Restarting a car engine which is already "ON'

bkm · 26th February 2008, 11:15

Chevy spark engine is so noiseless that thrice 3/4 times it happened on new spark that my relative tried to restart the engine which was already on . There was Khssssss sound .It happened due to chaotic situation created as my car engine became off apparently and there was traffic jam behind my car.
What are the implications of inadvertently restarting a already 'on' engine? and whether 2/3 times doing so would have caused any harm? i am technically not good so am I asking.

amohit · 26th February 2008, 12:30

hi bkm.
welcome to the world of "silent" engines.

Read this: http://www.team-bhp.com/forum/techni...my-esteem.html

Even I faced this same problem. But with time I was able to get over this issue. AFAIK, torturing the engine once in a while is not that harmful(provided this does not become a regular habit )

Regards,

androdev · 26th February 2008, 13:14

i have been planning to ask this question myself. i remember reading in my car manual (laura) that "restart" when engine is already running will be ignored by the computer. in fact, when the engine stalls, i have to turn the key in to OFF position and only then turning on will work. but i have never tried to restart when the engine is running as there is enough diesel engine noise :-)

flipsyde · 26th February 2008, 13:18

you'll be looking at buying a new starter motor sooner than you think!

if you have a tacho sneak a peak before u turn the ignition key....... has happened to me on a couple of occasions.

aravindwarrier · 26th February 2008, 13:30

Some cars Do have in built protection against accidental cranking, while the engine is running, Like in a fiat palio. I do not think u can retrofit this at a later stage.And i guess accidental cranking can cause excessive wear to your starter motor.

Blue Thunder · 26th February 2008, 13:33

Quote:

Originally Posted by bkm

What are the implications of inadvertently restarting a already 'on' engine? and whether 2/3 times doing so would have caused any harm? ...

This could result in starter-motor ring gear (not the starte motor itself) damage and also potentially damage the solenoid actuator which causes the starter motor to engage with the ring gear. The "kkkrrrrrrr"

noise that you hear is the ring gear and starter motor gear trying to engage at high speeds. They are designed to engage only at low speeds.

arunnn · 26th February 2008, 13:44

Spark engine is super silent... I did the same thing (restart ) when I took a TD on spark, and two other customer also did the same thing in front of me !! U can't make out its running.
Make it a habit to trun the key to off position and start again ( if you are in doubt)

BUSA · 26th February 2008, 13:47

By doing so you will be causing starter problems.

Ajaybiz · 26th February 2008, 14:00

No harms only the gears of starter motor and engines fly wheel gears(where starter rotates the engine) will go off soon.

Sankar · 26th February 2008, 14:36

Everybody install free flow mufflers and you won't crank the aleady running engine

But realistically speaking how hard is it for the manufacturers to built-in a anti crank system into their ECUs to prevent accidental cranking of the starter motor? I don't think it is that difficult.

And if you think hard enough you can already come up with a system that can be made to retrofit into the engines without such a facility. It's about adding a relay to the circuit. The relay can be triggered by a circuit which will have an on/off state (or carry/not carry current) depending on status of the engine.

Su-47 · 26th February 2008, 15:55

How come I never had this problem in my Safari 3.0?
--- Rolling on the floor laughing like a mad man ------

Rotorhead · 26th February 2008, 15:59

Quote:

Originally Posted by Sankar

Everybody install free flow mufflers and you won't crank the aleady running engine

thats a good one...get the free flows installed and keep the windows down all time..

U should be ok as long as it doesnt becomes a habit..or or pretty soon u will have to be replacing the starter..

Sankar · 26th February 2008, 16:29

Quote:

Originally Posted by Su-47

--- Rolling on the floor laughing like a mad man ------

ROTFLLAMM....

Dicor must be having it inbuilt in the ECU.

deepakhon · 26th February 2008, 16:35

If you have a tacho, you could probably check its readings. If it is anywhere b'ween 800 and 1k, your engine is on and you are idling. No need to crank your engine again.

Blue Thunder · 26th February 2008, 16:41

Quote:

Originally Posted by deepakhon

If you have a tacho, you could probably check its readings. If it is anywhere b'ween 800 and 1k, your engine is on and you are idling. No need to crank your engine again.

If it is anywhere above 0, the engine is on

26th February 2008, 11:15	#1
bkm BHPian Join Date: Oct 2007 Location: Mumbai Posts: 95 Thanked: 0 Times	Restarting a car engine which is already "ON' Chevy spark engine is so noiseless that thrice 3/4 times it happened on new spark that my relative tried to restart the engine which was already on . There was Khssssss sound .It happened due to chaotic situation created as my car engine became off apparently and there was traffic jam behind my car. What are the implications of inadvertently restarting a already 'on' engine? and whether 2/3 times doing so would have caused any harm? i am technically not good so am I asking.
	() Thanks

26th February 2008, 12:30	#2
amohit BHPian Join Date: Jul 2007 Location: Bangalore Posts: 451 Thanked: 52 Times	hi bkm. welcome to the world of "silent" engines. Read this: http://www.team-bhp.com/forum/techni...my-esteem.html Even I faced this same problem. But with time I was able to get over this issue. AFAIK, torturing the engine once in a while is not that harmful(provided this does not become a regular habit ) Regards,
	() Thanks

26th February 2008, 13:14	#3
androdev Distinguished - BHPian Join Date: May 2007 Location: bangalore Posts: 3,097 Thanked: 22,341 Times	i have been planning to ask this question myself. i remember reading in my car manual (laura) that "restart" when engine is already running will be ignored by the computer. in fact, when the engine stalls, i have to turn the key in to OFF position and only then turning on will work. but i have never tried to restart when the engine is running as there is enough diesel engine noise :-)
	() Thanks

26th February 2008, 13:18	#4
flipsyde BHPian Join Date: Nov 2006 Location: Chennai Posts: 644 Thanked: 84 Times	you'll be looking at buying a new starter motor sooner than you think! if you have a tacho sneak a peak before u turn the ignition key....... has happened to me on a couple of occasions.
	() Thanks

26th February 2008, 13:30	#5
aravindwarrier BHPian Join Date: May 2007 Location: Cochin Posts: 144 Thanked: 14 Times	Some cars Do have in built protection against accidental cranking, while the engine is running, Like in a fiat palio. I do not think u can retrofit this at a later stage.And i guess accidental cranking can cause excessive wear to your starter motor.
	() Thanks

26th February 2008, 13:44	#7
arunnn BHPian Join Date: Oct 2007 Location: Bangalore Posts: 74 Thanked: 2 Times	Spark engine is super silent... I did the same thing (restart ) when I took a TD on spark, and two other customer also did the same thing in front of me !! U can't make out its running. Make it a habit to trun the key to off position and start again ( if you are in doubt)
	() Thanks

26th February 2008, 13:47	#8
BUSA Senior - BHPian Join Date: Aug 2005 Location: Bombay Posts: 5,130 Thanked: 20 Times View My Garage	By doing so you will be causing starter problems.
	() Thanks

26th February 2008, 14:00	#9
Ajaybiz BANNED Join Date: Nov 2004 Location: Bangalore Posts: 1,440 Thanked: 320 Times View My Garage	No harms only the gears of starter motor and engines fly wheel gears(where starter rotates the engine) will go off soon.
	() Thanks

26th February 2008, 14:36	#10
Sankar Senior - BHPian Join Date: May 2005 Location: Location Posts: 5,766 Thanked: 9,054 Times	Everybody install free flow mufflers and you won't crank the aleady running engine But realistically speaking how hard is it for the manufacturers to built-in a anti crank system into their ECUs to prevent accidental cranking of the starter motor? I don't think it is that difficult. And if you think hard enough you can already come up with a system that can be made to retrofit into the engines without such a facility. It's about adding a relay to the circuit. The relay can be triggered by a circuit which will have an on/off state (or carry/not carry current) depending on status of the engine.
	() Thanks

26th February 2008, 15:55	#11
Su-47 BHPian Join Date: Aug 2006 Location: Bangalore Posts: 692 Thanked: 337 Times	How come I never had this problem in my Safari 3.0? --- Rolling on the floor laughing like a mad man ------
	() Thanks

26th February 2008, 16:35	#14
deepakhon Senior - BHPian Join Date: Oct 2004 Location: Bangalore Posts: 1,441 Thanked: 65 Times	If you have a tacho, you could probably check its readings. If it is anywhere b'ween 800 and 1k, your engine is on and you are idling. No need to crank your engine again.
	() Thanks