhibit the fault all the time, I would have thought not just when hot and being stopped for a few minutes. Thanks for your input. If you have any other ideas they would be welcome. Cheers.
Another question that is not meant to offend. When you start the car do you tend to tickle the throttle?
On modern machinery it is always advisable to NOT touch the throttle during start up and let the engine ‘settle’ prior to applying any input.
The exception is, if you think that the engine is ‘flooded’ you can push the accelerator to the floor and hold it there while you crank the engine. It will not start and allows the fuel to be flushed from the combustion chambers. This feature can also be useful when you have done an oil and filter change and you want to build up some oil pressure prior to a full start up.
No offence taken Malc. No, I do not touch the throttle. I have dealt with flooded engines before after having maintained numerous cars from the days of SU/Stromberg and fixed jet carbs such as those fitted to Fords etc. As I said, I have had to NDs before this one an ND1 and an ND2 both 2.0 litre cars such as this one and neither exhibited this “trait”. I wouldn’t be too bothered but it creates quite a serious judder and knocking noise which can’t be doing the engine mounts and exhaust any good. Again thanks for taking the time to consider my issue.
Cheers.
It does feel as if the engine is starting backwards or just oscillating. It seems to me that something is getting hot and not working as it should with heat soak from the engine when there is no cooling air flow. I just wonder if there is something in the ignition timing system that maybe causing this. I wonder if swapping the coil packs and or spark plugs around may make a difference. I will give it a try.
Cheers.
Yes. When the battery is charged enough i-stop works fine. It never judders or stalls on i-stop. It only does it when the hot engine has been stopped for a few minutes and an attempt to restart it is made. This suggest that it is something happening as a result of heat soak.
I don’t think you can as it resets itself every time you start the engine. I think that you can only turn it off when the engine is running. In the past even when the engine is hot the i-Stop was not activating because of the problems I had with the DC/DC converter, yet I still had the hot start issue. I will check it out though. Thanks.
