Car rolls forward while in gear...

pnewton1958 · Oct 14, 2019

Deadgame said:
Just finished installing front and rear brake pads and after burnishing them, I backed the car up into my driveway which has a little bit of an incline. I put the car in 1st and didn't set the parking brake. After shutting the car off I noticed every 3-5 seconds the car would slowly roll forward a couple inches and then stop like it was locking into place. It would continue to inch it's way down the driveway every 3-5 seconds if I let it. I put the car in reverse and it did the same thing. I always use the parking brake on an incline so I've never experienced this before. Is this normal or do I have a problem Houston?

My 2018 CTR did this on the first day i drove it. My young nephew came into the house all upset that the car was moving. Thought it strange at the time but i now ensure that the parking brake is applied.

Gansan · Oct 14, 2019

This is really crazy and interesting info. The compression ratio of DI engines is very high (one of the advantages of DI) so there must be some other reason. Like someone was mentioning, is it plausible that the cam phasing when the engine is at turned off somehow leaves valve overlap? Doesn't seem possible during the compression stroke. Or the piston rings by design are somehow leaky--not in a bad way, but in a way that affects how the engine behaves when it is off.

This is kind of scary, because now instead of two layers of protection from accidental slow roll-away, your parking brake is now the only thing.

Arcam · Oct 14, 2019

Gansan said:
This is really crazy and interesting info. The compression ratio of DI engines is very high (one of the advantages of DI) so there must be some other reason. Like someone was mentioning, is it plausible that the cam phasing when the engine is at turned off somehow leaves valve overlap? Doesn't seem possible during the compression stroke. Or the piston rings by design are somehow leaky--not in a bad way, but in a way that affects how the engine behaves when it is off.

This is kind of scary, because now instead of two layers of protection from accidental slow roll-away, your parking brake is now the only thing.

I agree with you but for sure you can not rely on the in gear method to hold the car on any reasonable slope.

djhartm · Oct 14, 2019

Jes_si562 said:
If it's in gear it shouldn't move at all

Not true.

The car can and will move in gear depending upon the degree of slope the car is on.

CivicOops · Oct 14, 2019

This is literally why the parking brake exists. Not trying to be rude but why not just use the parking brake.

Gansan · Oct 14, 2019

CivicOops said:
This is literally why the parking brake exists. Not trying to be rude but why not just use the parking brake.

Parking brakes fail once in a while. That's why we (those of us of a certain age who were taught manual transmission procedures) were taught to put the car in gear in addition to using the parking brake, as a backup. Sort of like turning the wheels when you park on a hill so that the car rolls into the curb if the parking brake fails. Now we have found that we can't rely on the car being in gear.

OneSickFK8 · Oct 14, 2019

CivicOops said:
This is literally why the parking brake exists. Not trying to be rude but why not just use the parking brake.

Yes and no. The parking brake is preferable but really a manual vehicle should be able to be parked using the 1st/Rev gear as a pure failsafe to a faulty electronic brake.

ShaRm3064 · Oct 15, 2019

It happened to me as well.....Parked on a steep drive way put in first with no hand brake and it rolled backwards. I hit the brake once I figured it was rolling.

NoelPR · Oct 15, 2019

Guys can you try this.
If the car is looking down of the incline put it on reverse.
If the car is looking up of the incline then use 1st.

Maybe is just coincidence but I always did it that way when I had manual cars.

tinyman392 · Oct 15, 2019

NoelPR said:
Guys can you try this.
If the car is looking down of the incline put it on reverse.
If the car is looking up of the incline then use 1st.

Maybe is just coincidence but I always did it that way when I had manual cars.

That’s what they are doing. And what they are saying is that it rolls when you do something this without stud handbrake

NoelPR · Oct 15, 2019

tinyman392 said:
That’s what they are doing. And what they are saying is that it rolls when you do something this without stud handbrake

Right didn't saw the last sentence of the OP.

So the obvious solution is to always use Parking Brake as you were supposed to. :nixon:

Arcam · Oct 15, 2019

NoelPR said:
Guys can you try this.
If the car is looking down of the incline put it on reverse.
If the car is looking up of the incline then use 1st.

Maybe is just coincidence but I always did it that way when I had manual cars.

That is the wrong way round and you run the risk of turning the engine over backwards and damaging valve/camshaft/cam drive systems, not good.

If facing uphill use reverse and if facing down use 1st.

NoelPR · Oct 15, 2019

Arcam said:
That is the wrong way round and you run the risk of turning the engine over backwards and damaging valve/camshaft/cam drive systems, not good.

If facing uphill use reverse and if facing down use 1st.

Dude the timing belt/chain will sync all those components up. Nothing will break as you said.

Anyway I don't know why this is an issue and why so many are loosing their minds the manual clearly says

Honda Civic 10th gen Car rolls forward while in gear... upload_2019-10-15_14-24-58

GraphiteAZ · Oct 15, 2019

Deadgame said:
Hey man, troll elsewhere.

Meanwhile five other people have said the same as me. Set the parking brake.

Only time not to set the brake?

When you're done with a 15+ minute track session. Then leave the car in gear on a flat surface.

NoelPR · Oct 15, 2019

GraphiteAZ said:
Meanwhile five other people have said the same as me. Set the parking brake.

Only time not to set the brake?

When you're done with a 15+ minute track session. Then leave the car in gear on a flat surface.

why?

Car rolls forward while in gear...

pnewton1958

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