Palio auto revving

rammkp · 2nd January 2006, 22:48

Hi,

Of late am experiencing a problem with my palio (1.2 nv sport). When I take the car in the morning, within the first 3-5 minutes of driving the engine auto revvs even when i take my foot of the gas pedal. It happens only once. After that everything is fine.

Also the car is sluggish at times. I know this is a universal problem with NV model. Is there anything that can be done to get away with the sluggishness?

Appreciate your help.

Regards
Ram

RX135 · 3rd January 2006, 12:04

Your engine auto-revvs upto what RPM levels? If it happens *only* on cold mornings, then it's normal phenomenon. (Engine RPM going upto 1200 rpm and then falling down to ~800 rpm over a minute or two). If not, it may be an ECU problem. Get it checked.

DCEite · 3rd January 2006, 12:10

Yes the engine Auto revvs in almost all MPFI cars. There is nothing unusual about it Remember the good old carb 800 days when the car does not start in the morning if you dont revv hard?.. MPFI systems are smart. They know that the engine is cold and needs revving. So it auto revvs.

As for the sluggishness, i have heard many people complain this about NV model. This is partly due to the fact that the NV model was a more "Fuel efficiency" tweaked model at the cost of performance. There is a lot of detail that goes into that, i dont think i would able to explain it here.

cya

tsxei · 3rd January 2006, 22:37

Auto-revving on cold starts is normal like RX135 and dceite say. The engine rpm should drop to the idle speed when the ECU thinks that the engine is warmed up enough. I always let the rpms drop down to "idle" before pushing off. I also try not to rev hard for the first 10 minutes or so of driving from a cold start. Everything is rough and feels crude when it is cold. If you have a manual transmission car you might even feel that your shifts are not smooth. Give the car a few minutes to warm up and everything will be fine.

air870 · 30th March 2006, 21:16

faced this auto reving myself but arbid not only on cold starts. turned out to be crud/build p in the throttle body idle valve unit. fortunatly solved with a couple of applications of carb cleaner spray.

zulfikar · 31st March 2006, 08:25

It happenes the same on my Optra...
it happenes on all MPFI cars i even say it happen on M800 Mpfi...
so it's normal...

2nd January 2006, 22:48	#1
rammkp Newbie Join Date: Dec 2005 Location: Chennai Posts: 9 Thanked: 0 Times	Palio auto revving Hi, Of late am experiencing a problem with my palio (1.2 nv sport). When I take the car in the morning, within the first 3-5 minutes of driving the engine auto revvs even when i take my foot of the gas pedal. It happens only once. After that everything is fine. Also the car is sluggish at times. I know this is a universal problem with NV model. Is there anything that can be done to get away with the sluggishness? Appreciate your help. Regards Ram
	() Thanks

3rd January 2006, 12:04	#2
RX135 Senior - BHPian Join Date: Dec 2004 Location: pune Posts: 2,106 Thanked: 75 Times	Your engine auto-revvs upto what RPM levels? If it happens only on cold mornings, then it's normal phenomenon. (Engine RPM going upto 1200 rpm and then falling down to ~800 rpm over a minute or two). If not, it may be an ECU problem. Get it checked.
	() Thanks

3rd January 2006, 12:10	#3
DCEite Senior - BHPian Join Date: Sep 2004 Location: NCR Posts: 3,417 Thanked: 2,551 Times	Yes the engine Auto revvs in almost all MPFI cars. There is nothing unusual about it Remember the good old carb 800 days when the car does not start in the morning if you dont revv hard?.. MPFI systems are smart. They know that the engine is cold and needs revving. So it auto revvs. As for the sluggishness, i have heard many people complain this about NV model. This is partly due to the fact that the NV model was a more "Fuel efficiency" tweaked model at the cost of performance. There is a lot of detail that goes into that, i dont think i would able to explain it here. cya
	() Thanks

3rd January 2006, 22:37	#4
tsxei BHPian Join Date: Nov 2005 Location: Coimbatore Posts: 164 Thanked: 0 Times View My Garage	Auto-revving on cold starts is normal like RX135 and dceite say. The engine rpm should drop to the idle speed when the ECU thinks that the engine is warmed up enough. I always let the rpms drop down to "idle" before pushing off. I also try not to rev hard for the first 10 minutes or so of driving from a cold start. Everything is rough and feels crude when it is cold. If you have a manual transmission car you might even feel that your shifts are not smooth. Give the car a few minutes to warm up and everything will be fine.
	() Thanks

30th March 2006, 21:16	#5
air870 BHPian Join Date: Feb 2005 Location: mumbai Posts: 66 Thanked: 2 Times	faced this auto reving myself but arbid not only on cold starts. turned out to be crud/build p in the throttle body idle valve unit. fortunatly solved with a couple of applications of carb cleaner spray.
	() Thanks

31st March 2006, 08:25	#6
zulfikar BHPian Join Date: Feb 2005 Location: Hyderabad Posts: 532 Thanked: 18 Times View My Garage	It happenes the same on my Optra... it happenes on all MPFI cars i even say it happen on M800 Mpfi... so it's normal...
	() Thanks