Swift - throttle response

ballkey · 26th May 2008, 13:23

I've a new problem - after a cold start, the revs keep climbing even after I take my foot of the accelerator. For example, when changing gears, I just take my foot of the pedal, depress the clutch and try to shift. Now that the revs keep climbing, depressing the clutch makes it go even further, and suddenly I look like a stupid boyracer.

This happens only for some 5 minutes or so; once she's warmed up, everything's back to normal. Could this be a problem, or am I just missing a maintenance ritual?

Stats - the car is a 2.5 year old Petrol Vxi; done about 35k.

bblost · 26th May 2008, 13:35

From what you have written it appears you press the acc pedal before you start the engine.

You will find a small sticker on your car that specifically asks you to not do this.

The proper way to start a car is to sit down without pressing any pedals.
Ignition.
Wait for a minute and then engage the gear and take off.

Preferably keep all electric components Off.
No ICE, AC or headlight(at least for the first start of the day) when the car is being switched on.

esteem_lover · 26th May 2008, 13:40

If you read through the technical section of this forum you will realise that it is a feature in the MPFI cars to idle at 1000rpm when the engine is cold & will settle down to 900 rpm once it is heated up.

Sankar · 26th May 2008, 14:17

Yep i agree with EL, nothing to worry about, it's the case with most mpfi cars have experienced it in Wagon R and Zen (old) too. Once the car is wormed up the idling would return to normal.

dadu · 26th May 2008, 14:24

Get the spark plugs cleaned !!!

Quote:

Originally Posted by ballkey

I've a new problem - after a cold start, the revs keep climbing even after I take my foot of the accelerator. For example, when changing gears, I just take my foot of the pedal, depress the clutch and try to shift. Now that the revs keep climbing, depressing the clutch makes it go even further, and suddenly I look like a stupid boyracer.

This happens only for some 5 minutes or so; once she's warmed up, everything's back to normal. Could this be a problem, or am I just missing a maintenance ritual?

Stats - the car is a 2.5 year old Petrol Vxi; done about 35k.

Surprise · 26th May 2008, 14:39

Quote:

Originally Posted by bblost

Preferably keep all electric components Off.
No ICE, AC or headlight(at least for the first start of the day) when the car is being switched on.

Is that really required? I remember reading in one of the threads that for a moment supply will not be there protecting these equipments,

ballkey · 26th May 2008, 15:03

@Dadu: will check on that.

All, I do understand the idling revs are slightly higher - but my problem is not at idling - it's when she's already rolling. It's like having a stuck accelerator pedal - that's why it's disconcerting.
And I do switch off electrics before switching her off.

Sankar · 26th May 2008, 15:42

Is it with the AC on? Does it happen when the AC is off?

dadu · 26th May 2008, 15:47

Then I will also suggest a cleanup of throttle assembly and inspection of cable, it might need change.

Quote:

Originally Posted by ballkey

@Dadu: will check on that.

All, I do understand the idling revs are slightly higher - but my problem is not at idling - it's when she's already rolling. It's like having a stuck accelerator pedal - that's why it's disconcerting.
And I do switch off electrics before switching her off.

hyper123 · 26th May 2008, 15:47

Quote:

Originally Posted by ballkey

@Dadu: will check on that.

All, I do understand the idling revs are slightly higher - but my problem is not at idling - it's when she's already rolling. It's like having a stuck accelerator pedal - that's why it's disconcerting.
And I do switch off electrics before switching her off.

You have a tachometer right? To what RPM does the engine revs rise when you get off the acc pedal? Looking at that, we can tell whether it is because of the cold engine or its something else.

cyneverdie · 26th May 2008, 23:58

Quote:

Originally Posted by bblost

The proper way to start a car is to sit down without pressing any pedals.
Ignition.
Wait for a minute and then engage the gear and take off.

Preferably keep all electric components Off.
No ICE, AC or headlight(at least for the first start of the day) when the car is being switched on.

For the swift petrol at least , in the manual it tells you to keep the clutch pressed on startup , its important too

GTO · 27th May 2008, 12:56

Thats not a problem at all; it is typical of MPFi cars. In fact, I have seen some that would idle as high as 1,500 rpm when cold. Things return to normal once warmed up.

Just to ensure, have them run a check on your idle settings at the next scheduled service.

ballkey · 27th May 2008, 13:23

GTO, as I mentioned earlier - it's not at idling, it's when she's already rolling.

@dadu: thanks - looks like a service center trip is due.

GTO · 27th May 2008, 16:57

Quote:

Originally Posted by ballkey

GTO, as I mentioned earlier - it's not at idling, it's when she's already rolling.

I know exactly the situation you talk about. If, at cold idle, the needle is at say 1400 rpms, when you release the clutch (while driving), it will still shoot up.

dinar · 27th May 2008, 17:10

Do you warm up the engine properly, or just start and roll? there is a fast idle system programed in the ECU, when it's cold and the temperature sensor[coolent temp] senses the temp below the acceptable limit,this will keep on happening.
There is a IAC valve which does all this, get it checked if you are not doing any thing wrong when heating the engine.

26th May 2008, 13:23	#1
ballkey BHPian Join Date: Sep 2005 Location: Chennai Posts: 425 Thanked: 35 Times	Swift - throttle response I've a new problem - after a cold start, the revs keep climbing even after I take my foot of the accelerator. For example, when changing gears, I just take my foot of the pedal, depress the clutch and try to shift. Now that the revs keep climbing, depressing the clutch makes it go even further, and suddenly I look like a stupid boyracer. This happens only for some 5 minutes or so; once she's warmed up, everything's back to normal. Could this be a problem, or am I just missing a maintenance ritual? Stats - the car is a 2.5 year old Petrol Vxi; done about 35k.
	() Thanks

26th May 2008, 13:35	#2
bblost Team-BHP Support Join Date: Jul 2007 Location: Hyderabad Posts: 11,008 Thanked: 15,366 Times View My Garage	From what you have written it appears you press the acc pedal before you start the engine. You will find a small sticker on your car that specifically asks you to not do this. The proper way to start a car is to sit down without pressing any pedals. Ignition. Wait for a minute and then engage the gear and take off. Preferably keep all electric components Off. No ICE, AC or headlight(at least for the first start of the day) when the car is being switched on.
	() Thanks

26th May 2008, 13:40	#3
esteem_lover Senior - BHPian Join Date: Jul 2006 Location: Madras/Py Posts: 7,556 Thanked: 502 Times View My Garage	If you read through the technical section of this forum you will realise that it is a feature in the MPFI cars to idle at 1000rpm when the engine is cold & will settle down to 900 rpm once it is heated up.
	() Thanks

26th May 2008, 14:17	#4
Sankar Senior - BHPian Join Date: May 2005 Location: Location Posts: 5,766 Thanked: 9,054 Times	Yep i agree with EL, nothing to worry about, it's the case with most mpfi cars have experienced it in Wagon R and Zen (old) too. Once the car is wormed up the idling would return to normal.
	() Thanks

26th May 2008, 15:03	#7
ballkey BHPian Join Date: Sep 2005 Location: Chennai Posts: 425 Thanked: 35 Times	@Dadu: will check on that. All, I do understand the idling revs are slightly higher - but my problem is not at idling - it's when she's already rolling. It's like having a stuck accelerator pedal - that's why it's disconcerting. And I do switch off electrics before switching her off.
	() Thanks

26th May 2008, 15:42	#8
Sankar Senior - BHPian Join Date: May 2005 Location: Location Posts: 5,766 Thanked: 9,054 Times	Is it with the AC on? Does it happen when the AC is off?
	() Thanks

27th May 2008, 12:56	#12
GTO Team-BHP Support Join Date: Feb 2004 Location: Bombay Posts: 70,546 Thanked: 300,789 Times View My Garage	Thats not a problem at all; it is typical of MPFi cars. In fact, I have seen some that would idle as high as 1,500 rpm when cold. Things return to normal once warmed up. Just to ensure, have them run a check on your idle settings at the next scheduled service.
	() Thanks

27th May 2008, 13:23	#13
ballkey BHPian Join Date: Sep 2005 Location: Chennai Posts: 425 Thanked: 35 Times	GTO, as I mentioned earlier - it's not at idling, it's when she's already rolling. @dadu: thanks - looks like a service center trip is due. Last edited by ballkey : 27th May 2008 at 13:24. Reason: spelling
	() Thanks

27th May 2008, 17:10	#15
dinar Senior - BHPian Join Date: Mar 2006 Location: goa Posts: 1,066 Thanked: 57 Times	Do you warm up the engine properly, or just start and roll? there is a fast idle system programed in the ECU, when it's cold and the temperature sensor[coolent temp] senses the temp below the acceptable limit,this will keep on happening. There is a IAC valve which does all this, get it checked if you are not doing any thing wrong when heating the engine.
	() Thanks