Now I expect it is just me, but why does my engine sound different now the car has done 7500 miles? 

 

When I say sound different, what I mean is when driving at 55-60MPH the engine seems to sound slightly noisier than it did a while ago.. not real noisy, but sounds slightly louder as if it needs to change up gear, even though the revs are normal, around 1700-1800 rpm....

 

It has not just started it has been like it a while :(

 

Also, I think I know the answer to this, whilst sitting at the traffic lights STOP/START activated after a minute or so the engine started on its own, what would cause that? I am certain I did not lift my foot off the brake... so could it be the AC was needed to cool the car a bit inside? or maybe the battery needed a boost?

 

Stu 

Hullo,

On point one, i couldn't say I've never been fortunate enough to have such a young motor. But I'd imagine it's just bedding in.

On point 2 having driven fords/vauxhalls with stop/start this isn't unusual behaviour and I think it's to prevent battery drain

Lol... hate modern cars, those were the day's when I could take my old Ford Cortina to bits ... nothing fancy... 

 

That was what I thought (ref point 1) my old Exeo did seem to change sound... I did suspect it may be down to either the AC needing to work or the battery needed a boost... It does say in the manual that it can do this, but when it happens for the first time it takes you by surprise Lol

 

Also, I think I know the answer to this, whilst sitting at the traffic lights STOP/START activated after a minute or so the engine started on its own, what would cause that? I am certain I did not lift my foot off the brake... so could it be the AC was needed to cool the car a bit inside? or maybe the battery needed a boost?

 

Stu 

Battery is powerful enough. It`s the AC.

I have a feeling it could be the AC, although it is 18 degrees here and the AC is set to 18 then the inside would be slightly higher and it did go a little warmer inside just before it restarted... 

No.

When starstop system restarts on his own, the capacitor needs energy. The ac is anyway in a special mode when you stops.

This is absolutely normal behaviour.

From tapatalk

In 12 months it's the first time it has done this .. Lol just surprised me

 

So it was just the battery needing a boost...

In 12 months it's the first time it has done this .. Lol just surprised me

 

So it was just the battery needing a boost...

 

Mine 1.4 tsi has stop start and manual air con and I can confirm that the air con doesn't affect the stop start. When I was in Germany earlier this month with temps of 39 deg C when the stop start kicked in  (or off!!) the air con stopped cooling. I restarted by putting my clutch down to avoid cooking!

 

When I was sat in the ferry queue I also experienced the engine restarting itself after a while - presumably because of the DRL's being on .

The stop / start system is quite a complicated process with a varying number of influences...

 

Conditions for the automatic engine shut down (stop phase)

› The gearshift lever is in Neutral.

› The clutch pedal is not depressed.

› The driver has fastened the seat belt.

› The driver's door is closed.

› The bonnet is closed.

› The vehicle is at a standstill.

› The engine is at operating temperature.

› The charge state of the vehicle battery is sufficient.

› The stationary vehicle is not on a steep slope or a steep downhill section.

› The engine speed is less than 1200 1/min.

› The temperature of the vehicle battery is not too low or too high.

› There is sufficient pressure in the braking system.

› The difference between the outdoor- and the set temperature in the interior is

not too great.

› The vehicle speed since the last time the engine was switched off was greater

than 3 km/h.

› The front wheels are not turned excessively (the steering angle is less than 3/4

of a steering wheel revolution).

 

Conditions for an automatic restart (start phase)

› The clutch is depressed.

› The max./min. temperature is set.

› The Defrost function for the windshield is switched on.

› A high blower stage has been selected.

› The START STOP button is pressed.

 

Conditions for an automatic restart without driver intervention

› The vehicle moves at a speed of more than 3 km/h.

› The difference between the outdoor- and the set temperature in the interior is

too great.

› The charge state of the vehicle battery is not sufficient.

› There is insufficient pressure in the braking system.

Stuart, I have the same issues. Engine sounds louder but not bothered much by it, I assumed it was starting to loosen up. The engine does restart, I have noticed this when it is on a short journey, the power need to start the car from cold is, so I have been led to believe is quite high, plus lights on, heater on etc, the alternator kicks I power it all.

The stop / start system is quite a complicated process with a varying number of influences...

 

Conditions for the automatic engine shut down (stop phase)

› The gearshift lever is in Neutral.

› The clutch pedal is not depressed.

› The driver has fastened the seat belt.

› The driver's door is closed.

› The bonnet is closed.

› The vehicle is at a standstill.

› The engine is at operating temperature.

› The charge state of the vehicle battery is sufficient.

› The stationary vehicle is not on a steep slope or a steep downhill section.

› The engine speed is less than 1200 1/min.

› The temperature of the vehicle battery is not too low or too high.

› There is sufficient pressure in the braking system.

› The difference between the outdoor- and the set temperature in the interior is

not too great.

› The vehicle speed since the last time the engine was switched off was greater

than 3 km/h.

› The front wheels are not turned excessively (the steering angle is less than 3/4

of a steering wheel revolution).

 

Conditions for an automatic restart (start phase)

› The clutch is depressed.

› The max./min. temperature is set.

› The Defrost function for the windshield is switched on.

› A high blower stage has been selected.

› The START STOP button is pressed.

 

Conditions for an automatic restart without driver intervention

› The vehicle moves at a speed of more than 3 km/h.

› The difference between the outdoor- and the set temperature in the interior is

too great.

› The charge state of the vehicle battery is not sufficient.

› There is insufficient pressure in the braking system.

 

 

Great answer thanks,

 

My engine probably didn't re start when stood at lights on a very hot day as you don't set an interior temperature on manual air con

"› The difference between the outdoor- and the set temperature in the interior is too great."

 

When the car restarted after being sat in a very long ferry queue it was probably "the charge state of the vehicle battery is not sufficient" - The car had numerous restarts and had sat with the DRL on for some time (not LED)

The stop / start system is quite a complicated process with a varying number of influences...

 

Conditions for the automatic engine shut down (stop phase)

› The gearshift lever is in Neutral.

› The clutch pedal is not depressed.

› The driver has fastened the seat belt.

› The driver's door is closed.

› The bonnet is closed.

› The vehicle is at a standstill.

› The engine is at operating temperature.

› The charge state of the vehicle battery is sufficient.

› The stationary vehicle is not on a steep slope or a steep downhill section.

› The engine speed is less than 1200 1/min.

› The temperature of the vehicle battery is not too low or too high.

› There is sufficient pressure in the braking system.

› The difference between the outdoor- and the set temperature in the interior is

not too great.

› The vehicle speed since the last time the engine was switched off was greater

than 3 km/h.

› The front wheels are not turned excessively (the steering angle is less than 3/4

of a steering wheel revolution).

 

Conditions for an automatic restart (start phase)

› The clutch is depressed.

› The max./min. temperature is set.

› The Defrost function for the windshield is switched on.

› A high blower stage has been selected.

› The START STOP button is pressed.

 

Conditions for an automatic restart without driver intervention

› The vehicle moves at a speed of more than 3 km/h.

› The difference between the outdoor- and the set temperature in the interior is

too great.

› The charge state of the vehicle battery is not sufficient.

› There is insufficient pressure in the braking system.

 

It does sort of contradict itself really ... 

 

Conditions for the automatic engine shut down (stop phase)

› The charge state of the vehicle battery is sufficient.

 

Conditions for an automatic restart without driver intervention

› The charge state of the vehicle battery is not sufficient.

 

Now mine stopped OK then about 30 seconds later restarted... Which is why I suspected the internal temp was too warm so the AC was needed .. 

 

Stuart, I have the same issues. Engine sounds louder but not bothered much by it, I assumed it was starting to loosen up. The engine does restart, I have noticed this when it is on a short journey, the power need to start the car from cold is, so I have been led to believe is quite high, plus lights on, heater on etc, the alternator kicks I power it all.

 

I would not say it bothers me, if I remember right my Exeo did the same thing, it is just slightly noisier now around the 1500-2000 RPM range just as if it want another gear..