Loss of power in 1st gear

straightdrive · 20th December 2008, 00:12

My UVA has done about 11 k kilometres now.

In heavy bumper to bumper traffic, if I've been alternating between 1st and 2nd gear for some time, there is sometimes a momentary loss of power in 1st gear.

This happens just when after I engage clutch and accelerate to get the car moving from a standstill. Does not happen when the car is moving. The engine keeps running but the car just doesn't respond and the engine vibrations die down to idling level.

If I disengage and engage clutch again, the problem disappears.

It has happened only a few times so am wondering if it is worth spending the minimum of two hours I will need to go to the service centre.

Any ideas anyone?

headers · 20th December 2008, 08:26

it will happen if you leave the clutch before revving the engine!

rjvora_2000 · 20th December 2008, 09:29

Quote:

Originally Posted by headers

it will happen if you leave the clutch before revving the engine!

with you. but i believe this should be checked from garage.

esteem_lover · 20th December 2008, 11:42

Could be a case of clutch overheating ? Do you ride the clutch ? try to avoid that.

vikram_d · 20th December 2008, 11:45

Get the clutch play checked. Sounds like the clutch is little loose. Is it a hydraulic clutch by any chance?

straightdrive · 20th December 2008, 12:11

Thanks for the opinions, guys.

Quote:

Originally Posted by headers

it will happen if you leave the clutch before revving the engine!

I know, however it seems that's not the case here. The engine doesn't stall but just doesn't respond to the accelerator for a moment. And it is a recent problem with no change in my driving style.

Quote:

Originally Posted by esteem_lover

Could be a case of clutch overheating ? Do you ride the clutch ? try to avoid that.

No, I don't ride the clutch. Am particular about that too.

Quote:

Originally Posted by vikram_d

Get the clutch play checked. Sounds like the clutch is little loose. Is it a hydraulic clutch by any chance?

No, as far as I remember the UVa doesn't have a hydraulic clutch. Thinking back I am wondering if the problem is more to do with the accelerator or fuel transmission.

Looks like I had better play safe and go get it checked. Cheers.

the_maassk · 22nd December 2008, 10:02

Just guessing here - but its possible that your fuel cutoff (closed to open loop, happens when you leave the accelerator) is not sync'ed with the throttle position sensor properly. So, if your foot relaxed on the accelerator for a moment, it would cut the fuel and then it would again take a moment to go into closed loop when you press the accelerator.

Gurus can advise. (I may be completely wrong here! - let me know).

aaggoswami · 22nd December 2008, 10:34

Quote:

Originally Posted by the_maassk

Just guessing here - but its possible that your fuel cutoff (closed to open loop, happens when you leave the accelerator) is not sync'ed with the throttle position sensor properly. So, if your foot relaxed on the accelerator for a moment, it would cut the fuel and then it would again take a moment to go into closed loop when you press the accelerator.

Not a guru, but I get the same feeling. Either its clutch or it is some problem related to fuel or ignition. I think that the chances of clutch being the culprit here is less but the real issue is fuel cut off.

hyper123 · 22nd December 2008, 10:45

Quote:

Originally Posted by the_maassk

Just guessing here - but its possible that your fuel cutoff (closed to open loop, happens when you leave the accelerator) is not sync'ed with the throttle position sensor properly. So, if your foot relaxed on the accelerator for a moment, it would cut the fuel and then it would again take a moment to go into closed loop when you press the accelerator.

Gurus can advise. (I may be completely wrong here! - let me know).

AFAIK, the system goes into open loop only at 3/4ths throttle and WOT, other time it is in closed loop. When you let go off the A pedal, the IACV controls the idle RPM and the air flow.

the_maassk · 22nd December 2008, 10:56

I have a ScanGauge II installed on my U-VA. From what it reports - at least on my ride, the system goes into open loop at 3/4 throttle AND every time I release the accelerator, if I am on the move (and using engine braking to slow down; clutch not depressed). If I hit the clutch while I am coasting on momentum, the system goes into a closed loop.

diytry · 12th September 2021, 12:42

Hi,
Hundai accent petrol 2002

There is a loss of power when cold starting th car. It starts and then keeps spluttering. Pressing accelerator does not rev up engine and it continues to splutter. Occasionally it will rev up and then fall back to spluttering.
This phase lasts maybe 5-10 mins (have not timed it) and then engine picks up and drive is normal. Restarting after driving a bit is normal and splutter free.

I read another thread about engine intermittent 'drag' but that is different in that the loss of power is after normal running.
Is there something about startuip phase that can cause this problem? (Actually is not startup phase since it lasts for 5-10 min). The car will only crawl during this time with the spluttering engine supplying minimal power.
Is there anything that needs 'warming up' in a petrol car?

ACe_10 · 12th September 2021, 15:26

I too have faced the same issue in my alto k10. I never really bothered about it as it is very infrequent - happens on some very cold rainy mornings.

The issue is ia very similar to what has been described by op. Pressing the accelerator does not rev up the engine - if you put the car in 1st gear and try to move it, the car stutters and stalls (even if you floor the accelerator pedal). The solution is to keep the car in neutral for around 60-90 seconds, and then it starts behaving normal.

Like I said, never really bothered about the issue given it’s barely an inconvenience. But would nonetheless appreciate if anyone can highlight what is the cause for this.

20th December 2008, 00:12	#1
straightdrive BHPian Join Date: Dec 2008 Location: Hyderabad Posts: 259 Thanked: 6 Times	Loss of power in 1st gear My UVA has done about 11 k kilometres now. In heavy bumper to bumper traffic, if I've been alternating between 1st and 2nd gear for some time, there is sometimes a momentary loss of power in 1st gear. This happens just when after I engage clutch and accelerate to get the car moving from a standstill. Does not happen when the car is moving. The engine keeps running but the car just doesn't respond and the engine vibrations die down to idling level. If I disengage and engage clutch again, the problem disappears. It has happened only a few times so am wondering if it is worth spending the minimum of two hours I will need to go to the service centre. Any ideas anyone?
	() Thanks

20th December 2008, 08:26	#2
headers Senior - BHPian Join Date: May 2006 Location: Greater Chennai Posts: 4,667 Thanked: 563 Times	it will happen if you leave the clutch before revving the engine!
	() Thanks

20th December 2008, 11:42	#4
esteem_lover Senior - BHPian Join Date: Jul 2006 Location: Madras/Py Posts: 7,556 Thanked: 513 Times View My Garage	Could be a case of clutch overheating ? Do you ride the clutch ? try to avoid that.
	() Thanks

20th December 2008, 11:45	#5
vikram_d Senior - BHPian Join Date: Jul 2006 Location: Bangalore Posts: 2,422 Thanked: 1,188 Times	Get the clutch play checked. Sounds like the clutch is little loose. Is it a hydraulic clutch by any chance?
	() Thanks

22nd December 2008, 10:02	#7
the_maassk BHPian Join Date: Sep 2008 Location: Vadodara/ NG7 2QP Posts: 205 Thanked: 7 Times View My Garage	Just guessing here - but its possible that your fuel cutoff (closed to open loop, happens when you leave the accelerator) is not sync'ed with the throttle position sensor properly. So, if your foot relaxed on the accelerator for a moment, it would cut the fuel and then it would again take a moment to go into closed loop when you press the accelerator. Gurus can advise. (I may be completely wrong here! - let me know).
	() Thanks

22nd December 2008, 10:56	#10
the_maassk BHPian Join Date: Sep 2008 Location: Vadodara/ NG7 2QP Posts: 205 Thanked: 7 Times View My Garage	I have a ScanGauge II installed on my U-VA. From what it reports - at least on my ride, the system goes into open loop at 3/4 throttle AND every time I release the accelerator, if I am on the move (and using engine braking to slow down; clutch not depressed). If I hit the clutch while I am coasting on momentum, the system goes into a closed loop.
	() Thanks

12th September 2021, 12:42	#11
diytry Newbie Join Date: Dec 2019 Location: bengaluru Posts: 3 Thanked: Once	loss of power while cold startng Hi, Hundai accent petrol 2002 There is a loss of power when cold starting th car. It starts and then keeps spluttering. Pressing accelerator does not rev up engine and it continues to splutter. Occasionally it will rev up and then fall back to spluttering. This phase lasts maybe 5-10 mins (have not timed it) and then engine picks up and drive is normal. Restarting after driving a bit is normal and splutter free. I read another thread about engine intermittent 'drag' but that is different in that the loss of power is after normal running. Is there something about startuip phase that can cause this problem? (Actually is not startup phase since it lasts for 5-10 min). The car will only crawl during this time with the spluttering engine supplying minimal power. Is there anything that needs 'warming up' in a petrol car?
	(1) Thanks

12th September 2021, 15:26	#12
ACe_10 BHPian Join Date: Jun 2021 Location: Bangalore Posts: 37 Thanked: 174 Times	Re: loss of power while cold startng I too have faced the same issue in my alto k10. I never really bothered about it as it is very infrequent - happens on some very cold rainy mornings. The issue is ia very similar to what has been described by op. Pressing the accelerator does not rev up the engine - if you put the car in 1st gear and try to move it, the car stutters and stalls (even if you floor the accelerator pedal). The solution is to keep the car in neutral for around 60-90 seconds, and then it starts behaving normal. Like I said, never really bothered about the issue given it’s barely an inconvenience. But would nonetheless appreciate if anyone can highlight what is the cause for this.
	() Thanks