high engine revs

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mandiran

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glenrothes
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ZS Hybrid+ Trophy
I would agree with Bill Mitchison and also Nicho, to me the engine revs are far too high; sometimes at under 30mph 3100 revs and carries on for maybe quarter of a mile . And this happens quite a lot. This really spoils a really good car. MG needs to address this problem quickly as those engines won't last long.
 
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At the risk of repetition.
Keep in mind that the ‘engine’ is also providing electrical power for other uses. For example air conditioning, fans, heated seats/steering wheel, lights, etc.
If you look at the dash power distribution display, you will see how the ‘power’ system continually monitors and controls power distribution.
This is the worst time of year, in warmer times the engine will not be needed as much and the revs will be lower.
 
Thanks for your reply Noel, and i do appreciate what you are saying but on having toyota hybrids before my MG they did rev at certain times but not as often as the MG. I collected my car from the dealer at the end of november and the month of december here has been the mildest on record temps up to 14c so the car should be performing fairly well. It has been back to the dealer for this problem and they have found nothing untoward, when i spoke to the technician about it and mentioned toyota HIS WORDS WERE ITS NOT A TOYOTA not very encouraging, not the response i was looking for, my next step possibly someone in charge at MG MOTORS UK. dealer will have another chance
 
It would be nice if the MG had an additional electric heater, then the combustion engine would only have to run when it is really needed and not constantly to heat the passenger compartment. This is unnecessary fuel consumption, because it stays on even when the battery is full.
 
I have the MG3 hybrid automatic 2024 and the revs are so loud going up a slight hill that I worry the engine is going to blow up, it s like you go into neutral literally put your foot to the floor , so I end up taking my foot off the accelerator, which does not help.
 
Noel said:
At the risk of repetition.
Keep in mind that the ‘engine’ is also providing electrical power for other uses. For example air conditioning, fans, heated seats/steering wheel, lights, etc.
If you look at the dash power distribution display, you will see how the ‘power’ system continually monitors and controls power distribution.
This is the worst time of year, in warmer times the engine will not be needed as much and the revs will be lower.
Click to expand...
I believe fully that electrics bar the heater,fans and AC are from the 12v battery. I keep AC off and revs only affected by it. Steering wheel unit. Steering wheel and heated seats not affected.
 
Noel said:
At the risk of repetition.
Keep in mind that the ‘engine’ is also providing electrical power for other uses. For example air conditioning, fans, heated seats/steering wheel, lights, etc.
If you look at the dash power distribution display, you will see how the ‘power’ system continually monitors and controls power distribution.
This is the worst time of year, in warmer times the engine will not be needed as much and the revs will be lower.
Click to expand...
Hi Noel what am i looking for on the dash power display.
 
I took my car into the dealer today so they can look at this issue and update the software as required. They gave me a new ZS petrol courtesy car, it has the same 1.5 litre engine as the hybrid. There is a fairly steep hill on my route home which always causes my vehicle to perform the overrevving nuisance. This car has a five speed manual gearbox and it was not happy climbing the hill in fourth gear even though I was only traveling at the 40 mph speed limit. Pressing the accelerator didn't make any difference so I had to change down to third gear, much higher revs but it did seem to be better. The hybrid must be a heavier car than this version so if I need to be in a lower gear in this vehicle it does not surprise me that the hybrid needs to drop down a gear or possibly two.
Another odd problem I noticed last week, I took my car for its first long drive about four hours in total, after about two hours I noticed an noise coming from the loudspeaker on my righthand side. It sounded like a bong repeated every second not very loud but annoying. I stopped the car about an hour later and when I restarted it the sound had stopped. I drove home a week later and the same sound started again after a couple of hours and continued all the way home. Something else the garage is looking into.
 
Ken K said:
I took my car into the dealer today so they can look at this issue and update the software as required. They gave me a new ZS petrol courtesy car, it has the same 1.5 litre engine as the hybrid. There is a fairly steep hill on my route home which always causes my vehicle to perform the overrevving nuisance. This car has a five speed manual gearbox and it was not happy climbing the hill in fourth gear even though I was only traveling at the 40 mph speed limit. Pressing the accelerator didn't make any difference so I had to change down to third gear, much higher revs but it did seem to be better. The hybrid must be a heavier car than this version so if I need to be in a lower gear in this vehicle it does not surprise me that the hybrid needs to drop down a gear or possibly two.
Another odd problem I noticed last week, I took my car for its first long drive about four hours in total, after about two hours I noticed an noise coming from the loudspeaker on my righthand side. It sounded like a bong repeated every second not very loud but annoying. I stopped the car about an hour later and when I restarted it the sound had stopped. I drove home a week later and the same sound started again after a couple of hours and continued all the way home. Something else the garage is looking into.
Click to expand...
It could have been the 'take a break' warning. I've had that and a small coffee cup flashes up as well
 
Thanks that makes sense.

The dealer claims they tested my car yesterday and were unable to reproduce the overrevving problem. My car has had all the available updates including the 052 one before I took delivery. Needless to say on the way home from the dealer the car went into overrev mode as I started climbing the first hill.
 
Not doubting what you say, but could you be more specific when you say “overrev mode” please. 3000, 3500, 5000. I only ask as it appears to me, that in order to prevent “power loss” when trying to accelerate, PD052 prevents complete depletion, by ensuring the battery always has at least two bars of battery capacity.
This results in higher revs after, for example climbing hills, when the revs will be 3/3500 until the battery is sufficiently replenished.
 
The revs vary and are not dependant on the steepness of the hill. Generally the longer the hill the higher the revs. I regularly visit a friend the journey involves climbing three long but not very steep hills all of which have a 40 mph limit. At the bottom of the hill at approximately 40 mph the revs will be around 1400 as the car climbs the hill normally about two thirds of the way up the revs increase instantly to around 5000, speed does not increase. Even when I reach the top of the hill and am going down the only way to reduce the revs is to release the throttle, either the revs reduce to around 1400 or the car switches into EV mode. This is my first hybrid so I am still learning, pity the manual is absolute rubbish. I am finding the forum helpful so keep up the good work folks.
 
Just had the attached from my dealer. I'm sure Noel will agree that it is not specific and therefore not helpful and quite unprofessional. They need to say what they consider 'normal high revving' is so that we know if there is a problem on some of the cars or not. I don't mind the occasional 3500 revs but as I and several others often get 5000 revs does that indicate our cars have an issue? The noise the engine makes at these revs really is off putting to myself and causes alarm to passengers. Should all of us who have this issue respond directly to MG technical requesting this clarification. The mpg also drops rapidly when the high revs occur and so also does affect overall mpg. It seems like the car can do all of what it says on the tin but not at the same time so don't have A/C on if you want good mpg, don't drive up steep hills and try and overtake anyone, you can have a high rated bhp car but only in short bursts....................
 

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Fascinating. I follow Yaris Cross feeds as that was my next purchase before the ZS. This is much more car and less buck. They have a 12v battery problem. The hybrid engine system does not regenerate it sufficiently. My wee Yaris hybrid died on me twice. Once at a Dublin- France ferry port as boat was leaving.
The MG does not (as yet) have this problem due to revs taking precedent. Just keep AC off! Heater, seats and wheel are fine. I do 10hrs+ in France in the summer . Will be interesting to see how the Air Con does then cooling the cabin down.
 
Hi Robert,
I haven't been on the forum for a while but I'm still experiencing regular over-revving even after the update and 5500 miles on the clock.
In their response to you MG several times refer to a cause of the high revving being to recharge the battery. I do not agree.
Many times I've driven up a hill, with high revs, only for EV to kick in as soon as I plateau.
For example, 2 days ago I drove up a gradual incline of approximately 2 miles at 40 mph with revs of 3.8 to 3.9 all the way. I can accelerate but revs then pass 4.0. I can decelerate but revs don't fall significantly.
Yet at the top of the incline EV immediately kicked in, so presumably the battery had been near full or full most of the way.
So, I can't understand, why didn't the hybrid system use the battery resource at some point during the climb thus allowing the revs to drop? Why do I have to experience 2 miles of over-revving and the associated screaming engine when the battery is seemingly replenished.
I'm still planning on going to the motor Ombudsman but I'm collecting a GoPro from my daughter first to video a few more fun climbs.
 
I have had my mg zs se hybrid 2 weeks now it goes into over revs , once after just five minutes and going down hill , over 4000 plus revs , this is not normal in any car, and needs sorting .
 
I told my dealer the letter was not specific enough and this was there response
Hi Robert,
From doing a little more research they say “When the engine revs to 4/5000rpms the engine is working like a generator to produce electricity for the electric motor to drive the car.”
Other than that, there isn’t any further information provided to us. I apologise that we are unable to assist any further

Also this totally contradicts ghe fact that the manual states not to exceed 3000 revs initially but now they say 4500 revs is normal. This never occurred before the dreaded PD052 update
I have all the same issues as you Nico so it will be interesting to see some videos.
I don't think the car is suited to welsh hills, and a good idea would be to try several MGZS hybrid cars on the same route to see if the issue is car specific or if it is the hilly terrain
 
This is my son's ZS with virtually a full battery,totally unacceptable.
I have the MG3 hybrid on the same road my rev's are around 2000rpm
 

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