Does this Car Push/Roll Start?

[Ryguystye]

In the event of the battery being too low to start normally, can I start this car with a push/roll? Or do the modern ignition and fuel systems require me to use jumper cables?

[FRSBRZGT86FAN]

Originally Posted by Ryguystye

In the event of the battery being too low to start normally, can I start this car with a push/roll? Or do the modern ignition and fuel systems require me to use jumper cables?

If it's manual and the ignition is in the on position you can push start it like any other manual car with a dead battery. The ecu tune does the same process as it would do when the starter kicks over fuel injection or not.

But it's no substitute for not having jumper cables in your car to help a friend or something, you can practice it a bit if your bored honestly up a hill or down a incline in reverse or 1st I used to do it when I had a manual corolla, but don't keep doing it repeatedly for no reason.

[86 South Africa]

What about cars with keyless entry/push start?

[pushrod]

I've bump started my car before. Same experience as doing it to a car from the 60s, the only difference is that this car WREAKS of gas for about 5 min afterwards.

[steve99]

Originally Posted by 86 South Africa

What about cars with keyless entry/push start?

yes works fine


push start button twice without depressing clutch to turn ignition full on.


Then clutch in push car select a gear and let clutch out.




with all modern cars though you need enough power in battery to run the ecu and ignition/injectors for a push start, so if battery is completely dead theirs no chance. Only works if battery just not strong enough to turn starter motor

[Tcoat]

Originally Posted by 86 South Africa

What about cars with keyless entry/push start?

You would have to be rolling when you pushed the button and there would have to be enough charge left in the battery for the circuit to sense the fob and know you pushed the button. It may work but would be very tricky and I don't think it would be a good idea to try it.


Edit: Not fast enough again. What Steve said^^^

[ls1ac]

He is right on, there has to be enough of a charge to fire the coil packs. Unlike the cars of old the push will not spin the alternator fast enough to charge the ignition system. It takes a lot more to spin the starter, as you will notice every thing going dim. Starting in second gear is also easier as you are not turning engine over as fast. Lastly, if you use a toe strap you can charge a dead system but be aware the car will jump forward when it starts so use a longer tow strap.

[mdm]

I read somewhere (including manuals of FRS and of other cars) that with pushstarts there is a danger of overheating/fire of the catalytic converter. I it's about unburnt fuel getting there before the engine starts running. No idea though how real the danger is.

[FRSBRZGT86FAN]

Originally Posted by mdm

I read somewhere (including manuals of FRS and of other cars) that with pushstarts there is a danger of overheating/fire of the catalytic converter. I it's about unburnt fuel getting there before the engine starts running. No idea though how real the danger is.

Doubtful, there are many other situation where with a tune where unburnt fuel enters the exhaust stream when the engine is essentially off throttle.

[Tcoat]

Originally Posted by mdm

I read somewhere (including manuals of FRS and of other cars) that with pushstarts there is a danger of overheating/fire of the catalytic converter. I it's about unburnt fuel getting there before the engine starts running. No idea though how real the danger is.

Originally Posted by FRSBRZGT86FAN

Doubtful, there are many other situation where with a tune where unburnt fuel enters the exhaust stream when the engine is essentially off throttle.

Not to mention that if you have raw fuel in that quantity pouring into your cats then the engine is going to be so badly flooded that it will not start anyway. Without starting there is no heat to ignite the fuel.

Not sure but doubt it would burn even if running though since the exhaust gases would likely deplete the oxygen to below the level required for combustion. Could be wrong on that though since I have no idea what the oxygen level in exhaust gases may be.

[86 South Africa]

Best I don't let my battery die then! :-)

[mdm]

Originally Posted by Tcoat

Not to mention that if you have raw fuel in that quantity pouring into your cats then the engine is going to be so badly flooded that it will not start anyway. Without starting there is no heat to ignite the fuel.

Without researching it any more, I'd theorize the following scenario.

During Several unsuccessful attempts at push-start the air-fuel mixture flows through the engine and fuel is collected in cold cat. When the engine ultimately starts, the cat heats up, and suddenly you have a significant amount of fuel in the presence of very hot catalysts, and things get nasty.

One thing that my brilliant theory does not explain, is why things would be any different if a few unsuccessful starts using the starter are followed by successful start.

[Ultramaroon]

meh

[Tcoat]

Originally Posted by mdm

Without researching it any more, I'd theorize the following scenario.

During Several unsuccessful attempts at push-start the air-fuel mixture flows through the engine and fuel is collected in cold cat. When the engine ultimately starts, the cat heats up, and suddenly you have a significant amount of fuel in the presence of very hot catalysts, and things get nasty.

One thing that my brilliant theory does not explain, is why things would be any different if a few unsuccessful starts using the starter are followed by successful start.

Nope No fires in the exhaust of a running car. Just as I thought there is just not enough oxygen to burn the fuel. Now if you don't evaporate it all and shut it down allowing the oxygen to enter the system...