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Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - James2018

Lads Aygo. December 2017 model. 998cc engine manual. 2000 miles.

When parking on an incline and facing down hill I advised to put the car in reverse gear, apply the handbrake and point the wheels in to the kerb.

I was surprised to see the car continue to roll forward, even though reverse gear was selected. Obviously the handbrake wasn't applied.

Is this normal (I have been driving automatics for too long)?

Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - RobJP

I was always advised to put the car in first and turn the wheels in whichever appropriate direction when parking. Can't recall any advice to use reverse.

Though that doesn't mean anything. I may have just forgotten that bit.

Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - gordonbennet

Yes, its quite normal, there is no ratchet or similar stopping the engine from being turned over backwards in the case you mention, the use of the engine compression is only meant to assist the handbrake, not the other way round.

As an aside doesn't leaving an automated manual (as fitted to Aygo for instance) take some thinking about to leave in gear, as no Park function on such gearboxes.

Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - Ian D
Yes that can happen, when you put the car in gear and connect the engine to the wheels, you are relying/betting on the compression inside the cylinders being strong enough to counteract the effect of gravity trying to pull the weight of the car down the hill. On mild-enough hills, you'll win that bet, when the hill reaches a certain critical angle, the car will roll.
Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - gordonbennet

Been thinking about why we select the gear which in the event of handbrake failure would see the engine turning backwards, ie reverse when parked downhill, 1st when uphill.

There's probably not much extra resistance to the engine turning over the opposite way, so why do we select the 'other way gear' i wonder, is it because in days gone by if the negine turned over a couple of revolutions it was possible it could fire up and run, this was certainly the case with Diesels of yore with manual 'stop' cables, and i suspect some older petrol designs might have had the same issue, and without thinking about it we've simply picked up on the sensible practices of our mechanically minded forebears.

I have seen some Diesel engines capable of running backwards, a colleague got a Gardner lorry engine to run backwards, yes i am not pulling your legs, but obviously the engine would have no power to speak of, but in theory in the event of a runaway such an engine (cable manual stop) would be capable (if warm) of starting up.

Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - James2018

Thanks for all of your replies.

The Aygo is a nice little car. Very basic and clearly built to a price, but much better than the equivalents I had to put up with when I was 25. It is an ex-demo and saved about £3k of list for 1,200 miles from new and 6 months old, so 4.5 years of warranty left.

Bit sad that the touch screen seems to mirror Andriod Phones but not Apple ones.

Also surprised to see Sat Nav is an extra cost even though the car has a touch screen. A GPS receiver chip is about £10 from RS Components so I wonder what the true cost of implementing it in to a car which already has a touch screen would be for the manufacturer?

(I guess a more powerful CPU for the touch screen, some more memory - if TOMTOM can sell one retail at £100 it can't be much difference considering one of the most expensive components - the screen - is already in the car.)

Edited by James2018 on 18/06/2018 at 00:08

Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - Chris M

I've always used 1st for facing downhill and reverse uphill on the basis of not wanting the engine turning backwards for more than a few turns.

I wonder if any damage can occur when the timing goes out i.e. where the timing belt is tensioned by a spring loaded idler.

Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - John F

I wonder if any damage can occur when the timing goes out i.e. where the timing belt is tensioned by a spring loaded idler.

No damage. Timing would not be altered.

It would take a very steep hill and heavy car to turn over a modern high compression engine in first gear. Experimental results from those with one in three (approx 33%) driveways, please.

Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - Chris M

We have a gentle slope on our drive and in reverse gear pointing uphill, it's possible to get the engine to turn over by giving the the car a fairly gentle shove. I certainly wouldn't rely on putting it in gear alone.

Toyota Aygo - Rolling Down Hill Even Though in Reverse Gear - Peter.N.

Diesel engined vehicles are better for staying where they are they are but even they will creep on an incline but much more slowly as the compression is much higher. The reason that much older diesels would be left in first or reverse depending on the direction the vehicle was facing, was that they had a mechanical fuel shut of device which released after stopping meaning that the engine could start if being turned in the right direction.

All manual cars should be left in first or reverse when parked, don't rely on the handbrake.

Edited by Peter.N. on 19/06/2018 at 12:13