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Unexpected Acceleration

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Anonymous

Guest
Hi all. Anyone experienced this worrying issue?

Every now and again, when I depress the clutch and start to change down gear the car seems to continue to accelerate, it almost feels like I have flicked on the cruise control and am getting that initial boost of power?
 
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Anonymous

Guest
Not really relevant but, I had this problem with a Ford Escort and it took an age to diagnose the fault. Went to several main dealers but in the end it was sorted by a proper time served mechanic rather than a dealer tech guy. Not a hope of remembering what the cause was, but the part required cost peanuts by comparison to what the stealer's charged for not repairing it.
 
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Anonymous

Guest
your not on a slope are you? :lol: know thats a silly question but maybe ..
 
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Anonymous

Guest
ryanb-i had same problem but also happened when changing gears, the accelerator seemed to stick on for a second or two. anyway peugeot have changed the accelerator mechanism and its ok now.mine is a hdi. :dance:
 
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Anonymous

Guest
ron - escorts have a cable but rczs have not. :beer:
 
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Anonymous

Guest
Hi ryanb, I noticed this when I first got my HDi. It would happen when I was pulling away from being stationery at very low speed and only using my clutch to manoeuvre with no gas applied. I also noticed it doing this when pulling away on a very steep hill (No hill start activated). I would describe it as almost an anti stall mechanism which would kick in to compensate for the lack of gas. I thought of it as an engine trait and not as a fault. I have not noticed it doing it for a long time. Maybe the computer has worked out my driving style and noted that my clutch control no longer requires its help. :lol: :greetings-wavingblue:
 
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Anonymous

Guest
bee said:
ryanb-i had same problem but also happened when changing gears, the accelerator seemed to stick on for a second or two. anyway peugeot have changed the accelerator mechanism and its ok now.mine is a hdi. :dance:
Click to expand...

Thanks Bee that's sounds exactly the same issue, I think i will take it to the dealers and see what they say.
 
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Anonymous

Guest
ryanb said:
Hi all. Anyone experienced this worrying issue?

Every now and again, when I depress the clutch and start to change down gear the car seems to continue to accelerate, it almost feels like I have flicked on the cruise control and am getting that initial boost of power?
Click to expand...

That's very odd...if you depress the clutch you are removing the drive from the engine to the gearbox so it should be impossible for the car to accelerate , it's like saying a car can accelerate while in neutral.
 
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Anonymous

Guest
Rcz9191 said:
That's very odd...if you depress the clutch you are removing the drive from the engine to the gearbox so it should be impossible for the car to accelerate , it's like saying a car can accelerate while in neutral.
Click to expand...
Well mine certainly used to. In fact I had to apply the foot brake to slow the damn thing down on occasions.
 
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Anonymous

Guest
It happens so quick that it may be that I have not actually pressed the clutch, but I certainly have to press it quick and then the brake before I have a dented front end!!!
 
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Anonymous

Guest
This is a characteristic of the diesel engine and one reason why it is harder to stall a diesel. The clutch requires depressing to disengage the drive at a slightly earlier point than on a petrol engine car. As the vehicle slows down in gear there comes a point when the engine braking cannot slow any further. To continue slowing past this point without pressing the clutch will result in the engine trying to keep running rather than stall, hence getting the surge. :greetings-wavingblue:
 
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Anonymous

Guest
Just read this and am very interested as I became aware of the diesel surge at low revs with my 308 SW which has an HDI 112 and again now with my HDI 163 RCZ. I have got to be honest and say that I saw it as being an asset rather than a worry as it seemed that I could drive more economically and just cruise on the surge, once I learned to use it that is. I find it particularly useful with urban driving. There are times when you have to control it with the brake. By the way I am sure it only happens when the clutch is at least partly engaged.

I have a question though. Is it more economical just because I don't press on the gas pedal?

Or is it like cruise with the engine using fuel in the same way?

I would like to think that I am just cruising on the fuel I have injected and not the computer.
 
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Anonymous

Guest
Hi 308 State, You say that you are sure it only happens when the clutch is at least partly engaged. Slowing the car down by disengaging the drive and then engaging the drive using this method to cause the surge would suggest you are possibly slipping the clutch. This method will put wear and tear on the clutch (which is expensive to replace) and cause the engine to labour. I doubt if any fuel saving would be achieved using this method of control as the engine is not working at its optimum speed. It also suggests that the car is being driven in too high a gear for the road and traffic conditions. A lower gear should be selected to match road speed with the gear using the accelerator to control the speed thus removing the need to brake as often. Selecting a lower gear in an urban area will also enable you to have a vehicle which will respond to the accelerator more effectively either faster or slower should the need arise. May I add that I have over 25yrs advanced driving experience in car, motorcycle and HGV and was a driving instructor (ADI) for 15yrs. This response is not to criticise your driving in any way shape or form but my analysis of your facts. :greetings-wavingblue:
 
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Anonymous

Guest
I have this issue and I think that it is a combination of two different systems on the HDi RCZ. The first is an anti stall mechanism that senses a drop in revs and automatically applies a little throttle to bring the engine speed up, mine usually jumps to around 1200 rpm when this happens. The reason that this happens is due to the hill assist function. This causes the car to hold the brakes for .75 of a second when moving off on a hill. This works really well on my wife's EGS C4 (and on my Smart Roadster for that matter) which both have automated clutches on manual gearboxes, but can be a real pain on a proper manual car.

I notice it mostly when I park on my driveway at home. When I pull into my parking space, I stop when the parking sensors start shouting. I then just lift the clutch to creep forward until the parking sensors give a 'flatline' stop. The problem is that my driveway has a very slight slope, so the car detects this as a hill and engages the hill assist which holds the brakes. The ant-stall mechanism senses the revs dropping due to the car trying to move forward against the brakes so applies a little throttle to increase revs, just at the point that the hill assist releases the brakes. Result: an uncontrolled jump forward, a scramble for the brakes and a pounding heart.

Just my tuppence

Kevin
 
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